US20080258109A1 - White light emitting diode component having two phosphors and related phosphor and formation method - Google Patents

White light emitting diode component having two phosphors and related phosphor and formation method Download PDF

Info

Publication number
US20080258109A1
US20080258109A1 US12/143,851 US14385108A US2008258109A1 US 20080258109 A1 US20080258109 A1 US 20080258109A1 US 14385108 A US14385108 A US 14385108A US 2008258109 A1 US2008258109 A1 US 2008258109A1
Authority
US
United States
Prior art keywords
phosphor
light
emission
led
white light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/143,851
Inventor
Chia-Cheng Kang
Ru-Shi Liu
Hung-Yuan Su
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lite On Technology Corp
Original Assignee
Lite On Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lite On Technology Corp filed Critical Lite On Technology Corp
Priority to US12/143,851 priority Critical patent/US20080258109A1/en
Assigned to LITE-ON TECHNOLOGY CORP. reassignment LITE-ON TECHNOLOGY CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANG, CHIA-CHENG, LIU, RU-SHI, SU, HUNG-YUAN
Publication of US20080258109A1 publication Critical patent/US20080258109A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • C09K11/881—Chalcogenides
    • C09K11/886—Chalcogenides with rare earth metals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7774—Aluminates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • H01L33/504—Elements with two or more wavelength conversion materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a light-emitting diode (LED), and more particularly, to a white light LED component having a single LED chip and two kinds of phosphor.
  • LED light-emitting diode
  • An easy method for making a W-LED component is to combine a blue light LED chip capable of emitting blue light and a red light LED chip capable of emitting red light with a green light LED chip capable of emitting green light to form the W-LED component.
  • the W-LED component is therefore capable of emitting white light, which is formed by mixing the blue light, the red light, and the green light.
  • the above three-in-one W-LED component is expensive, for it has to include three LED chips. Moreover, since the three LED chips each have a light-emitting efficiency different from one-another (The light-emitting efficiency of the blue LED chip is higher than the light-emitting efficiency of the red/green LED chip. ), the white light emitted by the W-LED component, which is composed of the three LED chips, has a low CRI.
  • Nichia Chemical Co. disclosed a W-LED component consisting of a single LED chip and phosphor having a chemical formula of (Y 1 ⁇ p ⁇ q ⁇ r Gd p Ce q Sm r ) 3 (Al 1 ⁇ s Ga s ) 5 O 12 where p is between 0-0.8, q is between 0.003-0.2, r is between 0.0003-0.08, and s is between 0-1.
  • the single LED chip is capable of emitting luminescent light.
  • the phosphor is doped into epoxy resin used to cover the single LED chip. It is capable of absorbing luminescent light with predetermined wavelength, such as the luminescent light emitted by the single LED chip, and emitting an emission. As a result, the luminescent light emitted by the single LED chip, except the predetermined luminescent light, combines with the emission emitted by the phosphor to form white light.
  • the W-LED component disclosed by Nichia Chemical Co. comprises nothing but the single LED chip and photoluminescence phosphor; it is a mature and cheap product.
  • the prior art's W-LED component comprises another red phosphor CaS:Eu.
  • the red phosphor CaS:Eu which comprises an S-compound, lacks of stability.
  • the red phosphor CaS:Eu decomposes easily in humid and high temperature environments.
  • a W-LED component having unstable red phosphor CaS:Eu has a poor CRI and a short lifespan.
  • the primary purpose of the claimed invention is, therefore, to provide a white light emitting diode component and related phosphor formation method.
  • the W-LED component includes a light-emitting chip for emitting luminescent light; a first phosphor for absorbing first luminescent light of the luminescent light and emitting first emission, the first luminescent light having a first wavelength different from that of the first emission, the first phosphor having a first chemical formula of (Ca 1 ⁇ x ⁇ y Eu x M y )Se where x is not equal to zero, y is between zero and one, and M comprises one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn; and a second phosphor for absorbing second luminescent light of the luminescent light and emitting second emission, the second luminescent light having a second wavelength different from that of the second emission, the second phosphor having a second chemical formula of (Lu x Q y Ce z )Al 5 O 12 where x+y+z is equal to three, z is between zero and 0.5, and Q comprises one element selected from a second group consisting of T
