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Optical thin film with random pyramid morphology texture and its preparation method

A technology of optical thin film and pyramid, applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc., can solve problems such as high cost, complex process, and distortion of emission spectrum, and achieve low manufacturing cost, simple operation, and low cost Effect

Inactive Publication Date: 2018-08-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these methods are complex in process, high in cost and difficult to be applied in large-scale production.
Moreover, most of the light extraction technologies currently reported use periodic micro- and nanoscale structures to enhance light extraction, but many periodic structures are prone to distort the emission spectrum or shift the emission spectrum with the viewing angle. It is easy to change the angular distribution of device brightness and deviate from the ideal Lambertian distribution
For example, the suede surface of the pyramid shape reported in the past is a regular pyramid array, which is easy to cause changes in the relationship between the luminous intensity and angle of OLED devices, which is not conducive to the practical application of OLEDs.

Method used

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  • Optical thin film with random pyramid morphology texture and its preparation method
  • Optical thin film with random pyramid morphology texture and its preparation method
  • Optical thin film with random pyramid morphology texture and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In this example, see Figure 1~3 , a kind of optical thin film with random pyramid appearance suede, comprising a transparent substrate 2 of the optical film, one side surface of the transparent base 2 has a random pyramid appearance suede 1, the random pyramid appearance suede 1 is composed of a series of The pyramid-shaped structure with uneven size and position forms a pyramid array arranged randomly, forming a non-planar light-scattering functional structural layer, and the other side surface of the transparent substrate 2 forms a bottom connecting layer 3 that can be closely connected with the OLED substrate 4. Each pyramid of the random pyramid shaped suede 1 is a cone with four upper surfaces. The size and height of the pyramids of the suede surface 1 with the random pyramid shape are 2-10 microns. The apex angle of each pyramid of the suede surface 1 of the random pyramid shape is 80°-100°. The transparent substrate 2 is made of NOA63 optical glue. The connec...

Embodiment 2

[0033] This embodiment is basically the same as Embodiment 1, especially in that:

[0034] In this embodiment, Ausbond3301 optical glue is used as the main material of the optical film.

[0035] In this embodiment, the preparation method of the optical film with a random pyramid shape suede in this embodiment is prepared by a two-step transfer printing method, and the specific steps are as follows:

[0036] a. This step is identical with embodiment one;

[0037] b. This step is identical with embodiment one;

[0038] c. Transfer process of random pyramid texture: the structure of OLED device is ITO(100nm) / MoO 3 (5nm) / NPB(60nm) / Alq3(60nm) / LiF(0.5nm) / Al(100nm) OLED device, when the pixel size of the device is 5mm*5mm, Ausbond3301 optical glue is used as the body material of the optical film, Apply Ausbond3301 optical glue on the PDMS film prepared in step b and stick it on the surface of the OLED glass substrate. Using the PDMS soft template with inverted pyramid structure pr...

Embodiment 3

[0042] This embodiment is basically the same as the previous embodiment, and the special features are:

[0043] In this embodiment, NOA63 optical glue is used as the bulk material of the optical film.

[0044] In this embodiment, the preparation method of the optical film with a random pyramid shape suede in this embodiment is prepared by a two-step transfer printing method, and the specific steps are as follows:

[0045] a. The manufacturing process of the template with random pyramid suede: a single crystal silicon wafer with a P-type resistance of 1-5Ω (100) crystal orientation is used as the template substrate, and the single crystal silicon wafer (100) is washed with acetone, alcohol, Ultrasonic cleaning with deionized water. After cleaning, use 5% HF to remove the natural oxide layer on the surface, and then clean it with a large amount of deionized water. Using alkaline solution as an etchant, place the cleaned silicon wafer at a mass concentration of In a mixed soluti...

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Abstract

The invention discloses an optical thin film with a random pyramid-shaped suede surface, which comprises a transparent substrate of the optical film, one side surface of the transparent substrate has a random pyramid-shaped suede surface, and the random pyramid-shaped suede surface is composed of a series of Pyramid structures with uneven size and position form a pyramid array randomly arranged to form a non-planar light-scattering functional structural layer, and the other side surface of the transparent substrate forms a bottom connection layer that can be closely connected with the OLED substrate. The invention discloses a preparation method of an optical thin film with a random pyramid shape suede, which is prepared by a two-step transfer printing method, and the process flow includes the manufacture of a random pyramid template, the manufacture of an inverted pyramid soft template, and the transfer of the suede. The optical thin film with a random pyramid shape suede surface of the present invention is used as a brightening film of an OLED, which can significantly increase the light extraction efficiency of a light-emitting device, has a simple structure, and is easy to manufacture. The method of the present invention is obtained by transferring a silicon chip with a pyramid shape in two steps. Pyramid shape, simple process and low cost.

Description

technical field [0001] The invention relates to an optical structural functional element of an organic electroluminescence device and a preparation method thereof, in particular to an optical structural functional element for improving the light extraction efficiency of an OLED device and a preparation method thereof, which is applied to OLED lighting and display device technologies field. Background technique [0002] At present, organic electroluminescent devices (OLEDs) have become an ideal technology for next-generation lighting displays due to their advantages of high efficiency, self-luminescence, low cost, and flexible devices. After decades of development, the luminescent material and electrical structure of OLED have been greatly improved, and its internal quantum efficiency is close to the theoretical limit of 100%. However, the low light extraction efficiency is a major bottleneck for improving device efficiency. Taking the traditional bottom-emitting OLED as an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52H01L51/56
CPCH10K50/85H10K71/00
Inventor 朱文清肖腾翟光胜俞静婷钱冰洁
Owner SHANGHAI UNIV
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