CN102916117A - Multi-peak spectrum LED for improving color-spatial distribution and luminous efficiency and manufacturing method - Google Patents
Multi-peak spectrum LED for improving color-spatial distribution and luminous efficiency and manufacturing method Download PDFInfo
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- CN102916117A CN102916117A CN2012103600357A CN201210360035A CN102916117A CN 102916117 A CN102916117 A CN 102916117A CN 2012103600357 A CN2012103600357 A CN 2012103600357A CN 201210360035 A CN201210360035 A CN 201210360035A CN 102916117 A CN102916117 A CN 102916117A
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Abstract
The invention discloses a multi-peak spectrum LED for improving color-spatial distribution and luminous efficiency and a manufacturing method. The multi-peak spectrum LED is characterized in that a packaging material coating a short-wave visible light chip is mixed with nanoparticles, the nanoparticles are white inert non-luminous materials with the refractive index higher than that of the packaging material and with the thermal conductivity higher than that of the same, the main peak of particle size distribution functions of the nanoparticles is within the range of 3nm-50nm, and the nanoparticles account for 0.01%-0.5%, by weight, of the packaging material coating the short-wave visible light chip. Color-spatial distribution uniformity of the multi-peak spectrum LED is improved, the luminous efficiency of the LED is maintained and even improved, and an LED packaging product excellent in both light performance and color performance is obtained.
Description
Technical field
The present invention relates to a kind of color space that improves distributes and light extraction efficiency multimodal spectrum LED and manufacture method.
Background technology
In recent years, the white light LEDs development speed is swift and violent, and along with the lifting of light efficiency and the decline of price, white light LEDs market more and more is close to domestic lighting and room lighting.The look performance parameters of LED is paid attention to by market gradually simultaneously, and people begin to pursue high aobvious LED, high consistency LED etc.In the face of so challenge, need constantly bringing forth new ideas of LED encapsulation technology.
The main flow packaged type of white light LEDs has 2 kinds: 1) single chips encapsulation; 2) multiple chips module packaging.Chip is divided into horizontal structure and vertical stratification.Because the luminous lambertian distribution that is of blue-light LED chip, especially in 90 ° and-90 ° of directions, radiant flux is extremely low.And the complete shape-preserving coating of the fluorescent material coating method that adopts at present, therefore in the white light colour temperature that usually all can be lower than central angle greater than the white light colour temperature outside the beam angle, this phenomenon is called " halo " phenomenon or " the yellow circle " phenomenon.
The method of eliminating at present this phenomenon has: 1) adopt thin-film LED, fluorescent material shape-preserving coating; 2) adopt spread powder, utilize scattering mechanism to change the light radiation direction; 3) adopt cloudy surface lens, forcibly changing light radiation direction.In above 3 kinds of modes, the first kind of way chip yield is low, and is subject to the amplification of lens, fail to distribute fully evenly, such as the 3000k white light LED color temperature deviation of CREE at ± 100k.In the second way, the spread powder that prior art adopts is mainly submicron particles, poor effect, and adding too much can affect light efficiency.In the third mode, distribution of color is improved same not enough, and affects light efficiency.Therefore need to again seek new method in the LED encapsulation field improves.At present there are research sub-micron or nano particle in each large illumination company to the improvement effect of the color space distributing homogeneity of multimodal spectrum LED, mainly is conceived to the light guide plate of television set and the light guide plate aspect of Panel light.But aspect led light source, be subject to the restriction that the near field excites, the use of spread powder still is among the exploration.About the patent investigation of spread powder to the improvement effect of LED itself, be summarized as follows:
1) US6791259 by add the nano particle encapsulating material layer of 50-500nm between light source and phosphor, obtains the white light LEDs of the high color space distributing homogeneity of high light efficiency;
2) US5618872 by add nano powder in encapsulating material, its objective is the refractive index that improves encapsulating material, thereby improves light efficiency;
3) US20090057699, by add submicron particles in encapsulating material, proportion promotes light efficiency and solves " halo " phenomenon at 0.5%-10%Wt;
4) JP2008520810 is main surface-modified nano particles by add 25nm in encapsulating material, and proportion is promoted to refractive index more than 1.7 at 1%-5%wt, thereby improves light efficiency;
5) US20070295968 by adding the nano particle of 5nm-165nm, improves the uvioresistant performance of electroluminescent device;
6) KR20070069669, by adding the nano particle of 30nm, proportion improves the dispersive property of white light LEDs at 1%-20%wt;
7) EP1864274, by adding organic or inorganic nanoparticles, proportion promotes the LED Photochromic Properties at 3%-30%wt;
8) CN101644403 by add nano TiO 2 in lamp housing, promotes the self-cleaning function of LED lamp housing, increases transmitance.
