超薄插入法实现的理想白色有机电致发光器件

摘要

以典型发光材料——联苯乙烯衍生物(4,4’-bis(2,21’-diphenylvinyl)-1,1’-biphenyl,DPVBi)和红荧烯(5,6,11,12-tetraphenylnaphthacene,Rubrene)分别为蓝色、橙色发射体,通过在DPVBi中插入一层超薄Ru-brene制备了结构简单的非掺杂型白色有机电致发光器件,得到了低压启动、效率和色度俱佳的白色发光器件.器件启亮电压为3.1V,最高电流效率为6.7 cd/A(流明效率5.5 lm/W或外量子效率2.8％),器件色坐标达到理想的白平衡点(0.33,0.33).理想白光的获得归因于通过调整NPB/DPVBi界面到Rubrene的距离,实现了从DPVBi到Rubrene能量传递的最佳比例.%By using typical luminescent materials,4,4'-bis (2,2'-diphenylvinyl)-1,1 '-biphenyl (DPVBi) and 5,6,11,12-tetraphenylnaphthacene (Rubrene) as a blue and orange emitter,respectively,a highly efficient bright nondoped white electroluminescent device with low driving voltage and ideal chromaticity is fabricated.The turn-on voltage,maximum current efficiency are 3.1 V,6.7 cd/A (luminous efficacy of 5.5 lm/W,external quantum efficiency of 2.8％),respectively.Commission Internationale de l'Eclairage (CIE) co-ordinates are at ideal equal-energy white point (0.33,0.33).The achievement of excellent white emission is attributed to realizing perfect ratio of energy transfer from DPVBi to Rubrene by tuning distance from NPB/DPVBi interface to Rubrene.