摘要
采用不同的真空热梯度升华条件,获得了不同纯度的乙酰丙酮酸二(2-苯基吡啶)铱Ir(ppy)2(acac)。以不同纯度Ir(ppy)2(acac)为客体材料,制备了结构为ITO∶Mo O3/CBP/CBP∶Ir(ppy)2(acac)/TPBi/Li F∶Al的有机发光二极管(OLEDs),其中CBP和TPBi分别是4,4'-二(9-咔唑)联苯和1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯。评价了不同纯度磷光铱配合物制备的器件的电致发光性能,探索了磷光铱配合物纯度对器件性能的影响。结果表明:Ir(ppy)2(acac)升华后可以提高器件的稳定性,纯度高的材料可以在较低的掺杂浓度下获得较高的发光效率。
Ir(ppy)2(acac) with different purity levels were obtained by adopting various thermal gradient vacuum sublimation conditions, and were used as phosphorescence dopants in OLEDs with a structure of ITO∶MoO3/CBP/CBP∶Ir( ppy) 2 ( acac)/TPBi/LiF/Al, where CBP and TPBi were the abbreviations of 4,4'-N,N'-dicarbazole-biphenyl and 1,3,5-tris( N-phenylbenzimidazole-2-yl) ben-zene, respectively. The electroluminescent performances of Ir( ppy) 2 ( acac) were evaluated and the effect of purity levels was explored. The results indicate that sublimation improves electroluminescent stability of the device, and a higher purity level endows the device with greater electroluminescent efficiency even at a low doping concentration.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2015年第12期1396-1401,共6页
Chinese Journal of Luminescence
基金
国家科研院所技术开发专项(2013EG115008)
云南省科研院所技术开发专项(2012CF003)资助项目
关键词
磷光铱配合物
纯度
电致发光性能
OLED
影响
phosphorescent iridium complex
purity
electroluminescent performance
OLED
effect
