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7623611 
Journal Article 
Synthesis, characterization, physical properties, and blue electroluminescent device applications of phenanthroimidazole derivatives containing anthracene or pyrene moiety 
Zhuang, S; Shangguan, R; Huang, H; Tu, G; Wang, Lei; Zhu, X; , 
2014 
Yes 
Dyes and Pigments
ISSN: 0143-7208
EISSN: 1873-3743 
ELSEVIER SCI LTD 
OXFORD 
101 
93-102 
English 
WOS:000330819500013 
By introducing a highly fluorescent anthracene, 9-(naphthalen-2-yl)anthracene or pyrene unit at the N1-phenyl of 1,2-diphenyl-1H-phenanthro[9,10-d]imidazole, three novel blue-emissive materials (ANPI, 2-NaNPI and PNPI) were synthesized and characterized, of which HOMO and LUMO orbitals are specifically segregative. Their high luminescence efficiency and excellent stability render them promising materials in electroluminescent device. The undoped three layers device using PNPI exhibits a maximum current efficiency of 4.99 cd A(-1) with Commission Internationale d'Eclairage (CIEx,y)color coordinates of (x = 0.15, y = 0.17). Meanwhile, the property differences between N1-substituted and C2-substituted of diphenyl-1H-phenanthro[9,10-d]imidazole derivatives were studied. The results indicate that the change of conjugated position and moiety for those blue hosts can affect the electrical field polarization of device. Specifically, all the blue host materials containing anthracene moiety show an impressive luminous current efficiency around 12 cd A(-1) when doped with sky blue fluorescent material BUBD-1. (C) 2013 Elsevier Ltd. All rights reserved. 
Anthracene; Blue host material; High Tg; Organic light-emitting device; Phenanthro[9,10-d]imidazole; Pyrene