High Efficiency Deep-Blue Phosphorescent Organic Light-Emitting Diodes with CIE <i>x</i>
, <i>y</i>
(≤ 0.15) and Low Efficiency Roll-Off by Employing a High Triplet Energy Bipolar Host Material
作者:Athithan Maheshwaran、Vijaya Gopalan Sree、Ho-Yeol Park、Hyein Kim、Si Hyun Han、Jun Yeob Lee、Sung-Ho Jin
DOI:10.1002/adfm.201802945
日期:2018.9
type Ir(cb)3 material as a deep‐blue emitter. The optimized devices show an excellent external quantum efficiency (EQE) of 24.8% with a notable Commission internationale de l'éclairage (x, y) ≤ 0.15, (0.136, 0.138) and high electroluminescence performance with extremely low efficiency roll‐off. Overall, the above EQE is the highest reported for deep‐blue PHOLEDs with very low efficiency roll‐off and
最近,双极性主体材料是实现高性能磷光有机发光二极管(PHOLED)以便最大程度提高复合效率的最有希望的候选材料。然而,迄今为止,开发具有高三线态能量(E T)的主体材料仍然是克服与当前PHOLED相关联的局限性的巨大挑战。在此,一个高效的供体-π-受体(D-π-A)型双极宿主(4'-(9H-咔唑-9-基)-2,2'-二甲基-[1,1'-联苯]-开发了分别由咔唑,2,2'-二甲基联苯和二苯基磷酰基作为D-π-A单元的4-基)二苯基氧化膦(m- CBPPO)。有趣的是,m-的E T为3.02 eVCBPPO由于高度扭曲的构象。此外,新的主体材料以发光层的形式结合在PHOLED中,而新的卡宾型Ir(cb)3材料则作为深蓝色发射体。经过优化的器件具有出色的24.8%的外部量子效率(EQE)和显着的国际照明委员会(x,y)≤0.15(0.136,0.138 )和高电致发光性能,且效率极低。总体而言,