A new benzimidazole/carbazole hybrid bipolar material for highly efficient deep-blue electrofluorescence, yellow-green electrophosphorescence, and two-color-based white OLEDs

The bipolar molecule CPhBzIm exhibits an excellent solid state photoluminescence quantum yield ( Φ PL = 69%), triplet energy ( E T = 2.48 eV), and bipolar charge transport ability ( μ h μ e 10 −6 -10 −5 cm 2 V −1 s −1 ). We have used it to fabricate a non-doped deep-blue organic light emitting diode...

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Bibliographic Details
Published in:Journal of materials chemistry 2010-01, Vol.2 (45), p.1113-1119
Main Authors: Hung, Wen-Yi, Chi, Liang-Chen, Chen, Wei-Jiun, Chen, You-Ming, Chou, Shu-Hua, Wong, Ken-Tsung
Format: Article
Language:English
Subjects:
Carbazoles
Charge transport
Light-emitting diodes
Photoluminescence
Solid state
Vanadium
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Summary:The bipolar molecule CPhBzIm exhibits an excellent solid state photoluminescence quantum yield ( Φ PL = 69%), triplet energy ( E T = 2.48 eV), and bipolar charge transport ability ( μ h μ e 10 −6 -10 −5 cm 2 V −1 s −1 ). We have used it to fabricate a non-doped deep-blue organic light emitting diode (OLED) exhibiting promising performance [ η ext = 3%; CIE = (0.16, 0.05)] and to serve as host material for a yellow-green phosphorescent OLED [ η ext = 19.2%; CIE = (0.42, 0.56)]. Exploiting these dual roles, we used CPhBzIm in a simple singly doped, two-color-based white OLED ( η ext = 7%; CIE = 0.31, 0.33). A simple singly doped, two-color-based white OLED was achieved by exploiting the dual roles of CPhBzIm as a deep-blue emitter and a host material for Ir-based yellow-green phosphorescence.
ISSN:0959-9428
1364-5501
DOI:10.1039/c0jm02143a