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Indexed by:期刊论文

Date of Publication:2012-07-01

Journal:DYES AND PIGMENTS

Included Journals:SCIE、EI

Volume:94

Issue:1

Page Number:136-142

ISSN No.:0143-7208

Key Words:Dendrimer; Polyphenylene dendron; Spirobifluorene; Amorphous; High glass transition temperature

Abstract:Two novel spirobifluorene-cored dendrimers containing polyphenylene dendrons with the carbazole (spiro-Cz) and cyano surface groups (spiro-CN) were synthesized and characterized. Both the dendrimers show good solubility in common organic solvents. Spiro-Cz is amorphous even when it is obtained directly from organic solvents and an extremely high glass transition temperature of 332 degrees C is detected. These dendrimers can be reversibly oxidized and reduced in electrochemical measurements. They are blue fluorescent with small red-shift in solid film absorption and fluorescence spectra. These advantageous merits are suggested to benefit from the combined contribution from the spirobifluorene core and the bulky polyphenylene dendrons. They were used as emitting layer to fabricate organic light-emitting diodes (OLEDs). Deep-blue electroluminescence was obtained for both dendrimers devices. (C) 2011 Elsevier Ltd. All rights reserved.