2D–π–A type pyran-based dye derivatives: Photophysical properties related to intramolecular charge transfer and their electroluminescence application
作者： Giseop Kwak , Sheng Wang , Myung-Sik Choi , Hyeryun Kim , Kyu-Han Choi
DOI: 10.1016/J.DYEPIG.2007.10.003
关键词:
摘要: 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, electron did not impart red-emission saturation. A locked ring structure the group led narrowing full width at half maximum (fwhm) increased dipole moment ground state; addition, bulky resulted molecular stability restrained electronic perturbation on excited state. An EL device based dyes displayed bright saturated red light high luminance about 2000 cd/m 2 current density 160 mA/cm 16 V.
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