  • the formation method includes providing CaCO 3 , Eu 2 O 3 , and Se powder; grinding and blending CaCO 3 , Eu 2 O 3 , Se powder, and reactants comprising one element selected from a group consisting of Be, Mg, Sr, Ba, and Zn; placing the ground and blended CaCO 3 , Eu 2 O 3 , and Se powder in a reduction atmosphere; heating the ground and blended CaCO 3 , Eu 2 O 3 , and Se powder in the reduction atmosphere at a predetermined rate of temperature increase to a predetermined temperature, and performing a reduction sintering process for a predetermined period of time in order to form a chemical compound; cooling the chemical compound at a predetermined rate of temperature decrease to room temperature, and forming phosphor having a chemical formula of (Ca 1 ⁇ x ⁇ y Eu x M y )Se where x is not equal to zero, y is between zero and one, and M comprises one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn.
  • FIG. 1 is a schematic diagram of a W-LED component of the preferred embodiment according to the present invention.
  • FIG. 2 is a spectrum diagram of the first emission L PHO1 as well as a first excitation L EX1 capable of exciting the first phosphor 18 to emit the first emission L PHO1.
  • FIG. 3 is a spectral diagram of the second emission L PHO2 as well as a second excitation L EX2 capable of causing the second phosphor 20 to emit the second emission L PHO2 .
  • FIG. 4 is a spectral diagram of the white light L WH emitted by the component 10 , where an abscissa represents the wavelength of the white light L WH , and an ordinate represents the relative intensity of the white light L WH.
  • FIG. 5 is a CIE chromaticity diagram of CIE chromaticity corresponding to light in the W-LED component shown in FIG. l.
  • FIG. 1 is a schematic diagram of a W-LED component 10 of the preferred embodiment according to the present invention.
  • the component 10 comprises a cup-shaped housing 12 , an LED chip 14 installed on a bottom part of the housing 12 for emitting luminescent light L LED , epoxy resin 16 filling the housing 12 for covering the LED chip 14 , and first and second phosphors 18 and 20 , both of which are doped into the epoxy resin 16 for absorbing first and second luminescent light L LED1 and L LED2 of the luminescent light L LED emitted by the LED chip 14 and emitting first and second emission L PHO1 and L PHO2 .
  • the first emission L PHO1 has a wavelength different from the first luminescent light L LED1 .
  • the second emission L PHO2 has a wavelength different from the second luminescent light L LED2 .
  • the component 10 emits the white light L WH , which is a mixing of the luminescent light L LED (except for the first and the second luminescent light L LED1 and L LED2 ), the first emission L PHO1 emitted by the first phosphor 18 , and the second emission L PHO2 emitted by the second phosphor 20 .
  • FIG. 2 is a spectrum diagram of the first emission L PHO1 as well as a first excitation L EX1 capable of exciting the first phosphor 18 to emit the first emission L PHO1 , wherein an abscissa represents wavelengths of the first emission L PHO1 and the first excitation L EX1 , an ordinate represents relative intensity of the first emission L PHO1 and the first excitation L EX1 .
  • the first excitation L EX1 has a dominant wavelength equal to that of the luminescent light L LED emitted by the LED chip 14 , and the x and the y in the chemical formula of the first phosphor 18 are equal to 0.005 and 0 respectively.
  • FIG. 2 is a spectrum diagram of the first emission L PHO1 as well as a first excitation L EX1 capable of exciting the first phosphor 18 to emit the first emission L PHO1 , wherein an abscissa represents wavelengths of the first emission L PHO1 and the first excitation L EX1 , an ordinate
  • FIG. 3 is a spectral diagram of the second emission L PHO2 as well as a second excitation L EX2 capable of causing the second phosphor 20 to emit the second emission L PHO2 .
  • An abscissa represents wavelengths of the second emission L PHO2 and the second excitation L EX2
  • an ordinate represents relative intensity of the second emission L PHO2 and the second excitation L EX2 .
  • the second excitation L EX2 has a dominant wavelength equal to that of the luminescent light L LED emitted by the LED chip 14 .
  • FIG. 4 is a spectral diagram of the white light L WH emitted by the component 10 , where an abscissa represents the wavelength of the white light L WH , and an ordinate represents the relative intensity of the white light L WH .
  • the component 10 comprises two kinds of phosphor, adjusting the relative intensity of the luminescent light L LED , the first emission L PHO1 , and the second emission L PHO2 can yield a variety of shades of white light, such as a white light L WH1 indicated by dashed lines which has a color temperature of 6182K, or a white light L WH2 which is indicated by solid lines and has a color temperature of 2714K.
  • Step 106 Grind and blend CaCO 3 , Eu 2 O 3 , and Se powder;
  • Step 110 Twelve hours later, cool the compound formed in step 108 to room temperature at ⁇ 5° C./second to obtain the first phosphor 18 ;

