NDLI: Solution processed blue phosphorescent organic light emitting diodes using a Ge-based small molecular host

Content Provider	Royal Society of Chemistry (RSC)
Author	Xu, Xinjun Tian, Yuan Li, Lidong Wang, Jinshan Yao, Chuang Peng, Jinghong Liu, Ronghua Cui, Qianling
Copyright Year	2015
Abstract	Two kinds of host materials, 4,4′-(diphenylgermanediyl)bis(N,N-diphenylaniline) and bis(4-(9H-carbazol-9-yl)phenyl)diphenylgermane (DCzGe), for blue phosphorescent organic light emitting diodes (PhOLEDs) were designed by incorporating electron donating groups (carbazole and triphenylamine) into tetraphenylgermane, which is a new type of core moiety that has never been studied for use in this field. This molecular structure endows the compounds with a wide energy bandgap, high thermal/morphological stability and good solution processability. Based on the theoretic calculations, DCzGe was selected and synthesized as a host material which demonstrates a wide bandgap (Eg: 3.56 eV) and a high triplet energy (ET: 3.02 eV). It also exhibits a high glass transition temperature (110 °C), which is beneficial for resisting the Joule heat in devices. All solution processed, blue emitting PhOLEDs were fabricated by using a mixed host combining DCzGe and an electron-transporting material, with a maximum luminance of 10 000 cd m−2 and a maximum current efficiency of 15.2 cd A−1. Furthermore, the devices showed a very low current efficiency roll-off, which remained as high as 15.2 cd A−1 at the luminance of 1000 cd m−2, and the roll-off is only 2.6% even at the higher luminance of 2000 cd m−2.
Starting Page	5017
Ending Page	5025
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	3
Issue Number	19
Journal	Journal of Materials Chemistry C
DOI	10.1039/c5tc00612k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Joule Phenyl group Carbazole Triphenylamine Band gap Electronvolt Glass transition Joule heating
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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