In the above patent, only 1), 3) and 6) relate to the impact that spread powder distributes on color space, and the spread powder that adopts shared weight percent in encapsulating material is higher, is difficult for obtaining fine dispersion, simultaneously, the spread powder particle diameter is larger, and is bad with the encapsulating material compatibility.In addition, the characteristic description to spread powder in the above-mentioned patent is too wide in range, and spread powder is of a great variety, divides adularescent, water white transparency etc. by color.
We study discovery, and it is very obvious to the Rayleigh scattering effect of shortwave light that the particle size distribution function main peak is in the nano particle of 3-50nm.Therefore use the small particle diameter nano particle not only to obtain better color homogeneity, can also reduce interpolation concentration, keep even improved light extraction efficiency.In addition, the nano particle of white, it is especially remarkable to the improvement effect that the color space of multimodal spectrum LED distributes.
Summary of the invention
For the shortcoming of prior art, the purpose of this invention is to provide a kind of multimodal spectrum LED and manufacture method of improving color space distribution and light extraction efficiency.The present invention has improved the color space distributing homogeneity of multimodal spectrum LED, and keeps even improved the LED light extraction efficiency.Obtain a kind of light, all good LED encapsulating products of look performance.
For achieving the above object, technical scheme of the present invention is: a kind of multimodal spectrum LED that improves color space distribution and light extraction efficiency, by in the encapsulating material that coats the shortwave light chip, mixing nano particle, the nano particle that adopts is the non-luminescent material of white, inertia, its refractive index is higher than the refractive index of encapsulating material, its thermal conductivity is higher than the thermal conductivity of encapsulating material, the main peak of the particle size distribution function of nano particle is in 3nm-50nm, accounts for the percentage by weight 0.01%-0.5% of the encapsulating material that covers the shortwave light chip.
Nano particle is carried out surface modification, improve and the mixed organic and inorganic of encapsulating material interface, suppress the reunion of nano particle.
Encapsulating material is the secondary radiation element layer that is mixed with the encapsulating material composition of non-luminous nano granule and luminescent material; Or be the lens element layer that is mixed with the encapsulating material composition of non-luminous nano granule; Secondary radiation element layer and lens element layer can exist simultaneously, and energy individual layer, multilayer are used, and order can be transferred.
The luminescent material that adds encapsulating material is at least the combination of one or more, excites by the shortwave light chip to form multimodal spectrum.Luminescent material refers to the material that can carry out the wavelength conversion of organic fluorescent powder or inorganic fluorescent powder and so on.
Encapsulating material comprises matrix and curing agent, and described non-luminous nano granule is mixed in first in the matrix, after mixing, adds curing agent again and mixes.
Luminescent material added in the encapsulating material before or after adding curing agent, mixed.
Used shortwave light chip is that single chips output excitation energy or multiple chips form module output excitation energy.
Described non-luminescent material is TiO
2, Al
2O
3, SiO
2, ZrO
2, MgO, ZnO, AlN, diamond, BeO etc.
The present invention also provides a kind of manufacture method of improving the multimodal spectrum LED of color space distribution and light extraction efficiency, and it may further comprise the steps:
1) select one or more inertia nano particles, white non luminescent material, its refractive index is higher than the refractive index of encapsulating material, and thermal conductivity is higher than the thermal conductivity of encapsulating material, and the main peak of its particle size distribution function is in 3-50nm;
2) above-mentioned nano particle is carried out surface modification treatment, suppress the reunion of nano particle, improve with the interface of organic peak value material compatible;
3) nano particle with modification mixes encapsulating material, and high-speed stirred is to even, and the nano particle weight that it mixes accounts for encapsulating material total weight percent 0.01%-0.5%;
4) add curing agent, high-speed stirred;
5) mix luminescent material, luminescent material is one or more, high-speed stirred;
6) vacuum defoamation;
7) use dispensing technology to be made into the secondary radiation element layer; Or carry out step 1), 2), 3), 4), 6), use dispensing technology or mould molding fabrication techniques to become the lens element layer.
