摘要
氧化铟锡(Indium Tin Oxide,ITO)具有高透光率、导电性能好等特点,作为阳极材料广泛应用于有机电致发光器件(Organic Electro-luminescent Device,OLED).但是,ITO的表面功函数与器件内的空穴传输层NPB的最高电子占有轨道(highest occupied molecular orbital,HOMO)之间存在较高的势垒,导致器件的驱动电压高、工作效率低、寿命短等问题.科学家经研究后发现ITO经氧等离子体的处理可大大提高空穴的注入和器件的稳定性.实验利用不同功率的混合等离子体对ITO进行不同时间的处理,使得ITO功函数大幅提升,优化了器件的性能.实验发现当使用功率为70 W的混合等离子体处理ITO时间长达15 min时,器件性能最优.相比未用等离子体处理的器件,启动电压低至3 V,最大亮度达到8 676 cd/m2,亮度提高了约1.4倍.
The indium tin oxide （ITO） has many advantages, such as transparent-lighting, good conductivity and so on, which is widely used as an kind of anode material in organic elec- tro-luminescent device （OLED）. However, the high barrier between ITO surface work function and the highest occupied molecular orbital （HOMO） of NPB, which is the hole transport layer of devices, causes high driving voltage, low efficiency, short life and other problems. The sci- entists have found that the treating of ITO by oxygen plasma can greatly improve the injection of holes and the stability of the device. In this experiment, treating ITO by using hybrid plasma with different processing power of 40 W, 50 W, 60 W and 70 W in different time periods, re- sults in the great improvement of ITO surf＇ace work function and optimizing the performance of the device. It has been found in the experiment that when the plasma treatment on ITO last 15 minutes with the power of 70 W, the performance of the device is optimal. Meanwhile, com- pared to the device without treatment of hybrid plasma, the driving voltage of the device treated by hybrid plasma is reduced to 3V, and the maximum luminance achieves 8 676 cd/m2. The luminance improves about 1.4 times.
出处
《西安文理学院学报（自然科学版）》
2016年第2期55-60,共6页
Journal of Xi’an University(Natural Science Edition)
基金
国家自然科学基金资助项目(60806047)
国家自然科学基金青年科学基金项目(11504036)
重庆市自然科学基金资助项目(CSTC2015jcyj A70001
CSTC2015jcyj B0430)
重庆市科技人才培养计划项目(cstc2013kjrc-qnrc90003)
重庆市教委科学技术研究项目(KJ1400509)
重庆市教委教改项目(yigl23100)
重庆市教委科学技术研究项目(KJ1500318)
首批重庆市高等学校青年骨干教师资助计划项目(53)
重庆师范大学教改项目(cyjg1219)
重庆师范大学博士启动资金项目(14XLB017)
重庆高校创新团队建设计划项目(201013)
关键词
等离子体
氧化铟锡
表面功函数
紫外吸收率
plasma
indium tin oxide
surface work function
ultraviolet absorption rate
