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Forming improved stabiity emissive layer from donor element in OLED device

A technology of stability and emission layer, applied in electrical components, electric solid-state devices, semiconductor devices, etc., can solve problems such as lowering stability, and achieve the effect of lowering working voltage, improving stability, and improving working stability

Inactive Publication Date: 2004-10-27
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this is a useful fabrication technique, EL devices containing emissive layers prepared by this method have reduced stability compared to EL devices containing emissive layers prepared by other methods such as vapor deposition

Method used

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  • Forming improved stabiity emissive layer from donor element in OLED device
  • Forming improved stabiity emissive layer from donor element in OLED device
  • Forming improved stabiity emissive layer from donor element in OLED device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Embodiment 1 (the embodiment of the present invention)

[0135] An OLED device meeting the requirements of the present invention and doped with an organic layer of a low work function metal is manufactured by the following method:

[0136] 1. Vacuum deposition of indium tin oxide (ITO) on a clean glass substrate to form a 34nm thick transparent electrode.

[0137] 2. The ITO surface prepared above was treated with plasma oxygen etching, followed by plasma deposition of a 1.0 nm layer of fluorocarbon polymer (CFx) as described in US-A-6,208,075.

[0138] 3. At about 10 -6 The substrate prepared above was further processed by vacuum deposition under Torr vacuum to deposit 170 nm 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB ) hole transport layer.

[0139] 4. The substrate prepared above was removed from the vacuum and exposed to air for about 5 minutes before being placed in a nitrogen oven.

[0140] 5. Prepare a donor substrate by vacuum coating 40 nm of chr...

Embodiment 2

[0149] Embodiment 2 (comparative example)

[0150] OLED devices were fabricated using the method described in Example 1, except for step 11 (depositing an electron transport layer) as follows:

[0151] 11. A 35 nm electron transport layer of tris(8-quinolinate)aluminum(III) (ALQ) was vacuum deposited on the substrate with a coating station including a heated boat source.

[0152] result

[0153] Example

[0154] The device without doped low work function metal organic layer (Example 2) has significantly shorter half-life and higher voltage than the device with doped low work function metal organic layer (Example 1). Adding a lithium dopant to the electron transport layer increases the half-life by more than 2 times (Example 2 compared to Example 1), thus improving the stability of the device.

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PUM

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Abstract

A method of forming an organic light-emitting device with improved stability including forming an anode over a substrate, providing a cathode spaced from the anode, and providing a donor element including light-emitting material and positioning such donor element in a material-transferring relationship with the substrate. The method further includes illuminating the donor element with radiation to cause the transfer of light-emitting material to deposit the light-emitting material to form an emissive layer over the anode, and forming an organic layer including an organic compound doped with a low work function metal or metal compound capable of acting as a donor dopant between the emissive layer and the cathode to lower the electron-injecting barrier from the organic layer into the emissive layer thereby improving the stability of the organic light-emitting device.

Description

technical field [0001] The present invention relates to organic electroluminescent (EL) devices, also known as organic light emitting diodes (OLEDs) emitting colored light. Background technique [0002] Color or full-color organic electroluminescent (EL) displays (also known as organic light-emitting diode devices, or OLED devices) have an array of colored pixels, such as red, green, and blue pixels (often called RGB pixels), that produce Accurate patterning of organic EL media of color requires generation of RGB pixels. Basic OLED devices have an anode, a cathode, and an organic EL medium sandwiched between the anode and cathode. The organic EL medium may consist of one or more organic thin film layers, one of which is mainly used for light generation or electroluminescence. This particular layer is generally referred to as the emissive layer or light emitting layer of the organic EL medium. Other organic layers in organic EL media can provide basic electron transport fu...

Claims

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Application Information

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IPC IPC(8): H05B33/10C09K11/06H01L51/00H01L51/30H01L51/40H01L51/50H01L51/56H05B33/14H05B33/26
CPCH01L51/5052C09K2211/1029H01L51/0059C09K2211/1003H01L51/0085H01L51/0077H01L51/0013H01L51/0052H01L51/56H01L51/002C09K2211/1007H05B33/14C09K11/06H01L51/0062C09K2211/1088C09K2211/1014H10K71/18H10K71/30H10K85/615H10K85/649H10K85/631H10K85/30H10K85/342H10K50/165B29C37/04B26D1/04H10K71/00
Inventor M·L·博罗森L·-S·廖
Owner EASTMAN KODAK CO
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