title: Core-structure effects of novel indenopyrazine derivatives for blue emitter.
abstract: A novel core material, indenopyrazine, has been substituted with ethyl, phenyl, tolyl or fluorenyl groups on the locations 6 and 12, to newly synthesize four blue-emitting materials for OLED. Their electro-optical properties were compared through UV-Vis absorption, PL spectra and cyclic voltammetry, according to substituents of the core system of indenopyrazine. Non-doped OLED devices were fabricated by using the synthesized materials as emitting material layers, and among them, SF-EPY showed a highly-efficient luminescence with EL spectrum of 458 nm, luminous efficiency of 2.62 cd/A and CIE coordinates of (0.152, 0.142) at a current density of 10 mA/cm2.
authors.affiliation: Department of Chemistry, The Catholic University of Korea, Bucheon 420-743, Republic of Korea.
authors.forename: Young-Il
authors.initials: YI
authors.lastname: Park
authors.forename: Ji-Soung
authors.initials: JS
authors.lastname: Kang
authors.forename: Soo-Kang
authors.initials: SK
authors.lastname: Kim
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Jae-Yun
authors.initials: JY
authors.lastname: Jaung
authors.forename: Jong-Wook
authors.initials: JW
authors.lastname: Park