Transparent diffusive OLED substrate and method for producing such a substrate

A diffusive, substrate technology that can be used in instruments, optical components, coatings, etc., to solve problems such as worker safety, complex processes, and difficulty in optimizing roughness profile parameters.

Inactive Publication Date: 2015-12-23
SAINT-GOBAIN GLASS FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such wet chemistry is a complex process when performed on thin glass (thickness < 1 mm)
This technique allows only one of the two sides to be etched per process step, since the glass sheet must remain in a horizontal position during the etching step
Furthermore, it is difficult to optimize the roughness profile parameters and especially the use of HF creates serious safety issues for the environment and nearby workers

Method used

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  • Transparent diffusive OLED substrate and method for producing such a substrate
  • Transparent diffusive OLED substrate and method for producing such a substrate

Examples

Experimental program
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Effect test

Embodiment Construction

[0069] 20 g of organomodified silica beads having an average diameter of 2.5 μm were dispersed in 150 g of 2-methoxy-propanol and dispersed by ultrasound. To this dispersion add 30g of Xenios ? Surface Perfection (Evonik GmbH). The resulting dispersion was then applied to a clean glass substrate by dip coating and dried at 120° C. for about 1 minute. The dried, coated substrate was then heated at a rate of 5°C / minute to a temperature of 500°C and fired at this temperature for 5 minutes.

[0070] figure 1 and figure 2 SEM micrographs of the rough low index layer after firing and before planarization with high index frit are shown. The spherical particles can be seen laying down in a very tightly packed monolayer on the glass substrate.

[0071] The resulting low refractive index rough layer was then coated by screen printing using a paste of high refractive index frit (n=1.90). The coating was dried at 150°C and fired in an IR oven at 545°C for 10 minutes.

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Abstract

The present invention is drawn to a transparent diffusive OLED substrate comprising the following successive layers: (a) a transparent flat substrate (1 ) made of mineral glass having a refractive index of between 1.45 and 1.65, (b) a rough low index layer comprising mineral particles, said mineral particles being attached to one side of the substrate by means of a sol-gel mineral binder, the mineral particles near, at or protruding from the mineral binder's surface creating a surface roughness characterized by an arithmetical mean deviation Ra comprised between 0.15 and 3 [mu]m, the mineral particles and mineral binder both having a refractive index of between 1.45 and 1.65; (c) a high index layer made of an enamel having a refractive index comprised between 1.8 and 2.1 covering the rough low index layer; and to a process for making such a diffusive OLED substrate.

Description

technical field [0001] The present invention relates to a new method of manufacturing translucent light-scattering substrates for organic light-emitting diodes (OLEDs) and substrates obtainable by such a method. Background technique [0002] OLEDs are optoelectronic elements comprising a stack of organic layers with fluorescent or phosphorescent dyes sandwiched between two electrodes, at least one of which is translucent. When a voltage is applied to the electrodes, electrons injected from the cathode and holes injected from the anode recombine within the organic layer, resulting in light emission from the fluorescent / phosphorescent layer. [0003] It is well known that light extraction from conventional OLEDs is relatively poor, and most of the light is captured through high-index organic layers and total internal reflection in transparent conductive layers (TCLs). Total internal reflection occurs not only at the boundary between the high refractive index TCL and the und...

Claims

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Application Information

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IPC IPC(8): C03C3/064C03C8/02C03C17/34G02B1/11
CPCC03C3/064C03C8/02C03C17/3417G02B1/11C03C2217/46C03C2217/478C03C2217/734Y02E10/549H10K50/854C03C17/002C03C17/007C03C17/008C03C17/009C03C17/04C03C17/3411H10K77/10G02B5/0221G02B5/0242G02B5/0226
InventorG.勒康V.索维内N.舍曼
OwnerSAINT-GOBAIN GLASS FRANCE