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Synthesis of Poly(N-aryl-2,7-carbazole)s for Efficient Blue Electroluminescence Materials

✍ Scribed by Ryohei Koguchi; Norifumi Kobayashi; Toshinobu Shinnai; Kazuma Oikawa; Kazuhiko Tsuchiya; Masashi Kijima

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
239 KB
Volume
209
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Several poly(N‐phenyl‐2,7‐carbazole)s that have dialkoxy groups at the m‐ and p‐positions (P__mp__CzDC, P__mp__PhDC, P__mp__CBiDC, P__mp__EHC), a silyl group at the p‐position (P__p__PhDSiC), and a diphenylamino group (P__m__PhDAC, P__m__EHAC) at the m‐position of the N‐phenyl portion are synthesized, and their optical properties are characterized. These polymers have been used as emitting layer materials of organic light‐emitting diode (OLED) devices that have a configuration of ITO/PEDOT(PSS)/polymer/CsF/Al. The OLED devices embedded with P__mp__CzDC, P__mp__PhDC, and P__mp__EHC show intense luminance of about 15 000 cd · m^−2^ with efficiencies of about 1 cd · A^−1^, while the devices embedded with P__p__PhDSiC, P__m__PhDAC, and P__m__EHAC show less luminance but retain the color purity of blue emission under a wide range of applied voltages.

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