纳米结构氧化镍缓冲层对蓝色有机发光二极管性能的影响

摘要

在阳极和空穴传输层分别引入氧化镍纳米结构缓冲层,制备了蓝色有机发光二极管,对二极管的电学和光学特性进行了测试分析,研究了采用电化学方法制备的氧化镍纳米结构对器件的影响.结果表明,纳米结构氧化镍缓冲层能够有效地提高空穴-电子对的产生和复合效率,它的引入带来了高效的空穴注入及发光层中的载流子平衡,能有效提高有机发光二极管的电致发光特性.氧化镍缓冲层沉积时间为30 s的器件具有最高的亮度和电流效率,分别为42 460 cd/m2和24 cd/A,该器件的CIEx,y 色坐标为(0.212 9,0.325 2).%The electrical and optical properties of blue organic light-emitting diodes fabricated by utilizing nickel-oxide nano buffer layers between the anodes and hole transport layers were investigated.NiO nanolayer on ITO was prepared by the electrochemical methods.The effects of NiO nanolayer on the device performances were studied.The experimental results show that NiO buffer layer can effectively enhance the probability of hole-electron recombination due to an efficient holes injection into and charge balance in an emitting layer.The sample with Ni deposition time of 30 s has the highest luminance of 42 460 cd/m2, maximum current efficiency of 24 cd/A, and CIEx,y coordinates of (0.212 9, 0.325 2), respectively.