OLED电极引线的腐蚀机理分析

Corrosion Mechanism of Leads of OLED

有机电致发光器件(OLED)电极引线发生腐蚀是OLED失效的重要原因.用XRD,XPS,SEM和EDX等方法对镀Cr的ITO电极引线样品的腐蚀产物成分、结构和形貌进行了分析,XRD和XPS结果表明镀层Cr反应生成Cr(OH)3和CrO3,SEM和EDX结果表明Cr先腐蚀,ITO随后发生腐蚀.然后通过对引线样品在不同溶液中的极化曲线分析,得知Cr腐蚀产物的价态与其所处的电位有关,且氯离子对ITO腐蚀具有促进作用.最后根据实验结果对电极引线腐蚀的全过程提出一简化模型进行解释.

Lead corrosion of organic light emitting diodes is an important cause of OLED device failure.The corrosion product of Cr-coated ITO leads was characterized by using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM) and energy dispersion X-ray(EDX) methods.The results of XRD and XPS showed that Cr coat was eroded first to form the products Cr(OH)3 and CrO3 while the results of SEM and EDX indicated that ITO was eroded subsequently.Analysis of the polarization curv...