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23.4: Invited Paper : Ideal Host‐Dopant System for Highly Efficient Phosphorescent OLEDs
Author(s) -
Kwon Jang Hyuk,
Jeon Woo Sik,
Park Tae Jin
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256774
Subject(s) - phosphorescence , dopant , oled , doping , exciton , materials science , fluorescence , phosphorescent organic light emitting diode , optoelectronics , quantum efficiency , nanotechnology , physics , optics , condensed matter physics , layer (electronics)
Using a narrow band‐gap fluorescent host material with a phosphorescent red dopant, highly efficient red phosphorescent OLEDs (PHOLEDs) exhibiting an ideal external quantum efficiency with a doping concentration of 1% were developed. The origin of such a low doping is revealed by the ideal Dexter doping condition study for efficient energy transfer in PHOLEDs. Besides this cause, the strong fluorescent host materials function very well in phosphorescent OLEDs. Singlet excitons generated by fluorescent host materials in phosphorescent OLEDs can produce dopant triplet excitons via the efficient Förster energy transfer mechanism.