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P.121: Good Color Stable Phosphorescent White Organic Light‐Emitting Diodes with Double Emissive Layer Structure
Author(s) -
Son Young Hoon,
Kim Young Jae,
Park Mi Jin,
Kwon Jang Hyuk
Publication year - 2013
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 - 10.1002/j.2168-0159.2013.tb06515.x
Subject(s) - phosphorescence , oled , materials science , optoelectronics , diode , dopant , exciton , layer (electronics) , trapping , optics , fluorescence , doping , nanotechnology , physics , ecology , quantum mechanics , biology
We report good color stable phosphorescent white organic light‐emitting diodes (OLEDs) based on double emissive layer (EML) structure composed of blue and red/green phosphorescent units. Deep hole trapping situation of red and green dopants at the red/green EML could realize less voltage dependent white spectral characteristics by restricting the change of exciton generation zone. A wide band‐gap host material of 2,6‐bis(3‐(carbazol‐9‐yl)phenyl)pyridine (26DCzPPy) was used for such deep trapping generation. Fabricated phosphorescent white OLED has very slight color coordinates changes of (‐0.007, +0.006) from 1000 cd/m2 to 10000 cd/m 2 with power efficiency of 37.7 lm/W and current efficiency of 48.1 cd/A at 1000 cd/m2.