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Blue Phosphorescent Organic Light‐Emitting Diodes Using an Exciplex Forming Co‐host with the External Quantum Efficiency of Theoretical Limit
Author(s) -
Shin Hyun,
Lee Sunghun,
Kim KwonHyeon,
Moon ChangKi,
Yoo SeungJun,
Lee JeongHwan,
Kim JangJoo
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201400955
Subject(s) - oled , phosphorescence , iridium , quantum efficiency , materials science , common emitter , optoelectronics , excimer , phosphorescent organic light emitting diode , diode , dipole , benzene , photochemistry , layer (electronics) , optics , nanotechnology , physics , chemistry , catalysis , fluorescence , quantum mechanics , biochemistry , organic chemistry
A high‐efficiency blue‐emitting organic light‐emitting diode (OLED) approaching theoretical efficiency using an exciplex‐forming co‐host composed of N,N′‐dicarbazolyl‐3,5‐benzene (mCP) and bis‐4,6‐(3,5‐di‐3‐pyridylphenyl)‐ 2‐methylpyrimidine (B3PYMPM) is fabricated. Iridium(III)bis[(4,6‐difluorophenyl)‐ pyridinato‐N,C2′]picolinate (FIrpic) is used as the emitter, which turns out to have a preferred horizontal dipole orientation in the emitting layer. The OLED shows a maximum external quantum efficiency of 29.5% (a maximum current efficiency of 62.2 cd A −1 ), which is in perfect agreement with the theoretical prediction.