Ortho-Fused Heterocyclic Derivatives as Efficient Electroluminescent Materials

We describe the synthesis and optical properties of 1,2-dithienylethylene derivatives (DTE-8–15) consisting of ortho-fused heterocyclic systems such as benzodithiophene and naphthothiophene. The compounds 8–13 are highly fluorescent in toluene solution and their intensities are approximately two tim...

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Bibliographic Details
Published inBulletin of the Chemical Society of Japan Vol. 75; no. 3; pp. 551 - 557
Main Authors Tanaka, Kazuhiko, Osuga, Hideji, Tsujiuchi, Naoki, Hisamoto, Masashi, Sakaki, Yuichi
Format Journal Article
LanguageEnglish
Published TOKYO The Chemical Society of Japan 01.03.2002
Chemical Soc Japan
Chemical Society of Japan
Subjects
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
LIGHT-EMITTING-DIODES
HETEROHELICENES
POLYMERS
OLIGOTHIOPHENE MOIETY
RESOLUTION
DEVICES
ORGANIC MATERIALS
AMORPHOUS MOLECULAR MATERIALS
HIGHLY EFFICIENT
FAMILY
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Summary:We describe the synthesis and optical properties of 1,2-dithienylethylene derivatives (DTE-8–15) consisting of ortho-fused heterocyclic systems such as benzodithiophene and naphthothiophene. The compounds 8–13 are highly fluorescent in toluene solution and their intensities are approximately two times as large as 4,4′-bis(2,2-diphenylethenyl)biphenyl (18). The fluorescence quantum yields of compounds 8–15, except for 14, are 2 times as high as that of 18. Although a maximum luminance of 9 in a multilayer device of structure ITO/CuPc/NPD/9/Alq3/LiF/Al is low (186 cd m-2), the brightness is significantly improved by doping the host emitters such as 18 and 9,10-bis(2-biphenylyl)-2-(t-butyl)anthracene (19) with 9. The electroluminescent (EL) device doped with 8 (5%) in the layer of 19 exhibits blue emission with a maximum luminance of 30000 cd m-2 at a driving voltage of 14 V and a luminous efficiency of 2.42 lm W-1 at 5V.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.75.551