National Science Council of Republic of China

Shou-An Chen

Hsien-Kuang Lin

Kuen-Ru Chuang

En-Chung Chang

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.

Light emitting diode with blue light and red light emitting polymers

The invention relates to a water-soluble self-acid-doped polyaniline derivatives and in particular, to a water-soluble self-acid-doped polyaniline derivatives obtained by reacting polyaniline derivatives with 2-sulfobenzoic anhydride derivatives, which is composed of structural unit having following formula (I): ##STR1## wherein, M may be H, Na, K or NH.sub.4 ;

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Hsinchu, Taiwan

Shou-An Chen