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Bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane as Electron-Transport Material for Deep Blue Phosphorescent OLEDs

Authors
Kwon, SoonnamWee, Kyung-RyangKim, Ae-LiKang, Sang Ook
Issue Date
Jan-2010
Publisher
AMER CHEMICAL SOC
Keywords
Electron transport; Hard matter; Optical and electronic devices
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.1, no.1, pp.295 - 299
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume
1
Number
1
Start Page
295
End Page
299
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/117280
DOI
10.1021/jz900238h
ISSN
1948-7185
Abstract
Bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane (SiTAZ) was designed and synthesized as an electron transporting material for deep blue phosphorescent organic light-emitting devices (PHOLEDs). Introducing a Si atom between two 3,4,5-triphenyl-1,2,4-triazole molecules, a high triplet energy of 2.84 eV, high glass transition temperature of 115 C, and high electron mobility of 6.2 x 10(-4) cm(2) V-1 s(-1) were achieved. By employing SiTAZ as a hole-blocking and electron-transporting material of iridium(III)[bis(4,6-difluorophenyl)pyridinato-N,C-2']tetrakis(1-pyrazolyl)borate (FIr6)-based deep blue phosphorescent OLEDs, a maximum external quantum efficiency (EQE) of 15.5%, an EQE of 13.1% at high luminance of 1000 cd m(-2), and deep blue color coordinates of (0.16, 0.22) were achieved. The reduced efficiency roll-off at high luminance was attributed to the high triplet energy of the SiTAZ.
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