CN103219473A - White organic light emitting device with single light emitting layer structure - Google Patents
White organic light emitting device with single light emitting layer structure Download PDFInfo
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- CN103219473A CN103219473A CN2013101490982A CN201310149098A CN103219473A CN 103219473 A CN103219473 A CN 103219473A CN 2013101490982 A CN2013101490982 A CN 2013101490982A CN 201310149098 A CN201310149098 A CN 201310149098A CN 103219473 A CN103219473 A CN 103219473A
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Abstract
The invention discloses a white organic light emitting device with a single light emitting layer structure. According to the structure, the white organic light emitting device with the single light emitting layer structure is mainly composed of an ITO glass substrate, a hole transfer layer, an electron blocking layer, a light emitting layer, an electron transfer layer and a composite cathode, wherein the light emitting layer forms a single-layer light emitting layer through a subject-object doping system in a composite mode, subject materials forming the light emitting layer are mCPy, object materials forming the light emitting layer are excimer phosphorescence dye, the doping concentration of the object materials is between 8 wt% and 20 wt%, the light emitting layer can simultaneously emit blue light and red light, and the blue light and the red light are mixed to form white light. A triplet state energy level of the electron blocking layer and a triplet state energy level of the electron transfer layer are both higher than a triplet state energy level of the object materials of the light emitting layer, excition can be effectively bound in the light emitting layer, and an exicition binding structure is formed. The white organic light emitting device with the single light emitting layer structure has the advantages of being simple in structure and stable in chromaticity and efficiency.
Description
Technical field
The present invention relates to a kind of organic electroluminescence device, particularly relate to a kind of white light organic electroluminescent device, be applied to the manufacturing technology field of organic EL display panel.
Background technology
White light organic electroluminescent device (White Organic Light Emitting Device, OLED) because have that ultralight is thin, pliability, response are fast, low-power consumption and make characteristics such as simple, have very big application potential in fields such as flat-panel monitor, LCD module backlight and illuminations, especially realizing aspect the large tracts of land demonstration great potential being arranged.These application requirements white light OLEDs possess high brightness, high efficiency, long-life, high color purity, and characteristic such as chroma stability.
Realize that the most frequently used structure of white light OLED device is three luminous layer structures, promptly adopt three luminescent layers of R, G, B three primary colors to produce white light.Though three luminescent layer device efficient are higher, its complicated process of preparation of one side, cost height; On the other hand, the charge carrier recombination region can be moved with the variation of driving voltage, causes chromaticity coordinates to change with driving voltage, i.e. the look drift phenomenon.
Summary of the invention
In order to solve the prior art problem, the objective of the invention is to overcome the deficiency that prior art exists, a kind of white light organic electroluminescent device with single-shot photosphere structure is provided, its luminescent layer adopts host and guest's doped system, object is the excimer phosphorescent coloring, can send blue light and ruddiness simultaneously.Electronic barrier layer and electron transfer layer are the higher material of triplet, can effectively exciton be strapped in the luminescent layer.That the present invention has is simple in structure, the characteristics of chroma stability, stabilised efficiency.
For achieving the above object, the present invention adopts following technical proposals:
A kind of white light organic electroluminescent device with single-shot photosphere structure, its structure mainly is made of ito glass substrate, hole transmission layer, electronic barrier layer, luminescent layer, electron transfer layer and composite cathode, luminescent layer is compounded to form the individual layer luminescent layer by the Subjective and Objective doped system, the material of main part that constitutes luminescent layer is mCPy, the guest materials that constitutes luminescent layer is the excimer phosphorescent coloring, its guest materials doping content is between 8 wt % ~ 20 wt %, make luminescent layer can send blue light and ruddiness simultaneously, blue light and ruddiness and then mixing form white light.The guest materials that constitutes luminescent layer preferably adopts Pt-4, FPt or PtL
26Cl.
As improvement technical scheme of the present invention, the triplet of electronic barrier layer and electron transfer layer all is higher than the triplet of the guest materials of luminescent layer, exciton can be strapped in the luminescent layer, forms exciton constraint structure.The material of electronic barrier layer preferably adopts TCTA.The material of electron transfer layer preferably adopts TPBI or BCP.
