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Mechanism of charge generation in -type doped layer in the connection unit of tandem-type organic light-emitting devices
1.J. Kido and T. Hayashi, U.S. Patent No. 20030189401A1 (9 October 2003).
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A -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 -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 electronsgenerated in the -type layer to tunnel through into one light-emitting unit, while the holes generated in the -type layer can transport to the other light-emitting unit easily under operation voltage.
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