Electroluminescence and laser emission of soluble pure red fluorescent molecular glasses based on dithienylbenzothiadiazole

Ju Huang, Quan Liu, Jian Hua Zou, Xu Hui Zhu, Ai Yuan Li, Jun Wen Li, Sha Wu, Junbiao Peng, Yong Cao, Ruidong Xia, Donal D.C. Bradley, Jean Roncali

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64 Scopus citations

Abstract

Soluble molecular red emitters la/lb are synthesized by Stille coupling from 2-(3,5-di(l-naphthyl)phenyl)thiophene precursors. The compounds show emission maxima at ca. 610 nm in CH2Cl2 solution and 620 nm in solid films. Replacing the n-hexyl substituent by 4-sec-butoxyphenyl produces a marked increase of glass transition temperature (Tg) from 82 °C to 137 °C and increases the solubility in toluene and p-xylene, thus improving the filmforming properties. Cyclic voltam metry shows that the compounds can be reversibly oxidized and reduced around +1.10 and -1.20V, respectively. A two-layered electroluminescent device based on lb produces a pure red light emission with CIE coordinates (0.646, 0.350) and a maximal luminous efficiency of 2.1 cd A-1. Furthermore, when used as a solution-processed red emitter in optically pumped laser devices, compound lb successfully produces a lasing emission at ca. 650 nm. © 2009 WILEY-VCH Verlag GmbH & Co. KCaA.
Original languageEnglish (US)
JournalAdvanced Functional Materials
Volume19
Issue number18
DOIs
StatePublished - Sep 23 2009
Externally publishedYes

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