ITO再生处理对有机电致发光器件特性的影响

摘要

NaOH solution and HCl solution were used to recycle the used indium-tin oxide ( ITO) substrate. The treated surface was then observed by using atomic force microscopy ( AFM) , while organic light-emitting devices ( OLEDs) were fabricated with the recycled ITO to study the influence of reutilization on the performance of OLED. The results show that such treatments can efficiently re-move the residual aluminum electrodes on the used ITO and change the chemical composition of the surface, especially by the NaOH treatment. OLED based on such recycled ITO can achieve a cur-rent efficiency of 12. 08% with an increase of 14. 7% compared with that based on new ITO, while the external quantum efficiency reached 5. 23% with an increase of 11. 7%. In addition, the steri-cally hindered between the chromophores and between chromophore and auxochrome increased, re-sulting in the enhanced side-band effect in the electroluminescence spectrum of the device when ITO was processed by different methods.%分别采用NaOH和HCl溶液对废旧氧化铟锡( ITO)基板进行再生处理,用原子力显微镜( AFM)观测了处理后的ITO表面形貌,并基于再生处理过的ITO制备了有机电致发光器件( OLED),系统研究了器件的性能。结果表明,上述方法可以有效去除废旧ITO残留的铝电极并改变其表面的化学结构,提高了器件的特性,尤其以NaOH单次处理最为有效。以此制备的OLED器件电流效率达到12.08 cd/A,较之未回收利用的新ITO所制备的器件提高了14.7%；外量子效率达到5.23%,提高了11.7%。另外,经不同方法处理后,器件中生色团与生色团之间、生色团与助色团之间的空间位阻增大,器件发光光谱肩峰效应增强。