用硫酸处理ITO表面改善有机发光二极管的发光效率

Improving the Efficiency of Organic Light-emitting Diodes Using Indium Tin Oxide Treated by H_2SO_4

用硫酸溶液处理ITO表面制备了有机电致发光器件,发现随着溶液浓度和超声时间的不同,器件的效率也发生变化.当硫酸的浓度是98%且超声时间为10 min时,OLED具有最高的效率及较大的亮度,器件的效率提高了近4倍.通过扫描电镜对ITO表面形貌进行了对比分析,可以看到,经过处理的ITO玻璃表面的粗糙度明显降低,提高了有机膜的附着力,从而改善了器件的效率.

We fabricated organic light-emitting diodes （OLEDs） with indium tin oxide anode treated by the H2SO4 solution. The efficiency of the OLEDs depended on the different concentration and ultrasonic time by the H2SO4 solution. When the concentration was 98% and the ultrasonic time was 10 min,the OLED exhibited the best efficiency and higher luminance than those of traditional devices. In particular, its efficiency can be increased by four times. Scanning electron microscopy measurements showed that those treated ITO anodes were much smoother which indicated that the adhesion between ITO and hole-transport layer was increased.Therefore, the efficiency of OLEDs was improved by the treatment of ITO anodes.