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Luminescent Compositions (AREA)
  • Led Device Packages (AREA)

Abstract

A white light emitting diode component capable of emitting white light includes an LED chip capable of emitting luminescent light, a first phosphor for absorbing first luminescent light of the luminescent light and emitting first emission, and a second phosphor for absorbing second luminescent light of the luminescent light and emitting second emission. A blend of the luminescent light (except for the first and the second luminescent light) and the first and the second emissions forms the white light. The first phosphor has a chemical formula of (Ca1−x−yEuxMy)Se, where x is not equal to zero, y is between zero and one, and M is composed of at least one element selected from a group consisting of Be, Mg, Sr, Ba, and Zn.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application is a division of U.S. application Ser. No. 11/162,908 filed Sep. 28, 2005, the contents of which are hereby incorporated by reference.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a light-emitting diode (LED), and more particularly, to a white light LED component having a single LED chip and two kinds of phosphor.
  • 2. Description of the Prior Art
  • Having the advantages of low power consumption, long lifespan (about ten times as long as that of an incandescent lamp), and, most importantly, high color rendering index (CRI) such that a white light LED (W-LED) component is capable of generating visible radiation that will not damage art, it has become one of the most popular illuminating devices in a competitive market demanding a high CRI.
  • An easy method for making a W-LED component is to combine a blue light LED chip capable of emitting blue light and a red light LED chip capable of emitting red light with a green light LED chip capable of emitting green light to form the W-LED component. The W-LED component is therefore capable of emitting white light, which is formed by mixing the blue light, the red light, and the green light.
  • However, the above three-in-one W-LED component is expensive, for it has to include three LED chips. Moreover, since the three LED chips each have a light-emitting efficiency different from one-another (The light-emitting efficiency of the blue LED chip is higher than the light-emitting efficiency of the red/green LED chip. ), the white light emitted by the W-LED component, which is composed of the three LED chips, has a low CRI.
  • In order to overcome the above drawbacks, Nichia Chemical Co. disclosed a W-LED component consisting of a single LED chip and phosphor having a chemical formula of (Y1−p−q−rGdpCeqSmr)3(Al1−sGas)5O12 where p is between 0-0.8, q is between 0.003-0.2, r is between 0.0003-0.08, and s is between 0-1. The single LED chip is capable of emitting luminescent light. The phosphor is doped into epoxy resin used to cover the single LED chip. It is capable of absorbing luminescent light with predetermined wavelength, such as the luminescent light emitted by the single LED chip, and emitting an emission. As a result, the luminescent light emitted by the single LED chip, except the predetermined luminescent light, combines with the emission emitted by the phosphor to form white light.
  • The W-LED component disclosed by Nichia Chemical Co. comprises nothing but the single LED chip and photoluminescence phosphor; it is a mature and cheap product.
  • However, in addition to the phosphor having the chemical formula of (Y1−p−q−rGdpCeqSmr)3(Al1−sGas)5O12, a variety of phosphors can be used to be combined with the single LED chip to form a W-LED.
  • Moreover, in order to improve CRI, the prior art's W-LED component comprises another red phosphor CaS:Eu. The red phosphor CaS:Eu, which comprises an S-compound, lacks of stability. For example, the red phosphor CaS:Eu decomposes easily in humid and high temperature environments. As a result, a W-LED component having unstable red phosphor CaS:Eu has a poor CRI and a short lifespan.
    • SUMMARY OF THE INVENTION
  • The primary purpose of the claimed invention is, therefore, to provide a white light emitting diode component and related phosphor formation method.
  • The W-LED component includes a light-emitting chip for emitting luminescent light; a first phosphor for absorbing first luminescent light of the luminescent light and emitting first emission, the first luminescent light having a first wavelength different from that of the first emission, the first phosphor having a first chemical formula of (Ca1−x−yEuxMy)Se where x is not equal to zero, y is between zero and one, and M comprises one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn; and a second phosphor for absorbing second luminescent light of the luminescent light and emitting second emission, the second luminescent light having a second wavelength different from that of the second emission, the second phosphor having a second chemical formula of (LuxQyCez)Al5O12 where x+y+z is equal to three, z is between zero and 0.5, and Q comprises one element selected from a second group consisting of Tb, Y and Yb, wherein a mixing of the luminescent light (excluding the first and the second luminescent light emitted by the light-emitting chip), the first emission and the second emission forms white light.
