期刊
ORGANIC ELECTRONICS
卷 11, 期 5, 页码 864-871出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2010.01.030
关键词
OLED; Luminescence; Indenopyrazine; Density functional calculations; Blue-violet emitter; m-Terphenyl
资金
- Ministry of Knowledge Economy (MKE), Republic of Korea
- Korea government [20090080199]
- Catholic University of Korea [M2009B000200181]
A promising class of blue-violet emitters based on a new functional core, the indenopyrazine group, has successfully been synthesized for the first time by substitution with bulky m-terphenyl side groups in the ortho, meta, or para positions. There are larger blue shifts in the UV-visible absorption and PL spectra of the synthesized ortho-and para-substituted derivatives than in those of the meta-substituted derivative. Molecular calculations verified that these differences are due to the variation in the p-conjugation length of the derivatives with the position at which the side group is attached to the indenopyrazine core. When the synthesized compounds were used as emitting layers in non-doped OLED devices, a related trend was observed in their optical properties. In particular, the OLED containing the para-substituted derivative was found to exhibit excellent characteristics, with maximum EL emission at 423 nm, a full width at half maximum of 42 nm, pure violet emission with CIE coordinates (0.173, 0.063), and an external quantum efficiency of 1.88%. (C) 2010 Elsevier B. V. All rights reserved.
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