Light emitting diode with blue light and red light emitting poly

Details Light emitting diode with blue light and red light emitting poly Light emitting diode with blue light and red light emitting poly

1998-07-02

2000-10-03

Tran, Minh Loan

Active solid-state devices (e.g., transistors, solid-state diode

Organic semiconductor material

257103, 313504, H01L 3300, H01L 3524

Patent

active

061276936

ABSTRACT:
The invention provides a novel polymer light-emitting diode (LED) which can emit near white light with a broad spectrum, which LED comprises a transparent electrode as an anode, a metal electrode as a cathode, an organic light-emitting layer, and a hole transport layer and/or an electron transport layer, wherein the organic light-emitting layer contains a blend of a blue light-emitting poly (paraphenylene vinylene) copolymer and a red light-emitting alkoxy-substrituted PPV derivative in an appropriate relative ratio, such that, the novel LED can emit sun light-like yellowish white light with an broad electroluminescent spectrum covering the whole range of visible light without varying as the voltage increased. And wherein, by virture of introducing a hole transport layer and/or electron transport layer, the turn-on voltage of the device can be lowered and emission efficiency thereof is increased.

REFERENCES:
patent: 5247190 (1993-09-01), Friend et al.
patent: 5401827 (1995-03-01), Holmes et al.
patent: 5408109 (1995-04-01), Heeger et al.
patent: 5425125 (1995-06-01), Holmes et al.
patent: 5514878 (1996-05-01), Holmes et al.

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