  • The formation method includes providing CaCO3, Eu2O3, and Se powder; grinding and blending CaCO3, Eu2O3, Se powder, and reactants comprising one element selected from a group consisting of Be, Mg, Sr, Ba, and Zn; placing the ground and blended CaCO3, Eu2O3, and Se powder in a reduction atmosphere; heating the ground and blended CaCO3, Eu2O3, and Se powder in the reduction atmosphere at a predetermined rate of temperature increase to a predetermined temperature, and performing a reduction sintering process for a predetermined period of time in order to form a chemical compound; cooling the chemical compound at a predetermined rate of temperature decrease to room temperature, and forming phosphor having a chemical formula of (Ca1−x−yEuxMy)Se where x is not equal to zero, y is between zero and one, and M comprises one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn.
  • These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic diagram of a W-LED component of the preferred embodiment according to the present invention.
  • FIG. 2 is a spectrum diagram of the first emission LPHO1 as well as a first excitation LEX1 capable of exciting the first phosphor 18 to emit the first emission LPHO1.
  • FIG. 3 is a spectral diagram of the second emission LPHO2 as well as a second excitation LEX2 capable of causing the second phosphor 20 to emit the second emission LPHO2.
  • FIG. 4 is a spectral diagram of the white light LWH emitted by the component 10, where an abscissa represents the wavelength of the white light LWH, and an ordinate represents the relative intensity of the white light LWH.
  • FIG. 5 is a CIE chromaticity diagram of CIE chromaticity corresponding to light in the W-LED component shown in FIG. l.
  • FIG. 6 is a flow chart of a formation method according to the present invention.
    •  DETAILED DESCRIPTION
  • Please refer to FIG. 1, which is a schematic diagram of a W-LED component 10 of the preferred embodiment according to the present invention. The component 10 comprises a cup-shaped housing 12, an LED chip 14 installed on a bottom part of the housing 12 for emitting luminescent light LLED, epoxy resin 16 filling the housing 12 for covering the LED chip 14, and first and second phosphors 18 and 20, both of which are doped into the epoxy resin 16 for absorbing first and second luminescent light LLED1 and LLED2 of the luminescent light LLED emitted by the LED chip 14 and emitting first and second emission LPHO1 and LPHO2. The first emission LPHO1 has a wavelength different from the first luminescent light LLED1. The second emission LPHO2 has a wavelength different from the second luminescent light LLED2.
  • According to the present invention, the luminescent light LLED emitted by the LED chip 14 has a dominant wavelength of between 380 and 480 nanometers. That is, the luminescent light LLED emitted by the LED chip 14 is between indigo and blue. The first phosphor 18 has a chemical formula of (Ca1−x−yEuxMy)Se, where x is not equal to zero, y is between zero and one, and M is composed of at least one element selected from a group consisting of Be, Mg, Sr, Ba, and Zn. The first phosphor 18 absorbs the first indigo (or blue) light LLED1, and emits the first emission LPHO1, which is orange. The CaSe acts as a first host of the first phosphor 18. Eu, as well as M, act as first foreign ions doped into the first host, and can be incorporated into the first host to form a first activator capable of emitting the first emission LPHO1. The second phosphor 20 has a chemical formula of (LuxQyCez)Al5O12, where x+y+z is equal to three, z is between zero and 0.5, and Q is composed of at least one element selected from a second group consisting of Tb, Y and Yb. Similarly, the second phosphor 20 absorbs the second indigo (or blue) light LLED2, and emits the second emission LPHO2, which is yellow-green. The LuxAl5O12 acts as a second host of the second phosphor 20. The Q as well as the Ce act as second foreign ions doped into the second host, and can be incorporated into the second host to form a second activator capable of emitting the second emission LPHO2.
  • As a result, the component 10 emits the white light LWH, which is a mixing of the luminescent light LLED (except for the first and the second luminescent light LLED1 and LLED2), the first emission LPHO1 emitted by the first phosphor 18, and the second emission LPHO2 emitted by the second phosphor 20.
  • To improve the CRI and uniformity of the white light LWH emitted by the component 10, the first phosphor 18 and the second phosphor 20 have a particle diameter smaller than 20 micrometers and an average particle diameter equal to about five micrometers.
  • Please refer to FIGS. 2-5. FIG. 2 is a spectrum diagram of the first emission LPHO1 as well as a first excitation LEX1 capable of exciting the first phosphor 18 to emit the first emission LPHO1, wherein an abscissa represents wavelengths of the first emission LPHO1 and the first excitation LEX1, an ordinate represents relative intensity of the first emission LPHO1 and the first excitation LEX1. The first excitation LEX1 has a dominant wavelength equal to that of the luminescent light LLED emitted by the LED chip 14, and the x and the y in the chemical formula of the first phosphor 18 are equal to 0.005 and 0 respectively. FIG. 3 is a spectral diagram of the second emission LPHO2 as well as a second excitation LEX2 capable of causing the second phosphor 20 to emit the second emission LPHO2. An abscissa represents wavelengths of the second emission LPHO2 and the second excitation LEX2, an ordinate represents relative intensity of the second emission LPHO2 and the second excitation LEX2. The second excitation LEX2 has a dominant wavelength equal to that of the luminescent light LLED emitted by the LED chip 14. FIG. 4 is a spectral diagram of the white light LWH emitted by the component 10, where an abscissa represents the wavelength of the white light LWH, and an ordinate represents the relative intensity of the white light LWH. Because the component 10 comprises two kinds of phosphor, adjusting the relative intensity of