Above-mentioned composite cathode preferably adopts LiF material layer and electrode metal material layer to be compounded to form, and the material of electrode metal layer is Al, Li, Ca, Ba, Mg or Ag.
The material of above-mentioned hole transmission layer preferably adopts NPB.
The thickness of above-mentioned hole transmission layer is preferably 40nm, and the thickness of above-mentioned electronic barrier layer is preferably 5nm, and the thickness of above-mentioned luminescent layer is preferably 20nm, and above-mentioned electric transmission layer thickness is preferably 30nm.
Technical scheme as a further improvement on the present invention, the material of composite cathode are preferably the LiF material layer and the Al material layer is compounded to form, and wherein LiF material layer thickness is 0.5nm, and Al material layer thickness is 100nm.
Above-mentioned hole transmission layer, electronic barrier layer, luminescent layer and electron transfer layer all preferably adopt vacuum evaporation process to make and form.
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art:
1. excimer can produce blue light simultaneously and ruddiness forms white light owing to the present invention has in the single-shot photosphere of white light organic electroluminescent device of single-shot photosphere structure, has simplified device architecture so greatly, has reduced preparation cost;
2. the present invention can be strapped in exciton in the luminescent layer effectively by the exciton constraint structure that electronic barrier layer and electron transfer layer form simultaneously, has improved the chromaticity stability and the stabilised efficiency of device greatly.
Description of drawings
Fig. 1 has the structural representation of the white light organic electroluminescent device of single-shot photosphere structure for the embodiment of the invention one.
Embodiment
Details are as follows for the preferred embodiments of the present invention:
Embodiment one:
In the present embodiment, referring to Fig. 1, a kind of white light organic electroluminescent device with single-shot photosphere structure, its structure is mainly by ito glass substrate 1, hole transmission layer 2, electronic barrier layer 3, luminescent layer 4, electron transfer layer 5 and composite cathode 6 constitute, luminescent layer 4 is compounded to form the individual layer luminescent layer by the Subjective and Objective doped system, the material of main part that constitutes luminescent layer 4 is 1,3-bis (9-carbazolyl) benzene, be mCP, 2,6-bis (N-carbazolyl) pyridine, i.e. mCPy, the guest materials that constitutes luminescent layer 4 is platinum [1,3-difluoro-4,6-di (2-pyridinyl) benzene] chloride, i.e. Pt-4, its guest materials doping content is 8 wt %, its emission spectrum comprises blue light peak and ruddiness peak simultaneously, and blue light and ruddiness and then mixing form white light, and the thickness of luminescent layer 4 is 20nm.Single-shot photosphere structure has overcome the complicated and high deficiency of cost of three luminescent layer device preparation technology, and excimer produces blue light and ruddiness simultaneously and forms white light in the single-shot photosphere, has simplified device architecture so greatly, has reduced preparation cost.The triplet of electronic barrier layer 3 and electron transfer layer 5 all is higher than the triplet of the guest materials of luminescent layer 4, can exciton be strapped in the luminescent layer 4 effectively, form exciton constraint structure, the electronic barrier layer material is 4,4', 4 " tri (N-carbazolyl) triphenylamine; be TCTA; the thickness of electronic barrier layer 3 is 5nm; the electric transmission layer material is 1,3,5-tris (2-N-phenylbenzimidazolyl) benzene; be TPBI, electron transfer layer 5 thickness are 30nm.Present embodiment limits the exciton recombination zone territory of organic electroluminescence device, the defective that the charge carrier recombination region that has overcome common OLED device is moved with the variation of driving voltage, effectively having controlled chromaticity coordinates changes with driving voltage, prevented the generation of look drift phenomenon, make organic electroluminescence device send the white light of chroma stability, hole transmission layer 2, electronic barrier layer 3, luminescent layer 4 and electron transfer layer 5 all adopt vacuum evaporation process to make and form.The hole transmission layer material therefor is N, N '-diphenyl-N, N '-bis (1-naphthyl)-1,1 '-biphenyl-4,4, and " thickness is 40nm for diamine, i.e. NPB.
