期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 29, 期 8, 页码 659-664出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200700847
关键词
conjugated materials; light-emitting diodes (LED); morphology; photoluminescence; solar cells; starbursts
A series of starburst materials (T1-T3) based on a pyrene core with four oligofluorene arms of different length have been synthesized and characterized. The starburst materials show good film forming ability and sky blue fluorescence. Electroluminescent devices take on a stable blue emission and the device performance increases with an increase in arm length. The single-layered device made of T3 has a maximum brightness of over 2 700 cd. m(-2) and a maximum current efficiency of 1.75 cd . A(-1), which is among the best in starburst material devices. The morphology of T1-T3 has been studied by atomic force microscopy. The starburst oligofluorenes with different arm lengths show a distinctive texture, which indicates the size dependent morphology of the starburst materials.
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