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P‐223: Enhanced Power Efficiency of Single‐Layer White Triplet Polymer Light‐Emitting Diodes by Blending with Polymer Oxides
Author(s) -
Chen YungShiuan,
Chien ShangChieh,
Chen FangChung,
Lian JanTian,
Tsou ChienLung,
Mo ChiNeng
Publication year - 2008
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 - 10.1889/1.3069604
Subject(s) - phosphorescence , materials science , diode , optoelectronics , polymer , quantum efficiency , layer (electronics) , ethylene glycol , nanotechnology , optics , chemical engineering , composite material , fluorescence , physics , engineering
In this study, we have demonstrated enhanced performance of blue, red and white phosphorescent polymer light‐emitting diodes PLEDs) by blending poly(ethylene glycol) (PEG) into the active layer of the devices. By introducing PEG into the PLEDs, the turn‐on voltages of these devices became lower than those of the conventional devices. In addition, the luminance efficiency and the external quantum efficiency of the blue and white phosphorescent PLEDs were both improved. Most important of all, because of the lower operating voltage, the higher power efficiency (7.3 lm/W, 1.5 lm/W, 4.6lm/W) of the blue, red and white phosphorescent PLEDs than those of the control devices (2.9 lm/W, 1.1 lm/W, 1.9 lm/W) have been achieved, respectively. Finally, the improvement mechanism will be discussed.