Embodiment two:
Present embodiment and embodiment one are basic identical, and special feature is:
In the present embodiment, material of main part is mCPy in the luminescent layer 4, guest materials be platinum (II) [1,3 ?difluoro-4,6-di (2-pyridinyl) benzene] chloride, be that the FPt doping content is 12 wt%, the electronic barrier layer material is TCTA, and the electric transmission layer material is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), i.e. BCP.The white brightness height that the present embodiment organic electroluminescence device sends, efficient height, colorimetric purity height, chroma stability.
Embodiment three:
Present embodiment and previous embodiment are basic identical, and special feature is:
In the present embodiment, material of main part is mCP in the luminescent layer 4, and guest materials is platinum N^C2^N-[1,3-di (4-methoxy-pyrid-2-yl)-4,6-difluorobenzene] chloride, i.e. PtL
26Cl, doping content is 20 wt%, and the electronic barrier layer material is TCTA, and the electric transmission layer material is TPBI.The white light that the present embodiment organic electroluminescence device sends also has the characteristics of high brightness, high efficiency, high color purity and chroma stability.
Embodiment four:
Present embodiment and previous embodiment are basic identical, and special feature is:
In the present embodiment, the material of composite cathode 6 is that LiF material layer and Al material layer are compounded to form, and wherein LiF material layer thickness is 0.5nm, and Al material layer thickness is 100nm.The composite cathode 6 that is made of LiF material layer and Al material layer conducts electricity very well, the efficient height, and Al the cost of material is low, it is simple to make Al material layer technology, production cost is low.
In conjunction with the accompanying drawings the embodiment of the invention is illustrated above; but the invention is not restricted to the foregoing description; can also make multiple variation according to the purpose of innovation and creation of the present invention; all according to technical solution of the present invention spirit and principle under make change, modification, substitute, combination, simplify; all should be the substitute mode of equivalence; as long as goal of the invention according to the invention; only otherwise deviate from know-why and the inventive concept that the present invention has the white light organic electroluminescent device of single-shot photosphere structure, all belong to protection scope of the present invention.
Claims (10)
1. white light organic electroluminescent device with single-shot photosphere structure, its structure is mainly by ito glass substrate (1), hole transmission layer (2), electronic barrier layer (3), luminescent layer (4), electron transfer layer (5) and composite cathode (6) constitute, it is characterized in that: described luminescent layer (4) is compounded to form the individual layer luminescent layer by the Subjective and Objective doped system, the material of main part that constitutes described luminescent layer (4) is mCPy, the guest materials that constitutes described luminescent layer (4) is the excimer phosphorescent coloring, its guest materials doping content is between 8 wt % ~ 20 wt %, make described luminescent layer (4) can send blue light and ruddiness simultaneously, blue light and ruddiness and then mixing form white light.
2. the white light organic electroluminescent device with single-shot photosphere structure according to claim 1, it is characterized in that: the triplet of described electronic barrier layer (3) and described electron transfer layer (5) all is higher than the triplet of the guest materials of described luminescent layer (4), exciton can be strapped in the described luminescent layer (4), form exciton constraint structure.
3. the white light organic electroluminescent device with single-shot photosphere structure according to claim 2 is characterized in that: the material of described electronic barrier layer (3) is TCTA.
4. the white light organic electroluminescent device with single-shot photosphere structure according to claim 3 is characterized in that: the material of described electron transfer layer (5) is TPBI or BCP.
5. according to any described white light organic electroluminescent device with single-shot photosphere structure in the claim 1～4, it is characterized in that: the guest materials that constitutes described luminescent layer (4) is Pt-4, FPt or PtL
26Cl.
6. according to any described white light organic electroluminescent device in the claim 1～4 with single-shot photosphere structure, it is characterized in that: described composite cathode (6) is for LiF material layer and electrode metal material layer are compounded to form, and the material of described electrode metal layer is Al, Li, Ca, Ba, Mg or Ag.
7. according to any described white light organic electroluminescent device with single-shot photosphere structure in the claim 1～4, it is characterized in that: the material of described hole transmission layer (2) is NPB.
