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Method for improving coupling luminous efficiency of flat plate luminescent device

A technology for light-emitting devices and light extraction efficiency, which is applied in the manufacture of electrical solid-state devices, semiconductor devices, semiconductor/solid-state devices, etc., and can solve problems such as complicated micro-lens technology, difficult control of micro-lens size, and poor mechanical properties of micro-lenses

Inactive Publication Date: 2010-08-25
JILIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a simple method for improving the coupling light efficiency of flat-panel light-emitting devices. Aiming at the shortcomings of the traditional manufacturing process of micro-lenses, the size of micro-lenses is difficult to control, and the mechanical properties of micro-lenses are not good. The method of directly etching the surface of the substrate of the luminescent device to prepare a nanocone array can reduce the reflection of light on the substrate surface and increase the transmission of light, thereby limiting the total reflection of light at the interface between the substrate and the air, and improving the coupling efficiency of light

Method used

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  • Method for improving coupling luminous efficiency of flat plate luminescent device

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Embodiment 1

[0028] 1. The preparation method of polystyrene microspheres:

[0029] Under nitrogen protection, with 40 milliliters of absolute ethanol and 100 milliliters of deionized water as the dispersion medium, 3.3 milliliters of styrene, 0.0733 grams of potassium persulfate, and 0.0807 grams of sodium dodecylsulfonate were added to the In the reactor of the mechanical stirrer and the reflux condenser, the mechanical stirring speed was 350 rpm. The polymerization reaction was carried out in a water bath at 70° C., and after 10 hours of reaction, a stable milky white emulsion of monodisperse polystyrene microspheres was obtained, and the diameter of the microspheres was 204 nanometers.

[0030] 2. Preparation of tightly packed monolayer polystyrene microspheres:

[0031]The prepared polystyrene microspheres were centrifuged and washed, and then dispersed with a mixed solution of absolute ethanol and deionized water with a volume ratio of 1.5:1 to obtain a monodisperse polystyrene micr...

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Abstract

The invention belongs to the field of flat plate luminescent devices, in particular to the field of organic electroluminescent devices, and relates to a method for improving the coupling luminous efficiency of the flat plate luminescent device, in particular to a method for improving the coupling luminous efficiency of the flat plate luminescent device by preparing a nano-cone array on the surface of a substrate of the organic electroluminescent device through direct etching. In the method, the coupling luminous efficiency of a white organic electroluminescent device is improved by 1.4 times by using excellent broad band anti-reflection performance of the nano-cone array. Simultaneously, the ratio of the luminous intensity of one apparatus to that of another apparatus is increased by 60 times when an angle is up to 70 degrees.

Description

technical field [0001] The invention belongs to the field of flat light-emitting devices, in particular to the field of organic electroluminescent devices, and specifically relates to a method for improving the light-coupling efficiency of a flat light-emitting device. Background technique [0002] Organic electroluminescent devices are injection-type light-emitting diodes, that is, devices that convert electrical energy into light energy. First, electrons and holes are injected into the organic light-emitting layer from the electrodes on both sides, and then the carriers are in the organic layer under the action of an external electric field. Excitons are formed after migration and recombination in the light-emitting layer, and the excitons radiatively recombine in the light-emitting layer to emit light; it has the advantages of autonomous light emission, low-voltage drive, wide viewing angle, fast response, and rich colors. In particular, white organic light-emitting devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/52
Inventor 杨柏李云峰李峰张俊虎朱守俊
Owner JILIN UNIV
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