the luminescent light LLED, the first emission LPHO1, and the second emission LPHO2 can yield a variety of shades of white light, such as a white light LWH1 indicated by dashed lines which has a color temperature of 6182K, or a white light LWH2 which is indicated by solid lines and has a color temperature of 2714K. FIG. 5 is a CIE chromaticity diagram of CIE chromaticity coordinates corresponding to the luminescent light LLED, the first emission LPHO1, the second emission LPHO2, the white light LWH2 having the color temperature of 2714K, the white light LWH1 having the color temperature of 6182K, and an ideal white light LWH0, where an abscissa represents an x-chromaticity coordinate, an ordinate represents a y-chromaticity coordinate, and A(0.1252, 0.0991), B(0.3370, 0.5698), C(0.6154, 0.3790), D(0.4603, 0.4133), E(0.3191, 0.3262), and F(0.31, 0.32) represent six chromaticity points respectively corresponding to the luminescent light LLED having a wavelength equal to 470 nanometers, the first emission LPHO1 excited by the luminescent light LLED1 and having a wavelength equal to 470 nanometers, the second emission LPHO2 excited by the luminescent light LLED2 and having a wavelength equal to 470 nanometers, the white light LWH2 having the color temperature of 2714K, formed through a blending of the first and the second emissions LPHO1 and LPHO2 and the luminescent light LLED, and, the white light LWH1 having the color temperature of 6182K, formed also through a blending of the first and the second emission LPHO1 and LPHO2 and the luminescent light LLED, and the genuine white light LWH0.
  • According to the preferred embodiment, the first phosphor 18 is formed through a solid-state method, a co-precipitation method, a micro-emulsion method, or a gel method.
  • These methods have advantages, and disadvantages as well. For example, the co-precipitation method is complicated, but has a short reaction period. It is also is capable of generating small and well-mixed first phosphor 18. The first phosphor, if formed through the micro-emulsion method, has a specific surface area larger than that of phosphor formed through the conventional co-precipitation method.
  • A formation method 100 of the first phosphor 18 is described as follows. Please refer to FIG. 6, which is a flow chart of the formation method 100 according to the present invention. The method 100 comprises the following steps:
  • Step 102: Start;
  • Step 104: Provide CaCO3, Eu2O3, reactants comprising at least one element selected from a group consisting of Be, Mg, Sr, Ba, and Zn (such as SrO), and Se powder according to a predetermined stoichiometric ratio;
  • Step 106: Grind and blend CaCO3, Eu2O3, and Se powder;
  • Step 108: Place the ground and blended CaCO3, Eu2O3, and Se powder in a reduction atmosphere comprising H2/N2 (5%/95%), heat the ground and blended CaCO3, Eu2O3, and Se powder in the reduction atmosphere at a predetermined rate of temperature increase of +5° C./second up to a predetermined temperature of 1200° C., and perform a reduction sintering process for a predetermined period of four hours to form a chemical compound;
  • (The reduction sintering process reduces Eu3+ ions of the blended CaCO3, Eu2O3, and Se powder into Eu2+ ions, so as to promote the light intensity of the first phosphor 18. The predetermined temperature of the reduction sintering process is between 1000° C. and 1600° C. The predetermined time period of the reduction sintering process is between three and 24 hours. The reduction atmosphere comprises hydrogen and nitrogen gas, or hydrogen and argon gas.);
  • Step 110: Twelve hours later, cool the compound formed in step 108 to room temperature at −5° C./second to obtain the first phosphor 18; and
  • Step 112: End.
  • In contrast to the prior art, the present invention can provide a W-LED component having first and second phosphors 18 and 20, and an LED chip 14 for emitting luminescent light. The first and the second phosphor 18 and 20 absorb first and second luminescent light LLED1 and LLED2 and emit first and second emissions LPHO1 and LPHO2 respectively. The first emission LPHO1 has a wavelength different from that of the first luminescent light LLED1. The second emission LLPHO2 has a wavelength different from that of the second luminescent light LLED2. The luminescent light LLED, except the first and second luminescent lights LLED1 and LLED2 emitted by the LED chip combines with the first emission LPHO1 and the second emission LPHO2 to form white light. The first phosphor 18 has a first chemical formula of (Ca1−x−yEuxMy)Se where x is not equal to zero, y is between zero and one, and M is composed of at least one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn. The second phosphor 20 has a second chemical formula of (LuxQyCez)Al5O12 where x+y+z is equal to three, z is between zero and 0.5, and Q is composed of at least one element selected from a second group consisting of Tb, Y and Yb. The incorporation of the first and the second phosphor 18 and 20 replaces the red and the green LED chips in the prior art's three-in-one W-LED component, thus reducing the cost of the W-LED component, and increasing the CRI of the W-LED component. Moreover, the first phosphor 18, which has the chemical formula (Ca1−x−yEuxMy)Se, is stable. Even when placed in a humid and high temperature environment, the first phosphor 18 will not decompose. Lastly, the first phosphor 18, after being excited by luminescent light, has a light intensity stronger than that of the red phosphor CaS:Eu. In conclusion, The first phosphor is more suitable to be applied to a W-LED component than the red phosphor CaS:Eu.
  • Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims (5)

