著者

深川 弘彦

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.58, no.3, pp.86-90, 2015 (Released:2015-03-27)

参考文献数

21

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Highly efficient and stable phosphorescent organic-light emitting diodes (PHOLEDs) were demonstrated in view of optimization of emitting and/or carrier transporting materials. The device characteristics of the red PHOLED was improved by selecting a host material, which surrounds the phosphorescent dopant. The host/dopant combination was found to be a crucial factor in obtaining high efficiency and stability in the PHOLEDs. On the other hand, the novel hole-transporting materials were synthesized to improve the efficiency and operational stability of green PHOLEDs. The optimized red and green OLEDs exhibit a maximum external quantum efficiency of about 20% and an expected half lifetime of over 10,000 h with an initial luminance of 1,000 cd/m2.