Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/75710
Title: Diphenylphosphine oxide-based host materials for green phosphorescent organic light-emitting devices
Authors: Yang, TT
Xu, HX
Xi, ZY
Wang, KX
Tao, P
Sun, P
Zhao, B
Miao, YQ
Lian, H
Wang, H
Xu, BS
Wong, WY 
Keywords: Diphenylphosphine oxide
PhOLED
Host material
Phosphorescence
Issue Date: 2017
Publisher: Elsevier
Source: Dyes and pigments, 2017, v. 146, p. 582-588 How to cite?
Journal: Dyes and pigments 
Abstract: Two novel host materials based on the diphenylphosphine oxide (DPPO) and spirofluorene were designed, and facilely synthesized by tuning the ratio of donor spirofluorene units and acceptor DPPO units from 1: 1 to 1: 2, i.e., (4-(9,9'-spirobi[fluoren]-2-yl)phenyl)diphenylphosphine oxide (SPDPPO) and (9,9'-spirobi[fluorene]-2,7-diyIbis(4,1-phenylene))bis(diphenylphosphine oxide) (SBPBDPPO). Further-more, 3,6-disubstituted spirofluorene possesses better thermal stability performance, for instance, higher glass transition temperatures (SPDPPO of 140 degrees C and SBPBDPPO of 172 degrees C). The phosphorescent organic light-emitting devices (PhOLEDs) were fabricated by doping tris(2-phenylpyridine)iridium (Ir(ppy)(3)) in hosts as light-emitting layer. The PhOLEDs employed SPDPPO as host exhibited a low turn on voltage of 3.0 V and the maximum current efficiency of 36.5 cd/A, power efficiency of 32.8 Im/W and a maximum external quantum efficiency (EQE) of 10.5%, respectively.
URI: http://hdl.handle.net/10397/75710
ISSN: 0143-7208
EISSN: 1873-3743
DOI: 10.1016/j.dyepig.2017.07.050
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