Issue 12, 2011

Light-emitting poly(N-naphthyl-2,7-carbazole)

Abstract

A blue-emitting poly(2,7-carbazole) having a naphthyl substituent at the N-position (PNCz) was newly synthesised by the Yamamoto method and used to fabricate an organic light emitting diode (OLED). PNCz was highly soluble in common organic solvent with the number average molecular weight (Mn) of 17600 and good thermal stability, with the decomposition temperature higher than 390 °C. PNCz exhibited intense blue photoluminescence with emission peak maxima at 415 nm in CHCl3 and 428 nm in the film state, and the fluorescence quantum efficiency in CHCl3 was extremely high (Φfl = 0.99). The HOMO level estimated by cyclic voltammetry was −5.50 eV and the band gap estimated from an absorption edge was 2.72 eV. The OLED device with a configuration of ITO/PEDOT:PSS/PNCz/CsF/Al exhibited bluish emission with several hundreds cd m−2 and CIE index (x = 0.20, y = 0.21) at low operating voltages in the range of 6–7 V and greenish emission with about 3000 cd m−2 and CIE index (0.25, 0.44) under high operating voltage around 11 V.

Graphical abstract: Light-emitting poly(N-naphthyl-2,7-carbazole)

Article information

Article type
Paper
Submitted
23 Jun 2011
Accepted
21 Aug 2011
First published
10 Oct 2011

Polym. Chem., 2011,2, 2830-2834

Light-emitting poly(N-naphthyl-2,7-carbazole)

T. Mori, T. Shinnai and M. Kijima, Polym. Chem., 2011, 2, 2830 DOI: 10.1039/C1PY00286D

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