Open Access Nano Express

Exciplex electroluminescence and photoluminescence spectra of the new organic materials based on zinc complexes of sulphanylamino-substituted ligands

Mikhail G Kaplunov*, Svetlana S Krasnikova, Sergey L Nikitenko, Natalia L Sermakasheva and Igor K Yakushchenko

Author Affiliations

Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, Russia

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Nanoscale Research Letters 2012, 7:206  doi:10.1186/1556-276X-7-206

Published: 3 April 2012

Abstract

We have investigated the electroluminescence spectra of the electroluminescent devices based on the new zinc complexes of amino-substituted benzothiazoles and quinolines containing the C-N-M-N chains in their chelate cycles. The spectra exhibit strong exciplex bands in the green to yellow region 540 to 590 nm due to interaction of the excited states of zinc complexes and triaryl molecules of the hole-transporting layer. For some devices, the intrinsic luminescence band of 460 nm in the blue region is also observed along with the exciplex band giving rise to an almost white color of the device emission. The exciplex band can be eliminated if the material of the hole-transporting layer is not a triarylamine derivative. We have also found the exciplex emission in the photoluminescence spectra of the films containing blends of zinc complex and triphenylamine material.