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一种含叔丁基的螺二芴类空穴传输材料的制备及性能表征
丁宁, 李乐, 张沈尧, 杜璟妍, 肖海波
上海师范大学
摘要:
以一端含有叔丁基的二氨基螺二芴化合物为起始原料,经过桑德迈尔反应与Ullman反应,制备出一种螺二芴类空穴传输材料,玻璃化温度高于320 ℃,远高于目前广泛使用的空穴传输材料(NPB).目标分子用作电致磷光器件中的空穴传输层,所得到的器件与传统的器件(以NPB为空穴传输层)相比,其能量效率、电流效率和外量子效率等性能更为优越.且由于具有高的三线态能级,器件中不需要插入第二空穴传输层4,4 ′,4″-三-(N-咔唑基)-三苯基胺(TCTA),提高了器件的效率,降低了器件的制作成本.作为有机电致发光(OLED)器件的空穴传输材料,其有望取代目前广泛使用的NPB,特别在有机电致磷光领域具有良好的实用前景.
关键词:  螺二芴  电致发光二极管  空穴传输  热稳定性  三线态能级
DOI:
分类号:
基金项目:上海市自然科学基金(15ZR1431400);上海市及上海师范大学大学生创新创业活动计划
Synthesis and properties of a spirobifluorene-based hole-transporting material containingtert-butyl group
DING Ning, LI Le, ZHANG Shenyao, DU Jingyan, XIAO Haibo
College of Life and Environmental Sciences,Shanghai Normal University
Abstract:
A spirobifluorene-based compound SPF-BMO was developed as hole transporters for green phosphorescent organic light-emitting diodes(PhOLEDs).The synthesized material showed sufficient HOMO/LUMO bandgap and triplet energy for green emitting bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato) iridium(III) [Ir (ppy)2(acac)].The addition of a thin layer of 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA)with a high triplet energy as an exciton-blockinglayer at hole transporter/emitter interface seems to be unnecessary.SPF-BMO showed high thermal stability due to its spiro-annulated structure.Compared with the standard green PhOLEDs,organic light-emitting diodes with SPF-BMO as the hole-transport material have improved performances such as enhanced device power efficiency andlonger stability.These results clearly demonstrate that SPF-BMO is among the best hole-transporting materials reported for green PhOLEDs and utilizing anappropriate hole transporter to construct a simplified device is a promising method to enhance the power efficiency of PhOLEDs.
Key words:  spirobifluorene  organic light-emitting diode  hole-transporting  thermal stability  triplet energy