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Transparent oled light extraction

A light extraction film, transparent and conductive technology, applied in optics, optical components, instruments, etc., can solve problems such as limited bottom emission design options

Active Publication Date: 2015-07-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bottom emitting design options for controlling such important optical parameters such as light outcoupling (light extraction) or ambient contrast are limited

Method used

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  • Transparent oled light extraction
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Examples

Experimental program
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Effect test

example

[0054] All parts, percentages, ratios, etc. in the examples are by weight unless otherwise indicated. Solvents and other reagents used were purchased from Sigma-Aldrich Chemical Company, Milwaukee, WI unless otherwise noted.

[0055] Material

[0056]

preparation example

[0058] D510 Stabilized 50nm TiO 2 Preparation of Nanoparticle Dispersions

[0059] In the presence of SOLPLUS D510 and 1-methoxy-2-propanol, a grinding process was used to prepare TiO 2 TiO 2 Nanoparticle Dispersion. According to TiO 2 The weight of SOLPLUS D510 is added in an amount of 25% by weight. The mixture was premixed for 10 minutes using a DISPERMAT mixer (Paul N. Gardner Company, Inc., Pompano Beach, FL), and then subjected to the following conditions To use NETZSCH MiniCer grinder (Netzsch Premier Technologies, LLC., Exton, PA, Exton, Pennsylvania): 4300 rpm, YTZ grinding media of 0.2 mm, 250 ml / min flow rate. After 1 hour of grinding, TiO in 1-methoxy-2-propanol was obtained 2 Dispersion, white paste. Particles were sized to 50 nm (Z-average size) using a Malvern Instruments ZETASIZER Nano ZS (Malvern Instruments Inc, Westborough, MA).

[0060] Preparation of High Refractive Index Backfill Solution (HI-BF) :

[0061] 20g of D510 stabilized with 50...

example 1

[0067] Using standard thermal deposition method at a base pressure of about 10 -6 Top-emitting (TE) OLED samples were constructed in a Torr vacuum system. Substrates with a 0.5 μm thick photoresist coating and an 80 nm ITO coating patterned to create four 5×5 mm square-arranged pixels were fabricated on ground float glass. A pixel defining layer (PDL) was applied to reduce the size of the squares to 4x4 mm and provide sharply defined pixel edges. Build the following structure:

[0068] Substrate / 80nm ITO lower electrode (cathode) / 20nm EIL / 25nm ETL / 30nm EML / 10nm HTL2 / 165nm HTL1 / 100nm HIL / 80nm ITO upper electrode (anode) / 200nm MoO3 cover layer ( CPL)

[0069] Among them, HIL, HTL, EML and ETL are respectively static for hole injection, hole transport, emission and electron transport layers. The top electrode is 80nm ITO, which is patterned through a shadow mask to align with the substrate layer. A pixel defining layer (PDL) was applied to reduce the size of the squares to 4...

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Abstract

The present disclosure provides novel light emitting devices including AMOLED displays, based on transparent OLED architecture, where a laminated nanostructurcd light extraction film can produce axial and integrated optical gains as well as improved angular luminance and color. Generally, the transparent AMOLED displays (100) with laminated sub-micron extractors (llOa-c) include: (a) an extractor (110a) on a transparent substrate (112a) for light outcoupling on both sides of the transparent device (120); or (b) an extractor (110b) on a reflective film (112b) for providing light outcoupling off the bottom side of the bottom-emitting (BE) AMOLED (120); or (c) an extractor (110c) on a light absorbing film (112c) for providing outcoupling off the bottom side of the BE AMOLED (120) combined with improved ambient contrast.

Description

[0001] Related Patent Applications [0002] This patent application is related to the following US patent application, "MICROCAVITY OLED LIGHT EXTRACTION" (Attorney Docket No. 70115US002), filed on the same date as this application, which is incorporated herein by reference. Background technique [0003] Organic light emitting diode (OLED) devices comprise a thin film of electroluminescent organic material sandwiched between a cathode and an anode, where one or both of these electrodes are transparent conductors. Upon application of a voltage across the device, electrons and holes are injected from their respective electrodes and recombine in the electroluminescent organic material through intermediate formation of emitted excitons. [0004] In OLED devices, more than 70% of the generated light is typically lost due to processes within the device structure. The step of trapping light at the interface between the higher-index organic and indium tin oxide (ITO) layers and the ...

Claims

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Application Information

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IPC IPC(8): H01L51/52
CPCH01L51/5275H01L2251/5323H01L51/5268G02B5/1866H10K2102/3031H10K59/878H10K59/879H10K59/877H10K59/12H10K50/858H10K50/11H10K50/84H10K50/816H10K50/828H10K50/841H10K50/854H10K50/856H10K2102/331
Inventor 谢尔盖·拉曼斯基吉代沃·阿雷费基思·L·贝尔曼史蒂文·J·麦克曼乔纳森·A·阿尼姆-阿多威廉·A·托尔伯特
Owner 3M INNOVATIVE PROPERTIES CO
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