Secondary radiation element layer described in the step 7) and lens element layer can use by single or multiple lift, and order can be transferred when multilayer was used.
Principle of the present invention is: nano particle has strong Rayleigh scattering effect to shortwave light, the biquadratic of Rayleigh scattering luminous intensity and incident light wavelength is inversely proportional to, square be directly proportional with the volume of particle, be directly proportional with population in the unit volume colloid, and it is larger that the refractive index of decentralized photo and decentralized medium differs, and the scattered light of particle is stronger.Utilize nano particle to the strong Rayleigh scattering effect of shortwave light, increase shortwave light to the probability of side-scattered, increase propagation path; With the compensation side because visible radiation is subject to the Mie scattering process of luminescent material and the excessively low deficiency of radiant flux, increase the probability of shortwave light excitation light-emitting material, therefore realize the purpose of the working concentration of reduction luminescent material, increased simultaneously the transmitance of luminescent material.Final purpose has been improved the color space distributing homogeneity of multimodal spectrum LED, and keeps even improved the LED light extraction efficiency.Obtain a kind of light, all good LED encapsulating products of look performance.
Description of drawings
Fig. 1 is the side-looking section of structure of the invention process example one;
Fig. 2 is the side-looking section of structure of the invention process example two;
Fig. 3 is the side-looking section of structure of the invention process example three;
Fig. 4 is the invention process example one, two, three and do not add the color space distributing homogeneity test result comparison diagram of nano particle LED;
Fig. 5 is the side-looking section of structure of the invention process example four.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
As shown in Figure 1, be the embodiment that the present invention improves the multimodal spectrum LED of color space distribution and light extraction efficiency, by matrix 1, shortwave light led chip 2, secondary radiation element layer 3.Secondary radiation element layer 3 is for being mixed with the encapsulating material of non-luminous nano granule and luminescent material.
The peak wavelength of shortwave light led chip 2 is chosen in 385nm-550nm, and the best is 440nm-470nm.Size is not limit.
Secondary radiation element layer 3 comprises a certain amount of inorganic or luminous organic material that can be excited by shortwave light led chip 2, comprises the nano particle of 0.01%-0.5%, comprises for the encapsulating material that mixes 2 kinds of particles.
Secondary radiation element layer 3 is coated on the shortwave light led chip 2, and skin can be selected lens protection or exposed.Encapsulating the concrete outward appearance form of expression not limited by the present invention.
In the present embodiment, the comparative sample data of employing are the same white light LEDs that does not mix nano particle, and colour temperature is 3000k, A curve among spatial color distribution data such as Fig. 4, and 90 ° of color temperature distribution deviations to-90 ° of scopes are ± 80k.And the sample colour temperature of making by example one is 3000k, B curve among spatial color distribution data such as Fig. 4, and the color temperature distribution deviation is ± 40k.Wherein light extraction efficiency does not reduce.
As shown in Figure 2, be another exemplifying embodiment that the present invention improves the multimodal spectrum LED of color space distribution and light extraction efficiency, formed by matrix 1, shortwave light led chip 2, secondary radiation element layer 5, lens element layer 6.Lens element layer 6 is for being mixed with the encapsulating material of non-luminous nano granule.
The peak wavelength of shortwave light led chip 2 is chosen in 385nm-550nm, and the best is 440nm-470nm.Size is not limit.
Secondary radiation element layer 5 comprises a certain amount of inorganic or luminous organic material that can be excited by shortwave light led chip 2, comprises for the encapsulating material that disperses luminescent material.
Secondary radiation element layer 5 is coated on the shortwave light led chip 2, lens element layer 6 parcel shortwave light led chip 2 and secondary radiation element layer 5.Encapsulating the concrete outward appearance form of expression not limited by the present invention.
