Mr. Po-Sheng Wang Profile

Po-Sheng Wang

at National Taiwan Univ.

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Proceedings Article | 13 September 2012 Paper

Inverted OLEDs for flexible displays

Jang-Joo Kim, Jeong-Hwan Lee, Ji Whan Kim, Sei-Yong Kim, Seung-Jun Yoo, Po-Sheng Wang, Chih-I Wu

Proceedings Volume 8476, 84760G (2012) https://doi.org/10.1117/12.977831

KEYWORDS: Organic light emitting diodes, Electrodes, Electron transport, External quantum efficiency, Interfaces, Organic electronics, Flexible displays, Oxides, Aluminum, Transistors

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We reported a couple of methods to improve electron injection from the ITO electrode, thereby to fabricate efficient inverted bottom emission organic light emitting diodes (IBOLEDs). The first method is to use an n-doped electron transporting layer (ETL) as the electron injection layer. Electron only device characteristics and UPS measurements confirmed that B3PYMPM homo-junction has the lowest injection barrier at the interface among three different ETLs, resulting in the highest maximum EQE of 19.8% at low voltage in IBOLEDs. The energy barrier between n-ETL and ETL is one of the most important factors for high performance inverted OLEDs. The second method is to use an organic p-n junction as an electron injection layer, where the p-n junction generated electrons and holes under reverse bias, which corresponds to the forward bias in the OLEDs. The organic p-n junction composed of a p-CuPc/n-Bphen layer shows almost the same electron injection characteristics for the cathodes with different work functions whereas the injection characteristics of the n-Bphen EIL significantly depend on the work function of the cathode. These facts indicate that the organic p-n junction can be efficiently applied as an electron injection layer for high performance flexible organic electronics, regardless of the electrodes.

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