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Sunghun Lee, Jeong-Hwan Lee, Jae-Hyun Lee and Jang-Joo Kim Organic Light-Emitting Diodes: The Mechanism of Charge Generation in Charge-Generation Units Composed of p-Doped Hole-Transporting Layer/HATCN/n-Doped Electron-Transporting Layers (Adv. Funct. Mater. 4/2012) Advanced Functional Materials 22

Article first published online: 15 FEB 2012 | DOI: 10.1002/adfm.201290023

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A tandem white organic light-emitting diode (OLED) composed of blue and orange emitting units interconnected by a charge-generation unit (CGU) in which both electrons and holes are efficiently generated is presented. On page 855, Jang-Joo Kim and co-workers analyze the charge generation mechanism of the CGU composed of p-doped hole-transporting layer (HTL)/1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HATCN)/n-doped electron-transporting layer (ETL). The energy level alignment shows that the electron injection at the HATCN/n-ETL junction limits the charge generation in the CGU.

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