8. according to any described white light organic electroluminescent device in the claim 1～4 with single-shot photosphere structure, it is characterized in that: the thickness of described hole transmission layer (2) is 40nm, the thickness of described electronic barrier layer (3) is 5nm, the thickness of described luminescent layer (4) is 20nm, and described electron transfer layer (5) thickness is 30nm.
9. the white light organic electroluminescent device with single-shot photosphere structure according to claim 6, it is characterized in that: the material of described composite cathode (6) is that LiF material layer and Al material layer are compounded to form, wherein LiF material layer thickness is 0.5nm, and Al material layer thickness is 100nm.
10. according to any described white light organic electroluminescent device with single-shot photosphere structure in the claim 1～4, it is characterized in that: described hole transmission layer (2), described electronic barrier layer (3), described luminescent layer (4) and described electron transfer layer (5) all adopt vacuum evaporation process to make and form.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993062A (en) * | 2015-05-20 | 2015-10-21 | 上海交通大学 | A method for adjusting the white light spectrum of white organic electroluminescent light-emitting diodes |
| CN105206715A (en) * | 2015-09-16 | 2015-12-30 | Tcl集团股份有限公司 | QLED with exciton confinement structure and manufacturing method thereof |
| CN105609653A (en) * | 2016-03-09 | 2016-05-25 | 苏州大学 | White-light OLED device and preparation method thereof |
| CN106654032A (en) * | 2016-12-29 | 2017-05-10 | 苏州大学 | Monolayer full-phosphorescence white-light organic electroluminescent device and preparation method thereof |
| CN107123749A (en) * | 2017-04-01 | 2017-09-01 | 中山大学 | A kind of high color rendering index (CRI) white light organic electroluminescent device and preparation method thereof |
| WO2018184264A1 (en) * | 2017-04-05 | 2018-10-11 | 武汉华星光电技术有限公司 | Processing method of raw material of light-emitting layer in oled and application thereof |
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| CN102246328A (en) * | 2008-10-07 | 2011-11-16 | 欧司朗光电半导体有限公司 | Siloles substituted with condensed ring systems and use thereof in organic electronics |
| CN102244199A (en) * | 2011-07-06 | 2011-11-16 | 上海大学 | OEL (organic electroluminescence) plant lighting source and manufacturing method thereof |
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| US7267891B2 (en) * | 2003-03-31 | 2007-09-11 | Sanyo Electric Co., Ltd. | Compound for light emitting device and organic light emitting device using the same |
| CN101179116A (en) * | 2007-12-17 | 2008-05-14 | 中国科学院长春应用化学研究所 | Double phosphorescent coloring agent common adulterate white light organic electroluminescent device and method for fabricating the same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993062A (en) * | 2015-05-20 | 2015-10-21 | 上海交通大学 | A method for adjusting the white light spectrum of white organic electroluminescent light-emitting diodes |
| CN105206715A (en) * | 2015-09-16 | 2015-12-30 | Tcl集团股份有限公司 | QLED with exciton confinement structure and manufacturing method thereof |
| CN105206715B (en) * | 2015-09-16 | 2019-09-17 | Tcl集团股份有限公司 | A kind of QLED and preparation method thereof of exciton confinement structure |
| CN105609653A (en) * | 2016-03-09 | 2016-05-25 | 苏州大学 | White-light OLED device and preparation method thereof |
| CN106654032A (en) * | 2016-12-29 | 2017-05-10 | 苏州大学 | Monolayer full-phosphorescence white-light organic electroluminescent device and preparation method thereof |
| CN107123749A (en) * | 2017-04-01 | 2017-09-01 | 中山大学 | A kind of high color rendering index (CRI) white light organic electroluminescent device and preparation method thereof |
| WO2018184264A1 (en) * | 2017-04-05 | 2018-10-11 | 武汉华星光电技术有限公司 | Processing method of raw material of light-emitting layer in oled and application thereof |
| US10297795B2 (en) | 2017-04-05 | 2019-05-21 | Wuhan China Star Optoelectronics Technology Co., Ltd | Treatment method of emitting layer raw material in OLED and application |
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Application publication date: 20130724 |