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提高有机电致发光器件(OLED)的稳定性和寿命是其市场化应用中需要解决的关键问题.本文从提高发光材料自身的稳定性出发,以Mg(CF3COO)2–x(CH3COO)x溶胶为前驱体,将其与8-羟基喹啉铝(Alq3)混合浓缩成糊状后,300°C真空烧结,经过MgF2的生成和Alq3的相变后,形成了一系列Mg含量不同的具有超结构ε相的纳米复合材料Alq3-MgF2.研究结果表明,相比于纯Alq3,Alq3-MgF2纳米复合材料制备的OLED可以很好地保持Alq3的发光特性,同时,其抗老化性能得到显著提高.特别是,Mg(CH3COO)2投料量为Alq3的5%(摩尔分数)时,所得Alq3-MgF2纳米复合材料制备的器件抗老化性能最优,在空气中老化72 h,最大发光亮度仍保持在起始值的93.5%;而Alq3制备的OLED在空气中老化24 h后基本失活.
To improve the stability and lifetime of organic electroluminescent devices (OLEDs) is a key issue to be solved in market-oriented applications.In order to improve the stability of the luminescent materials, a novel sol-gel method based on Mg (CF3COO) 2-x As a precursor, which was mixed with 8-hydroxyquinoline aluminum (Alq3) concentrated into a paste, the vacuum sintering 300 ° C, after the formation of MgF2 and Alq3 phase transition, the formation of a series of different Mg content with super Structure of ε-phase nanocomposite Alq3-MgF2.The results show that compared with pure Alq3, Alq3-MgF2 nanocomposites prepared OLED can well maintain the light-emitting properties of Alq3, while its anti-aging properties have been significantly improved. In particular, when the dosage of Mg (CH3COO) 2 is 5% (mole fraction) of Alq3, the prepared Alq3-MgF2 nanocomposites have the best anti-aging performance. The aging time is 72 h in air and the maximum brightness remains at The initial value of 93.5%; and OLED prepared Alq3 substantially deactivated in the air 24 hours after aging.