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ORGANIC THIN FILM ELECTROLUMINESCENCE POLYMER LIGHT EMITTING DIODES WITH HETEROJUNCTION

Zhang Tiequn, Wang Xiaoyong, Tan Haishu, Wang Zhi, Yang Songtao, Liu Xiuluan (Institute of Modern Optics, Nankai University, Tianjin, 300071) (Opto electronic Information Science and Technology Laboratory, Ministry of Education, Tianjin, 300071)  
This paper present the results of organic polymer heterostucture light emitting diodes composed of a layer of electron transporting material poly (phenyl quinoxaline) (PPQ) and a layer of hole transporting material poly (2,5 didodecyloxy 1,4 phenylene vinylene) (PDDOPV). Though the turn on voltage of the bilayer device is higher than that of the single layer device of PDDOPV, the current density is lowered more than one order and the brightness is enhanced by nearly two orders.
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