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Electroluminescent device with high light emitting efficiency

An electroluminescent device and electroluminescent layer technology, which can be applied to electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of low luminous efficiency and cumbersome preparation process, and achieve a simple preparation process and easy large-scale mass production. , the effect of improving light extraction efficiency

Inactive Publication Date: 2014-01-22
FIRST O LITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the shortcomings of the existing technical schemes, which are cumbersome preparation process and low luminous efficiency, and to develop a simple process that is convenient for large-scale mass production and can greatly improve the A Light Extraction Technology for Luminous Efficiency

Method used

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  • Electroluminescent device with high light emitting efficiency
  • Electroluminescent device with high light emitting efficiency
  • Electroluminescent device with high light emitting efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Such as Figure 4 As shown, the high-efficiency luminescent electroluminescent device of the present embodiment includes: a transparent substrate 1, a light scattering layer 2 on the transparent substrate 1, a surface smooth layer 3 on the light scattering layer 2, and a surface smooth layer 3 on the surface smooth layer 3. The electroluminescent layer; the light scattering layer 2 and the smooth surface layer 3 constitute the light extraction layer,

[0084] The light-scattering layer 2 includes egg-shaped light-scattering particles and a binder;

[0085] The surface smooth layer 3 includes inorganic nanoparticles and organic matrix with high refractive index;

[0086] The electroluminescent layer includes a transparent electrode layer 4 on the smooth surface layer,

[0087] An anti-short circuit layer 5 on the transparent electrode layer 4, an OLED light-emitting unit layer 6 with at least one light-emitting layer and a reflective electrode layer 7,

[0088] The su...

Embodiment 2

[0098] Example 2 Preparation of light scattering layer

[0099] 1) Preparation of egg-shaped light-scattering particles

[0100] Take 20g of titanium dioxide (DuPont R series), add 80g of solvent toluene and 1g of dispersant (Lubrizol Solsperse series), put 100g of grinding medium, put it in a ball mill, set the speed at 100rpm, and take a sample to analyze the kinetics after 5h Light scattering particle size. As shown in Figure 5, the effective particle size is 337.1nm.

[0101] 2) Preparation of light scattering layer

[0102] Take 10g of TiO prepared in the previous step 2Mix the suspension with 0.20 g of UV glue (Gulibao UV glue), take about 1mL of the mixture and add it dropwise on a 63.5*63.5mm glass substrate, and spin-coat at 1000 rpm to obtain a light-scattering layer. After UV curing for 15s, heat at 90 °C Baking for 15 minutes, the film thickness is 500-600nm.

Embodiment 3

[0103] Example 3 Preparation of light scattering layer

[0104] 1) Preparation of egg-shaped light-scattering particles

[0105] Mix 74.2g of dispersant (Lubrizol Solsperse series) and 2L of toluene in the grinding bucket evenly, add 742g of titanium dioxide (DuPont R series), stir for 10mins, start high-speed grinding, and take a sample to test the dynamic light scattering particle size after 1h. Such as Figure 6 As shown, the effective particle size is 284.2nm.

[0106] 2) Preparation of light scattering layer

[0107] Get 6.7g of the TiO prepared in the previous step 2 Suspension, after mixing 0.2g UV glue (Gulibao UV glue) and 3.1g toluene evenly, take 1ml of the mixture and add it dropwise on a 63.5*63.5mm glass substrate, spin coating at 1000 rpm to obtain a light scattering layer, and UV curing After 15 s, bake at 90°C for 15 min, and the film thickness is 400-500nm.

[0108] The surface morphology of the light scattering layer was analyzed. The surface roughnes...

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Abstract

The invention provides an electroluminescent device with high light emitting efficiency, which comprises a transparent substrate, a light scattering layer positioned on the transparent substrate, a surface smooth layer positioned on the light scattering layer and an electroluminescent layer positioned on the surface smooth layer. The electroluminescent device has the following technical effects: 1, light scattering particles are exposed out of an adhesive, each of the light scattering layer and the surface smooth layer is provided with a waved surface, light emitted from the light emitting layer is directly scattered by the waved light scattering particles after passing through the waved surface smooth layer with a high refractive index, parts of light rays which are less than a critical angle are directly emitted out, the light rays which are greater than or equal to the critical angle are reflected back, are reflected again by a reflection electrode layer, passes through the surface smooth layer and are scattered again, another part of light is extracted, and extraction is repeatedly carried out, so that the light extraction efficiency is greatly improved, and the waved surface of the light scattering layer increases an effective light emitting area; 2, the electroluminescent device adopts is simple in preparation process and facilitates scale mass production.

Description

technical field [0001] The invention relates to an electroluminescent device capable of emitting light with high efficiency, in particular to an electroluminescent device capable of improving luminous efficiency. Background technique [0002] Electroluminescent devices mainly include: organic electroluminescent devices (OLED), polymer electroluminescent devices (PLED) and inorganic electroluminescent devices. [0003] Existing electroluminescent devices generally include a transparent substrate, a transparent electrode layer, a light-emitting unit layer and a reflective electrode layer. Its luminescent mechanism is that the holes and electrons generated by the two electrode layers recombine into excitons in the luminescent material, and the energy of the excitons is transferred to the luminescent molecules, so that the electrons in the luminescent molecules are excited to the excited state, and the excited state is a In the unstable state, the deactivation process produces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/56
CPCH10K50/854H10K2102/341H10K71/00
Inventor 彭军军田元生
Owner FIRST O LITE
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