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2D-pi-A type pyran-based dye derivatives: Photophysical properties related to intramolecular charge transfer and their electrolurninescence application

Title
2D-pi-A type pyran-based dye derivatives: Photophysical properties related to intramolecular charge transfer and their electrolurninescence application
Authors
Kwak, G[Kwak, Giseop]Wang, S[Wang, Sheng]Choi, MS[Choi, Myung-Sik]Kim, H[Kim, Hyeryun]Choi, KH[Choi, Kyu-Han]Han, YS[Han, Yoon-Soo]Hur, Y[Hur, Youngjun]Kim, SH[Kim, Sung-Hoon]
DGIST Authors
Han, YS[Han, Yoon-Soo]
Issue Date
2008
Citation
Dyes and Pigments, 78(1), 25-33
Type
Article
Article Type
Article
Keywords
Carbazolyl GroupCharge TransferCurrent DensityDipole MomentDyeDyesElectroluminescenceElectron AcceptorElectron DonorExcited StatesFluorescenceGround-StateLuminescenceMolecular StabilityMolecular StructurePermittivityPyran-Based DyeStokes Shift
ISSN
0143-7208
Abstract
Five different types of 2D-π-A (vinylcyanoacetate)pyran derivatives, each having two donor (2D) and one acceptor (A) groups showed significantly large Stokes shifts. Their fluorescence bands shifted to longer wavelengths with an increase in solvent dielectric constant. The π-conjugated moiety, such as a carbazolyl group, as an electron donor did not impart red-emission saturation. A locked ring structure of the electron donor group led to narrowing of the full width at half maximum (fwhm) and to increased dipole moment in the ground state; in addition, bulky donor groups resulted in molecular stability and restrained electronic perturbation on the excited state. An EL device based on the dyes displayed bright and saturated red light with a high luminance of about 2000 cd/m2 at a current density of 160 mA/cm2 at 16 V. © 2007 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3580
DOI
10.1016/j.dyepig.2007.10.003
Publisher
ELSEVIER SCI LTD
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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