JOURNAL ARTICLE

Enhanced efficiency of blue phosphorescent organic light-emitting diode base on triple-emitting layer with mixed host system

Dong Hwan Lim, Seok Jae Lee, Hyun Su Shin, Dong Hyung Lee, Kum Hee Lee, Woo Young Kim, Seung Soo Yoon, Young Kwan Kim
Journal of Nanoscience and Nanotechnology 2014, 14 (8): 6056-9
25936056
We report an improvement of efficiency in blue phosphorescent organic light-emitting diodes (PHOLEDs) based on triple-emitting layer (T-EML) with mixed host (MH) system using a phosphorescent blue emitter: iridium(III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2]picolinate (Flrpic) doped in N,N'-dicarbazolyl-3,5-benzene (mCP) of hole transport-type host material and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) of electron transport-type host material. This T-EML device resulted in both an effective electron and hole balance and efficient distribution of the recombination zone. As a result, the property of T-EML device which demonstrated a maximum luminous efficiency of 24.45 cd/A and a external quantum efficiency of 10.9%. It also showed a high maximum power efficiency of 13.82 lm/W, which is approximately two times higher than that of the control device.

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