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Indexed by:Journal Papers
Date of Publication:2015-11-01
Journal:DYES AND PIGMENTS
Included Journals:SCIE、EI、Scopus
Volume:122
Page Number:295-301
ISSN No.:0143-7208
Key Words:OLEDs; Deep blue; Carbazole; Dendrimer; Oligofluorene core; Solution-processing
Abstract:A group of novel dendrimers containing an oligofluorene core and oligo-carbazole dendrons, were synthesized by a Suzuki cross-coupling reaction. The dendrimers exhibit excellent thermal and amorphous stabilities, and emit deep blue fluorescence with high quantum yields of over 85%. These molecules have non-planar molecular conformations and thus possess excellent solubility and film-forming ability by solution-processing techniques. The dendrimers are used as hole-transporting emitting layers to fabricate organic light-emitting diodes (OLEDs) by a spin coating process. Bright deep blue electroluminescence is obtained with CIE coordinates of ca. (0.16, 0.09), which are quite close to the National Television System Committee (NTSC) standard blue coordinates of (0.14, 0.08). Maximum luminances were in the range of 388-711 cd m(-2) and maximum luminance efficiencies were in the range of 0.91-1.07 cd A(-1) for the derived devices. (C) 2015 Elsevier Ltd. All rights reserved.
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