1. A phosphor having a chemical formula of (Ca1−x−yEuxMy)Se where x is not equal to zero, y is between zero and one, and M comprises one element selected from a first group consisting of Be, Mg, Sr, Ba, and Zn.
2. The phosphor of claim 1 being formed through the use of a solid state method.
3. The phosphor of claim 1 being formed through the use of a co-precipitation method.
4. The phosphor of claim 1 being formed through the use of a gel method.
5. The phosphor of claim 1 being formed through the use of a micro-emulsion method.
US12/143,851 2005-04-18 2008-06-23 White light emitting diode component having two phosphors and related phosphor and formation method Abandoned US20080258109A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/143,851 US20080258109A1 (en) 2005-04-18 2008-06-23 White light emitting diode component having two phosphors and related phosphor and formation method

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200510065615.3 2005-04-18
CNB2005100656153A CN100403563C (en) 2005-04-18 2005-04-18 LED with white light and fluorescent powder concerned and preparation thereof
US11/162,908 US7420219B2 (en) 2005-04-18 2005-09-28 White light emitting diode component having two phosphors and related phosphor and formation method
US12/143,851 US20080258109A1 (en) 2005-04-18 2008-06-23 White light emitting diode component having two phosphors and related phosphor and formation method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/162,908 Division US7420219B2 (en) 2005-04-18 2005-09-28 White light emitting diode component having two phosphors and related phosphor and formation method

