Organic electric luminescent device emitting white light with Improved efficiency and stability

A device and organic technology, applied in the field of organic light-emitting devices, can solve the problems of low dopant concentration and difficult process control, and achieve the effect of low driving voltage and high operational stability
CN1340865AInactive Publication Date: 2002-03-20GLOBAL OLED TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GLOBAL OLED TECH
Publication Date
2002-03-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

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

field of invention

[0001] The present invention relates to organic light emitting devices (OLEDs) that produce white light. Background technique

[0002] An OLED device includes a substrate, an anode, a hole transport layer made of an organic compound, an organic light-emitting layer containing a suitable dopant, an organic electron transport layer, and a cathode. OLED devices are attractive because of their low drive voltage, high brightness, wide viewing angle, and ability to have full-color planar emissive displays. Such multilayer OLED devices are described in US 4,769,292 and 4,885,211.

[0003] OLED devices that efficiently produce white light are considered as low-cost replacements for several applications, such as paper-thin backlights in LCD displays, automotive blinkers, and office lighting. OLED devices that produce white light should be bright, efficient, and generally should have Committee d'Eclairage International (CIE) chromaticity coordinates of about (0.33...

Claims

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