title: New deep blue emitting materials based on indenopyrazine core with high thermal stability.
abstract: New deep blue emitting materials 2,8-bis(3,5-diphenylphenyl)-6,6,12,12-tetraethyl-6,12-dihydrodiindeno[1,2-b:1',2'-e]pyrazine (DPP-EPY) and 2,8-bis(3',5'-diphenylbiphenyl-4-yl)-6,6,12,12-tetraethyl-6,12-dihydrodiindeno[1,2-b:1',2'-e]pyrazine (DPBP-EPY) were synthesized through introduction of m-terphenyl or triphenylbenzene bulky side groups in a new indenopyrazine core. These materials all showed high thermal stability and highly reduced intermolecular interaction. DPP-EPY and DPBP-EPY showed PL maxima of 456 nm and 460 nm in deep blue region and narrow PL spectra with full-width at half-maximum (FWHM) of 46 nm and 52 nm, respectively. As a result of making non-doped OLED devices using these synthesized materials as emitting layers, DPP-EPY showed EL spectrum of 452 nm, very narrow FWHM of 46 nm, luminance efficiency of 1.04 cd/A with current density of 10 mA/cm2 and CIE coordinate of (0.161, 0.104), creating a deep blue OLED close to the National Television System Committee (NTSC) blue standard.
authors.affiliation: Department of Chemistry, The Catholic University of Korea, Bucheon 420-743, Republic of Korea.
authors.forename: Chang-Hun
authors.initials: CH
authors.lastname: Seok
authors.forename: Young-Il
authors.initials: YI
authors.lastname: Park
authors.forename: Soo-Kang
authors.initials: SK
authors.lastname: Kim
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Jongwook
authors.initials: J
authors.lastname: Park