Method for improving efficiency of outing light coupled from tabulate light emitting device

A technology of light-emitting devices and light extraction efficiency, which is applied in the manufacture of semiconductor devices, electric solid-state devices, semiconductor/solid-state devices, etc. It can solve the problems of difficult control of the size of micro-lenses and achieve the effect of consistent size

Inactive Publication Date: 2007-05-09
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 light-coupling efficiency of flat-panel light-emitting devices. Aiming at the shortcomings of the complicated process of making microlenses in the past, or the difficulty in controlling the size of microlenses, it is proposed to make microspheres first, and then use the screened microspheres A method of semi-pressing microspheres into a polymer pre-spin-coated on an organic light-emitting device substrate to form a microlens-like structure

Method used

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  • Method for improving efficiency of outing light coupled from tabulate light emitting device
  • Method for improving efficiency of outing light coupled from tabulate light emitting device
  • Method for improving efficiency of outing light coupled from tabulate light emitting device

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Embodiment 1

[0037] Monodisperse silica microspheres of various diameters were prepared in ethanol. For narrowly dispersed silica microspheres with a diameter below 500nm, the following method is used: 14ml tetraethyl orthosilicate is dissolved in 100ml ethanol, 27.5ml water, 9.5ml ammonia water are dissolved in 100ml ethanol, and then the two solutions are mixed and stirred at room temperature 6 hours. The emulsion was then centrifuged and washed three times with ethanol or water, and finally dried in an oven at 60°C. For silica microspheres with a diameter of 500nm to 1.4μm, the operation is similar to the above, only need to introduce a seed silica powder or emulsion with a size of 250nm to 500nm in the system (if it is a powder, it needs to be completely dispersed by ultrasonic before use. ). After the reaction is completed, wash and dry in the same way.

[0038] The microspheres with different diameters are classified by a centrifuge, and the silica microspheres with a diameter of ...

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Abstract

The invention relates to method for improving efficiency of outputting light coupled from tabulate light emitting device. Microsphere array with diameter in Nano or micro magnitude is utilized in the invention. Using micro contacted printing technique presses half microsphere in polymer spin coated on substrate of organic light emitting device. Then, first clear electrode, organic material layer, and second clear electrode are piled on the other face of the substrate. Characters are that refractive indexes of microsphere, the polymer, and substrate are kept equal or close. Thus, refraction, reflection effects at interfaces between substrate and polymer as well as polymer and microsphere can be ignored so as to raise efficiency of outputting light coupled from device. Features are: simpler technical process with no photo etching, selectable diameter of microsphere so as to form similar even micro lenses.

Description

technical field [0001] The invention belongs to the field of flat light-emitting devices, in particular to the field of organic electroluminescence devices, and specifically relates to a method for improving the light-coupling efficiency of flat light-emitting devices. Background technique [0002] Organic electroluminescent devices are devices that use injected carriers to emit light. They have the advantages of autonomous light emission, low-voltage drive, wide viewing angle, fast response, and rich colors. Therefore, they have attracted wide attention as next-generation display devices. [0003] The typical structure of an organic electroluminescent device is: substrate / anode / organic light-emitting layer / cathode. Due to the difference in refractive index of the materials that make up each layer, refraction and reflection will be formed at the interface of each layer, and total reflection will also be formed when light is incident from a material layer with a high refracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L27/32H01L21/82
Inventor 李峰张俊虎杨柏
Owner JILIN UNIV
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