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以铱配合物红色磷光体为掺杂剂,制备了基于TPBi材料的红色电致磷光器件,其结构为ITO/CuPc/NPB/TPBi:Btp2Ir(acac)/TPBi/Alq/LiF/Al.取得了在x=0·62,y=0·35的色度下,效率最高达2·43cd/A;电流密度为20mA/cm2时,亮度431cd/m2;电流密度为400mA/cm2时,亮度4798cd/m2的结果.讨论了不同的发光层厚度影响器件色度和效率的主要因素:当发光层厚度小于15nm时,发光层中掺杂剂分子不能充分俘获从NPBHOMO能级上隧穿的空穴以及三线态激子之间相互作用导致的发光自猝灭是影响器件性能的主要原因;但当发光层厚度大于20nm时,无效的发光层以及发光层中的猝灭中心可能是造成器件效率下降的重要因素.
The red phosphorescent device based on TPBi was prepared by using iridium complex red phosphor as dopant and its structure was ITO / CuPc / NPB / TPBi: Btp2Ir (acac) / TPBi / Alq / LiF / Al. The efficiency is up to 2.43 cd / A at chromaticity of x = 0.62 and y = 0.35; the brightness is 431 cd / m 2 at the current density of 20 mA / cm 2; the brightness is 4798 cd / m 2 at the current density of 400 mA / m2 The main factors that affect the chromaticity and efficiency of the device are discussed: when the thickness of the light-emitting layer is less than 15 nm, dopant molecules in the light-emitting layer can not sufficiently trap holes that tunnel from the NPB HOMO level, and The self-quenching of the luminescence due to the interaction between triplet excitons is the main reason for the performance of the device. However, when the thickness of the luminescent layer is greater than 20 nm, the quenching centers of the ineffective luminescent layer and the luminescent layer may decrease the device efficiency Key factor.