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External Quantum Efficiency Above 20% in Deep Blue Phosphorescent Organic Light‐Emitting Diodes
Author(s) -
Jeon Soon Ok,
Jang Sang Eok,
Son Hyo Suk,
Lee Jun Yeob
Publication year - 2011
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.201004372
Subject(s) - phosphorescence , quantum efficiency , materials science , oled , phosphorescent organic light emitting diode , optoelectronics , diode , exciton , quantum , deep blue , photochemistry , optics , nanotechnology , physics , chemistry , fluorescence , condensed matter physics , layer (electronics) , quantum mechanics
Highly efficient deep blue phosphorescent organic light‐emitting diodes (PHOLEDs) with external quantum efficiency above 20% are developed using a bipolar‐type high‐triplet‐energy host material and a high‐triplet‐energy exciton blocking material. Maximum quantum efficiency of 25.1% and low roll‐off (still 23.1% at 1000 cd m −2 ) are achieved in these deep blue PHOLEDs.