New Deep Blue Emitting Materials Based on Indenopyrazine Core with High Thermal Stability
作者:Chang-Hun Seok、Young-Il Park、Soo-Kang Kim、Ji-Hoon Lee、Jongwook Park
DOI:10.1166/jnn.2011.3693
日期:2011.5.1
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.
新的深蓝色发光材料2,8-双(3,5-二苯基苯基)-6,6,12,12-四乙基-6,12-二氢二茚并[1,2-b:1′,2′-e]吡嗪(DPP-EPY)和2,8-双(3′,5′-二苯基联苯-4-基)-6,6,12,12-四乙基-6,12-二氢二茚并[1,2-b:1′,2′-e]吡嗪(DPBP-EPY)是通过在茚并吡嗪新核心中引入间三联苯或三苯基苯大侧基合成的。这些材料均表现出高热稳定性和高度降低的分子间相互作用。DPP-EPY和DPBP-EPY在深蓝色区域显示出最大PL为456 nm和460 nm,且具有半高全宽(FWHM)分别为46 nm和52 nm的窄PL光谱。由于使用这些合成的材料作为发光层制造非掺杂OLED器件,DPP-EPY显示出452 nm的EL光谱,非常窄的FWHM为46 nm,在电流密度为10 mA/cm