Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes
作者:Jae-Wook Kang、Deug-Sang Lee、Hyung-Dol Park、Young-Seo Park、Ji Whan Kim、Won-Ik Jeong、Kyung-Mo Yoo、Kyoungmoon Go、Se-Hoon Kim、Jang-Joo Kim
DOI:10.1039/b705741e
日期:——
One of the important factors for high efficiency phosphorescent organic light-emitting devices is to confine triplet excitons within the emitting layer. We synthesized and characterized a new hole blocking material containing silane and triazine moieties, 2,4-diphenyl-6-(4′-triphenylsilanyl-biphenyl-4-yl)-1,3,5-triazine (DTBT). Electrophosphorescent devices fabricated using the material as the hole-blocking layer and N,N′-dicarbazolyl-4,4′-biphenyl (CBP) doped with fac-tris(2-phenylpyridine)iridium [Ir(ppy)3] as the emitting layer showed a maximum external quantum efficiency (ηext) of 17.5% with a maximum power efficiency (ηp) of 47.8 lm W−1, which are much higher than those of devices using bathcuproine (BCP) (ηext = 14.5%, ηp = 40.0 lm W−1) and 4-biphenyloxolate aluminium(III) bis(2-methyl-8-quinolinato)-4-phenylphenolate (BAlq) (ηext = 8.1%, ηp = 14.2 lm W−1) as hole-blocking layers.
高效率磷光有机发光器件的重要因素之一是将三线态激子限制在发光层内。我们合成并表征了一种含有硅烷和三嗪部分的新型空穴阻挡材料,2,4-二苯基-6-(4'-三苯基硅烷基-联苯-4-基)-1,3,5-三嗪(DTBT)。使用该材料作为空穴阻挡层,掺杂Fac-三(2-苯基吡啶)铱[Ir(ppy)3]的N,N'-二咔唑基-4,4'-联苯(CBP)作为发光材料制备电致磷光器件层的最大外量子效率(ηext)为17.5%,最大功率效率(ηp)为47.8 lm W−1,远高于器件的效率使用浴铜灵 (BCP) (ηext = 14.5%, ηp = 40.0 lm W−1) 和 4-联苯氧醇铝 (III) 双(2-甲基-8-喹啉基)-4-苯基苯酚盐 (BAlq) (ηext = 8.1%, ηp = 14.2 lm W−1) 作为空穴阻挡层。