Mechanism of charge generation in p-type doped layer in the connection unit of tandem-type organic light-emitting devices

Gao, X. D.; Zhou, J.; Xie, Z. T.; Ding, B. F.; Qian, Y. C.; Ding, X. M.; Hou, X. Y.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p083304
Academic Journal
A p-type doped organic layer combined with a hole-blocking layer has been experimentally demonstrated to serve as the charge generation unit in tandem-type organic light-emitting devices. The p-type layer functions as the source of both holes and electrons. Charge separation is explained by the tunneling model that the hole-blocking layer reduces the energy barrier for the electrons generated in the p-type layer to tunnel through into one light-emitting unit, while the holes generated in the p-type layer can transport to the other light-emitting unit easily under operation voltage.


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