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High efficiency blue phosphorescent organic light emitting diodes using a simple device structure
5.M. Tsai, Y. Hong, C. Chang, H. Su, C. Wu, A. Matoliukstyte, J. Simokaitiene, S. Grigalevicius, J. V. Grazulevicius, and C. Hsu, Adv. Mater. (Weinheim, Ger.) 19, 862 (2007).
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High efficiency blue phosphorescent organic light emitting diodes have been developed by using a simple device structure. A derivative of spirobifluorene based phosphine oxide was used both as a host and an electron transport layer with an exciton blocking function. A maximum quantum efficiency of 19.2% and a current efficiency of were obtained by using a simple device structure without a hole blocking layer.
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