硫系玻璃薄膜封装层对OLED寿命的影响

在高真空条件下(3×10-4Pa),利用硫系玻璃(Se,Te,Sb)薄膜封装材料对有机电致发光器件(OLED)进行原位封装,有效避免了传统封装方法难以避免的水、氧危害,以达到延长器件寿命的目的。实验对比了正常封装与增加Se、Te、Sb薄膜封装层后器件的性能,对比实验中封装过程都未加干燥剂。研究发现Se、Te、Sb薄膜封装层分别可以使器件的寿命延长1.4倍,2倍,1.3倍以上;采用封装层对器件的电流-电压特性、色坐标等光电性能几乎不产生影响,但影响了器件散热,薄膜封装层使器件的击穿电压、最高亮度等参数稍有下降。

Influence of Sulfide Glass Thin Film Encapsulation Layer on Lifetime of OLEDs

On the condition of high vacuum(3×10~(-4) Pa), sulfide glass(Se,Te,Sb)thin film encapsulation layer was used as the protecting layer to OLEDs(organic light emitting diode), succeeding in prolonging the lifetime of the devices as well as avoiding the influence of H_2O and oxygen of traditional encapsulation method. Contrast test without desiccant was adopted,and it is found that the lifetime of the devices with Se, Te, Sb thin film encapsulate layer can be enhanced by 1.4, 2.0, 1.3 times, respectively. And sulfide glass thin film encapsulated layer has little influence on the performance of the devices, but it is harmful to the radiation of OLEDs, making the parameters of the breakdown voltage and the highest luminance decrease. So it is suggested that sulfide glass can be used as the encapsulation layer to improve the stability of the device effectively and prolong the lifetime obviously.