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P‐162: Application of Mixed Host and Hole‐Blocking for High‐Efficiency White Organic Light‐Emitting Diodes
Author(s) -
Shieh TienShou,
Lin JinSheng,
Liu PeyChing,
Tseng MeiRurng
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 - 10.1889/1.3256667
Subject(s) - phosphorescence , iridium , oled , dopant , chemistry , doping , diode , phosphorescent organic light emitting diode , optoelectronics , materials science , layer (electronics) , fluorescence , optics , organic chemistry , physics , catalysis
Abstract This paper was to develop charge‐confining phosphorescent white organic light emitting diodes (WOLEDs) based on mixed host (TCTA and CzSi) and hole‐blocking (TPBi and BPhen) layers. The blue phosphorescent sensitizer was Bis(3,5‐ difluoro‐ 2‐(2‐pyridyl)phenyl‐(2‐carboxypyridyl) iridium (Firpic), and the orange phosphorescent sensitizer was the thieno‐pyridine framework organo‐iridium complexes (PO‐01). The sandwiched structures of the blue/orange/blue with different TPBi dopant ratio in BPhen were compared. The WOLEDs of the EL‐I series were all mixed‐host for emitting layer, but the emitting layer of the EL‐II series were without mixed‐host at the second blue one. The efficiency of WOLEDs of the EL‐I device at 4.3% TPBi dopant ratio in the BPhen was 34.1lm/W at 1000 cd/m 2 . However, the efficiency of WOLEDs of the EL‐II series did't raise the device's characteristics when the TPBi is doped in BPhen, and WOLEDs of the EL‐II series responded insensitively to drive current. They were good suitability to use in OLED lighting.