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Electroluminescence and Laser Emission of Soluble Pure Red Fluorescent Molecular Glasses Based on Dithienylbenzothiadiazole
Author(s) -
Huang Ju,
Liu Quan,
Zou JianHua,
Zhu XuHui,
Li AiYuan,
Li JunWen,
Wu Sha,
Peng Junbiao,
Cao Yong,
Xia Ruidong,
Bradley Donal D. C.,
Roncali Jean
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200900365
Subject(s) - materials science , electroluminescence , lasing threshold , thiophene , fluorescence , laser , analytical chemistry (journal) , photochemistry , benzothiophene , toluene , substituent , luminescence , optoelectronics , optics , organic chemistry , nanotechnology , chemistry , layer (electronics) , wavelength , physics
Soluble molecular red emitters 1a / 1b are synthesized by Stille coupling from 2‐(3,5‐di(1‐naphthyl)phenyl)thiophene precursors. The compounds show emission maxima at ca. 610 nm in CH 2 Cl 2 solution and 620 nm in solid films. Replacing the n ‐hexyl substituent by 4‐ sec ‐butoxyphenyl produces a marked increase of glass transition temperature ( T g ) from 82 °C to 137 °C and increases the solubility in toluene and p ‐xylene, thus improving the film‐forming properties. Cyclic voltammetry shows that the compounds can be reversibly oxidized and reduced around +1.10 and −1.20 V, respectively. A two‐layered electroluminescent device based on 1b 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 1b successfully produces a lasing emission at ca. 650 nm.