Publications (1)

Publication Number Publication Date
US20080258109A1 true US20080258109A1 (en) 2008-10-23

Family

ID=37107665

Family Applications (3)

Application Number Title Priority Date Filing Date
US11/162,908 Active 2026-02-21 US7420219B2 (en) 2005-04-18 2005-09-28 White light emitting diode component having two phosphors and related phosphor and formation method
US12/142,805 Abandoned US20080247934A1 (en) 2005-04-18 2008-06-20 White light emitting diode component having two phosphors and related phosphor and formation method
US12/143,851 Abandoned US20080258109A1 (en) 2005-04-18 2008-06-23 White light emitting diode component having two phosphors and related phosphor and formation method

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US11/162,908 Active 2026-02-21 US7420219B2 (en) 2005-04-18 2005-09-28 White light emitting diode component having two phosphors and related phosphor and formation method
US12/142,805 Abandoned US20080247934A1 (en) 2005-04-18 2008-06-20 White light emitting diode component having two phosphors and related phosphor and formation method

Country Status (2)

Country Link
US (3) US7420219B2 (en)
CN (1) CN100403563C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100301367A1 (en) * 2009-06-01 2010-12-02 Nitto Denko Corporation Light-emitting device comprising a dome-shaped ceramic phosphor
US20100301739A1 (en) * 2009-06-01 2010-12-02 Nitto Denko Corporation Luminescent ceramic and light-emitting device using the same

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100454591C (en) * 2005-05-10 2009-01-21 光宝科技股份有限公司 LED element containing fluorescent powder, relative fluorescent powder and preparing process thereof
DE102005043623A1 (en) * 2005-09-13 2007-03-15 Schott Ag Production of highly homogeneous low-stress single crystals by drawing, a device for this and the use of such crystals
US7864381B2 (en) 2007-03-20 2011-01-04 Xerox Corporation Document illuminator with LED-driven phosphor
JP2010532104A (en) 2007-06-27 2010-09-30 ザ リージェンツ オブ ザ ユニバーシティ オブ カリフォルニア Optical design for high efficiency white light emitting diodes
DE102008021666A1 (en) * 2008-04-30 2009-11-05 Ledon Lighting Jennersdorf Gmbh Light-emitting device and method for producing a light-emitting device
TWI426629B (en) 2009-10-05 2014-02-11 Everlight Electronics Co Ltd White-light emitting device and preparation method and application of the same
CN102044601B (en) * 2009-10-09 2012-10-03 亿光电子工业股份有限公司 White light emitting device, manufacturing method and application thereof
CN103375708B (en) * 2012-04-26 2015-10-28 展晶科技(深圳)有限公司 Light-emitting diode lamp source device
CN104178171A (en) * 2013-05-23 2014-12-03 海洋王照明科技股份有限公司 Doped calcium selenide up-conversion luminescent fluorescent powder and preparing method thereof
CN111133594B (en) * 2017-09-26 2023-10-10 京瓷株式会社 Light emitting device and lighting device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6635363B1 (en) * 2000-08-21 2003-10-21 General Electric Company Phosphor coating with self-adjusting distance from LED chip
US6670748B2 (en) * 2001-09-25 2003-12-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Illumination unit having at least one LED as light source
US20040188697A1 (en) * 2001-06-29 2004-09-30 Herbert Brunner Surface-mountable radiation-emitting component and method of producing such a component
US20060076883A1 (en) * 2002-10-16 2006-04-13 Hiroto Himaki Oxynitide phosphor and production process thereof, and light-emitting device using oxynitride phosphor
US7119376B1 (en) * 2005-05-10 2006-10-10 Lite-On Technology Corp. Light emitting diode component capable of emitting white lights

