High efficiency phosphorescent blue organic light-emitting diodes using double emitting layer

Jung Sun Park, Ji Hoon Seo, Ja Ryong Koo, Bo Min Seo, Kum Hee Lee, Seung Soo Yoon, Young Kwan Kim
Journal of Nanoscience and Nanotechnology 2011, 11 (5): 4488-91
We have demonstrated a highly efficient blue phosphorescent organic light emitting diodes (PHOLED) using iridium (111) bis[(4,6-di-fluoropheny)-pyridinato-N,C2] picolinate doped in double emitting layers (D-EML), N,N-dicarbazolyl-3,5-benzene (mCP) and p-bis (triphenylsilyly)benzene (UGH2). D-EML layers were employed to broaden the exciton formation zone and confine excitons. The optimized blue PHOLEDs having mCP/UGH2 as D-EML with a thickness of 200/100 A, exhibited a peak external quantum efficiency of 11.44%, power efficiency of 16.8 Im/W, luminous efficiency of 23.14 cd/A, and Commission Internationale de l'Eclairage coordinates of (0.17, 0.33).

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