Polymer-based electroluminescent device with improved stability

Details Polymer-based electroluminescent device with improved stability Polymer-based electroluminescent device with improved stability

1995-06-06

1997-05-13

Morris, Terrel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525540, 362800, 257 80, 257 83, 252500, C08F28300, H01B 100, H01L 2715, H01L 3112

Patent

active

056293895

ABSTRACT:
An improved electroluminescent device which includes a hole injection electrode, an electron injection electrode, and an electroluminescent layer located between the hole and electron injection electrodes. The electroluminescent layer includes an organic polymer and a hindered phenolic additive in a concentration greater than 4% by weight. The preferred organic polymer is a derivative of PPV. The preferred hindered phenolic additives are and 2,4,6 tri-tert-butyl phenol 2,6 di-tert-butyl-methylphenol. The device has higher efficiency and a slower rate of degradation than devices lacking the hindered phenolic additive.

REFERENCES:
patent: 5401827 (1995-03-01), Holmes et al.
patent: 5424560 (1995-06-01), Norman et al.
patent: 5504323 (1996-04-01), Heeger et al.
Synthetic Metals: "Plastic LED: A Flexible Light-Emitting Device Using a Polyaniline Transparent Electrode"; Gustafsson et al. Apr. 1993.
Electric Vehicles: "Conducting Polymers Could Lead to Lightweight Plastic Batteries for EVs"; Battery & EV Technology, Business Communications Company, Inc. Jul. 1992.

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