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研究了碳酸铯(Cs2CO3)作为电子注入层对蓝光有机电致发光器件性能的影响。结果表明,与常用的LiF/Al结构相比,Cs2CO3/Al结构的电子注入能力更强。对Cs2CO3电子注入层的厚度进行了优化,表明Cs2CO3厚度为1.5nm时,器件的发光效率和功率效率有很大提高,在较低电流密度(13.2mA/cm2)下即达到其最大发光效率(3.04cd/A),分析得到真空蒸镀Cs2CO3能够有效提高电子注入的机理:低功函的金属Cs起到了克服肖特基势垒、增强电子注入的作用。
The effect of cesium carbonate (Cs2CO3) as an electron injection layer on the performance of a blue-light organic electroluminescent device was investigated. The results show that compared with the common LiF / Al structure, Cs2CO3 / Al structure has stronger electron injection ability. The thickness of Cs2CO3 electron injection layer is optimized, which shows that the luminescent efficiency and power efficiency of Cs2CO3 have been greatly improved when the thickness of Cs2CO3 is 1.5nm, which reaches its maximum luminous efficiency (13.2mA / cm2) at low current density 3.04cd / A). The vacuum deposition of Cs2CO3 can effectively improve the mechanism of electron injection. The low work function metal Cs plays a role of overcoming Schottky barrier and enhancing electron injection.