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3576251 
Journal Article 
Spiro-annulated hole-transport material outperforms NPB with higher mobility and stability in organic light-emitting diodes 
Chen, Hua; Gao, CH; Jiang, Z; Zhang, Lei; Cui, L; Ji, S; Liao, LS 
2014 
Yes 
Dyes and Pigments
ISSN: 0143-7208
EISSN: 1873-3743 
107 
15-20 
WOS:000336828900003 
A novel multifunctional spiro-annulated fluorene/triarylamine based compound (STNPB) has been designed, synthesized and characterized. It exhibits a high glass transition temperature of 140 degrees C, due to the rigid spiro-configuration molecular structure. According to its suitable energy level and triplet energy (2.34 eV), improved performances, such as lower driving voltage, enhanced device power efficiency, and longer stability, are shown in organic light-emitting diodes with STNPB as the hole-transport material, compared with the ones with the widely used arylamine derivative N,N'-bis(naphthalen-l-y1)-N,N'-bis(phenyl)-benzidine (NPB). Through further studies, it has been demonstrated that the enhanced stability is attributed to suppressed crystallization process as a result of employing STNPB instead of NPB as the hole-transport material. (C) 2014 Elsevier Ltd. All rights reserved. 
Spiro-annulated structure; Electro-phosphorescence; Hole-transport material; Crystallization; Organic light-emitting diode; Triphenylamine