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772916A (en) * 1996-10-15 1998-06-30 Liberty Technologies, Inc. Phosphor screen, method of producing the same, and method for preparing a phosphor powder for producing a phosphor screen
JP2004127988A (en) * 2002-09-30 2004-04-22 Toyoda Gosei Co Ltd White light emitting device
EP1554914B1 (en) * 2002-10-14 2006-06-07 Philips Intellectual Property & Standards GmbH Light-emitting device comprising an eu(ii)-activated phosphor
DE10307282A1 (en) * 2003-02-20 2004-09-02 Osram Opto Semiconductors Gmbh Coated phosphor, light-emitting device with such phosphor and method for its production
WO2004099342A1 (en) * 2003-05-12 2004-11-18 Luxpia Co., Ltd. Tb,b-based yellow phosphor, its preparation method, and white semiconductor light emitting device incorporating the same
JP2005019981A (en) * 2003-06-05 2005-01-20 Matsushita Electric Ind Co Ltd Fluorescent material, semiconductor light-emitting element and method of fabricating these
JP2005064189A (en) * 2003-08-11 2005-03-10 Mitsubishi Chemicals Corp Light emitting device, lighting device and image display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6635363B1 (en) * 2000-08-21 2003-10-21 General Electric Company Phosphor coating with self-adjusting distance from LED chip
US20040188697A1 (en) * 2001-06-29 2004-09-30 Herbert Brunner Surface-mountable radiation-emitting component and method of producing such a component
US6670748B2 (en) * 2001-09-25 2003-12-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Illumination unit having at least one LED as light source
US20060076883A1 (en) * 2002-10-16 2006-04-13 Hiroto Himaki Oxynitide phosphor and production process thereof, and light-emitting device using oxynitride phosphor
US7119376B1 (en) * 2005-05-10 2006-10-10 Lite-On Technology Corp. Light emitting diode component capable of emitting white lights

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100301367A1 (en) * 2009-06-01 2010-12-02 Nitto Denko Corporation Light-emitting device comprising a dome-shaped ceramic phosphor
US20100301739A1 (en) * 2009-06-01 2010-12-02 Nitto Denko Corporation Luminescent ceramic and light-emitting device using the same
US8339025B2 (en) * 2009-06-01 2012-12-25 Nitto Denko Corporation Luminescent ceramic and light-emitting device using the same
KR101800345B1 (en) 2009-06-01 2017-11-22 닛토덴코 가부시키가이샤 Luminescent ceramic and light-emitting device using the same

Also Published As

Publication number Publication date
US7420219B2 (en) 2008-09-02
US20060231849A1 (en) 2006-10-19
US20080247934A1 (en) 2008-10-09
CN1855558A (en) 2006-11-01
CN100403563C (en) 2008-07-16

Similar Documents

Publication Publication Date Title
US7420219B2 (en) White light emitting diode component having two phosphors and related phosphor and formation method
US7573189B2 (en) Illumination system comprising a radiation source and a fluorescent material
US6765237B1 (en) White light emitting device based on UV LED and phosphor blend
US7026755B2 (en) Deep red phosphor for general illumination applications
US7094362B2 (en) Garnet phosphor materials having enhanced spectral characteristics
US7906790B2 (en) Full spectrum phosphor blends for white light generation with LED chips
US7274045B2 (en) Borate phosphor materials for use in lighting applications
US7262439B2 (en) Charge compensated nitride phosphors for use in lighting applications
US7573072B2 (en) Phosphor and blends thereof for use in LEDs
JP4932248B2 (en) Yellow light emitting phosphor, white light emitting element using the same, and illumination device using the same
US7753553B2 (en) Illumination system comprising color deficiency compensating luminescent material
US7329371B2 (en) Red phosphor for LED based lighting
US7252787B2 (en) Garnet phosphor materials having enhanced spectral characteristics
US20040124758A1 (en) Luminescene conversion based light emitting diode and phosphors for wave length conversion
US20020158565A1 (en) Phosphor blends for generating white light from near-UV/blue light-emitting devices
US20060022582A1 (en) White LEDs with tunable CRI
EP1908810B1 (en) Phosphor
US7119376B1 (en) Light emitting diode component capable of emitting white lights
KR100672972B1 (en) White diode
KR101047775B1 (en) Phosphor and Light Emitting Device

Legal Events

Date Code Title Description
AS Assignment

Owner name: LITE-ON TECHNOLOGY CORP., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANG, CHIA-CHENG;LIU, RU-SHI;SU, HUNG-YUAN;REEL/FRAME:021132/0955;SIGNING DATES FROM 20050502 TO 20050504

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION