Performance-improved white organic luminescent device

A device and organic technology, applied in the field of organic light-emitting OLED devices, can solve problems such as changes in the color of emitted light and difficult process control

Inactive Publication Date: 2004-05-12
EASTMAN KODAK CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these OLED devices require a very small amount of dopant concentration, and the process is difficult to control in large-scale manufacturing.
At the same time, the emitted light color changes due to small changes in dopant concentration

Method used

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  • Performance-improved white organic luminescent device
  • Performance-improved white organic luminescent device
  • Performance-improved white organic luminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0191] The device of Example 1 was prepared by sequentially depositing a 150 nm NPB hole transport layer (HTL), a 20 nm blue light emitting layer (LEL) of a TBADN matrix containing 2% TBP blue dopant, a 37.5 nm Alq electron transport layer (ETL), and then 0.5nm LiF and 200nm Al as part of the cathode. The above sequence completes the deposition of the OLED device.

[0192] Then the OLED device was sealed and packaged in a nitrogen-filled dry glove box to isolate the surrounding environment. The ITO patterned substrates used to fabricate OLED devices included several experimental patterns. Each device was tested for its volt-ampere characteristic curve and electroluminescence yield.

[0193] according to image 3 Devices of Examples 2-6 were prepared with the structure of OLED 300 shown in . A 150 nm thick NPB hole transport layer was doped with varying amounts of rubrene at a concentration of 1-5%. The device of Example 1 was found to have emission in the blue region of t...

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PUM

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Abstract

An organic light-emitting diode (OLED) device which produces substantially white light including a substrate, an anode disposed over the substrate, and a hole injecting layer disposed over the anode. The device also includes a hole-transporting layer disposed over the hole injecting layer, a blue light-emitting layer doped with a blue light-emitting compound disposed directly on the hole-transporting layer, and an electron-transporting layer disposed over the blue light-emitting layer. The device further includes a cathode disposed over the electron-transporting layer and the hole-transporting layer or electron-transporting layer, or both the hole-transporting layer and electron-transporting layer, being selectively doped with super rubrene or derivatives thereof which emits light in the yellow region of the spectrum which corresponds to an entire layer or a partial portion of a layer in contact with the blue light-emitting layer.

Description

technical field [0001] The present invention relates to organic light-emitting OLED devices that produce white light. Background technique [0002] An OLED device includes a substrate, an anode, a hole transport layer composed of an organic compound, an organic light-emitting layer with suitable dopants, an organic electron transport layer, and a cathode. OLED devices are attractive because of their low driving voltage, high luminance, wide viewing angle, and possibility as full-color flat-emitting displays. Such multilayer OLED devices are described by Tang et al. in US-A-4,769,292 and US-A-4,885,211. [0003] Efficient white light-generating OLED devices are considered as low-cost alternatives for several applications such as extremely thin light sources, backlights for LCD displays, automotive dome lights, and office lighting. OLED devices that produce white light should be bright, efficient, and typically have chromaticity coordinates of about (0.33, 0.33) from the Int...

Claims

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Application Information

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IPC IPC(8): H01L31/12C09K11/06H01L27/32H01L51/30H01L51/50H05B33/12
CPCH01L51/0081C09K2211/1044H01L51/0059C09K2211/1037Y02B20/181H01L51/0052H01L51/5048C09K2211/1007C09K2211/1003H01L51/0058C09K2211/1014H01L2251/308H01L51/0062H01L27/3211H01L51/5036H01L51/008C09K11/06H01L51/0054C09K2211/1059C09K2211/1029C09K2211/1011C09K2211/107Y10T428/26Y02B20/00H10K59/351H10K85/649H10K85/622H10K85/626H10K85/631H10K85/615H10K85/322H10K85/324H10K50/125H10K50/14H10K2102/103H01L31/12
Inventor T·K·哈特瓦Y·哈马达
Owner EASTMAN KODAK CO
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