In the present embodiment, the comparative sample data of employing are the same white light LEDs that does not mix nano particle, and colour temperature is 3000k, A curve among spatial color distribution data such as Fig. 4, and 90 ° of color temperature distribution deviations to-90 ° of scopes are ± 80k.And the sample colour temperature of making by example one is 3000k, C curve among spatial color distribution data such as Fig. 4, and the color temperature distribution deviation is ± 10k.Wherein light extraction efficiency does not reduce.
As shown in Figure 3, be the 3rd embodiment that the present invention improves the multimodal spectrum LED of color space distribution and light extraction efficiency, formed by matrix 1, shortwave light led chip 2, secondary radiation element layer 7, lens element layer 8.
The peak wavelength of short-wavelength visible light led chip 2 is chosen in 385nm-550nm, and the best is 440nm-470nm.Size is not limit.
Secondary radiation element layer 7 comprises a certain amount of inorganic or luminous organic material that can be excited by short-wavelength visible light led chip 2, comprises the nano particle of 0.01%-0.5%, comprises for the encapsulating material that mixes 2 kinds of particles.
Lens element layer 8 comprises and is applicable to the required encapsulating material of LED bright dipping, such as silica gel and epoxy resin, also comprises the nano particle of 0.01%-0.5%, by dispersed with stirring in encapsulating material.
Secondary radiation element layer 7 is coated on the short-wavelength visible light led chip 2, and lens element layer 8 parcel short-wavelength visible light led chip 2 and the concrete outward appearance form of expression of luminescent material mixed layer 7. encapsulation are not limited by the present invention.
In the present embodiment, the comparative sample data of employing are the same white light LEDs that does not mix nano particle, and colour temperature is 3000k, A curve among spatial color distribution data such as Fig. 4, and 90 ° of color temperature distribution deviations to-90 ° of scopes are ± 80k.And the sample colour temperature of making by example one is 3000k, D curve among spatial color distribution data such as Fig. 4, and the color temperature distribution deviation is ± 0k.Wherein light extraction efficiency does not reduce.
Embodiment 4
As shown in Figure 5, be the 4th embodiment that the present invention improves the multimodal spectrum LED of color space distribution and light extraction efficiency, formed by matrix 1, many shortwave light led chips 2, secondary radiation element layer 9, lens element layers 10.
The peak wavelength of short-wavelength visible light led chip 2 is chosen in 385nm-550nm, and the best is 440nm-470nm.Size is not limit.
Secondary radiation element layer 9 comprises a certain amount of inorganic or luminous organic material that can be excited by short-wavelength visible light led chip 2, can comprise the nano particle of 0.01%-0.5%, comprises for the encapsulating material that mixes 2 kinds of particles.
Above element layer 9,10 has 1 nano particle that comprises 0.01%-0.5% at least, by dispersed with stirring in encapsulating material.
Secondary radiation element layer 9 is coated on the short-wavelength visible light led chip 2, can select lens element layer 10 parcel short-wavelength visible light led chip 2 and the concrete outward appearance form of expression of luminescent material mixed layer 9. encapsulation not limited by the present invention.
In the example of the present invention, the kind of the luminescent material of luminous material layer has at least a kind of.Example is only illustrated, does not make the concrete shape regulation.
Claims (10)
1. one kind is improved color space distribution and light extraction efficiency multimodal spectrum LED, it is characterized in that: by in the encapsulating material that coats the shortwave light chip, mixing nano particle, the nano particle that adopts is the non-luminescent material of white, inertia, its refractive index is higher than the refractive index of encapsulating material, its thermal conductivity is higher than the thermal conductivity of encapsulating material, the main peak of the particle size distribution function of nano particle is in 3nm-50nm, accounts for the percentage by weight 0.01%-0.5% of the encapsulating material that covers the shortwave light chip.
2. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, nano particle is carried out surface modification, improves and the mixed organic and inorganic of encapsulating material interface, suppresses the reunion of nano particle.
3. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, encapsulating material is the secondary radiation element layer that is mixed with non-luminous nano granule and luminescent material; Or for being mixed with the lens element layer of non-luminous nano granule; Secondary radiation element layer and lens element layer can exist simultaneously, and energy individual layer, multilayer are used, and order can be transferred.
4. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, the luminescent material that adds encapsulating material is at least the combination of one or more, and luminescent material is subject to the shortwave light chip and excites formation multimodal spectrum.
5. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, encapsulating material comprises matrix and curing agent, and described non-luminous nano granule is mixed in first in the matrix, after mixing, add again curing agent and mix.
6. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, luminescent material added in the encapsulating material before or after adding curing agent, mixed.
7. the color space that improves according to claim 1 distributes and light extraction efficiency multimodal spectrum LED, it is characterized in that, used shortwave light chip is that single chips output excitation energy or multiple chips form module output excitation energy.
8. according to claim 1 to 7 each described color spaces distribution and light extraction efficiency multimodal spectrum LED of improving, it is characterized in that, described non-luminescent material is TiO
2, Al
2O
3, SiO
2, ZrO
2, MgO, ZnO, AlN, diamond or BeO.
9. a manufacture method of improving color space distribution and light extraction efficiency multimodal spectrum LED is characterized in that, may further comprise the steps:
1) select one or more inertia nano particles, white non luminescent material, its refractive index is higher than the refractive index of encapsulating material, and thermal conductivity is higher than the thermal conductivity of encapsulating material, and the main peak of its particle size distribution function is in 3-50nm;
2) above-mentioned nano particle is carried out surface modification treatment, suppress the reunion of nano particle, improve with the interface of organic peak value material compatible;
3) nano particle with modification mixes encapsulating material, and high-speed stirred is to even, and the nano particle weight that it mixes accounts for encapsulating material total weight percent 0.01%-0.5%;
4) add curing agent, high-speed stirred;
5) mix luminescent material, luminescent material is one or more, high-speed stirred;
6) vacuum defoamation;
7) use dispensing technology to be made into the secondary radiation element layer; Or carry out step 1), 2), 3), 4), 6), use dispensing technology or mould molding fabrication techniques to become the lens element layer.
10. according to claim 9ly improve that color space distributes and the manufacture method of light extraction efficiency multimodal spectrum LED, it is characterized in that, secondary radiation element layer described in the step 7) and lens element layer can use by single or multiple lift, and order can be transferred when multilayer was used.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794704A (en) * | 2013-09-18 | 2014-05-14 | 吴震 | Wavelength conversion apparatus and light emitting device |
| JP2018137473A (en) * | 2018-04-13 | 2018-08-30 | 日亜化学工業株式会社 | Light-emitting device and manufacturing method therefor |
| JP7484130B2 (en) | 2019-11-01 | 2024-05-16 | セイコーエプソン株式会社 | Wavelength conversion element, light source device and projector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534074A (en) * | 2002-10-07 | 2004-10-06 | ͨ�õ�����˾ | Epoxy resin composition solid device packed by same and method |
| CN101084112A (en) * | 2004-11-16 | 2007-12-05 | 奈米晶材照明有限公司 | Optically reliable nanoparticle based nanocomposite hri encapsulant, photonic waveguiding material and high electric breakdown field strength insulator/encapsulant |
| US20090057699A1 (en) * | 2007-09-04 | 2009-03-05 | Philips Lumileds Lighting Company, Llc | LED with Particles in Encapsulant for Increased Light Extraction and Non-Yellow Off-State Color |
-
2012
- 2012-09-25 CN CN201210360035.7A patent/CN102916117B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534074A (en) * | 2002-10-07 | 2004-10-06 | ͨ�õ�����˾ | Epoxy resin composition solid device packed by same and method |
| CN101084112A (en) * | 2004-11-16 | 2007-12-05 | 奈米晶材照明有限公司 | Optically reliable nanoparticle based nanocomposite hri encapsulant, photonic waveguiding material and high electric breakdown field strength insulator/encapsulant |
| US20090057699A1 (en) * | 2007-09-04 | 2009-03-05 | Philips Lumileds Lighting Company, Llc | LED with Particles in Encapsulant for Increased Light Extraction and Non-Yellow Off-State Color |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794704A (en) * | 2013-09-18 | 2014-05-14 | 吴震 | Wavelength conversion apparatus and light emitting device |
| JP2018137473A (en) * | 2018-04-13 | 2018-08-30 | 日亜化学工業株式会社 | Light-emitting device and manufacturing method therefor |
| JP7484130B2 (en) | 2019-11-01 | 2024-05-16 | セイコーエプソン株式会社 | Wavelength conversion element, light source device and projector |
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| CN102916117B (en) | 2015-08-26 |
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