热处理对MEH—PPV有机电致发光性能的影响

以MEH-PPV为发光层的单层聚合物有机发光二极管（OLED）器件在不同条件下进行真空热处理，并用金相显微镜观察器件在12V电压下工作的阴极表面形貌。与未经处理的器件相比，处理后的器件阴极表面的气泡及黑斑明显减少；器件的最大相对发光强度提高了一个数量级；启亮电压降低了2.0V；半寿命提高了12．7倍。初步分析表明，其主要原因在于，一方面有效地减少了器件在工作过程中由于焦耳热产生的有害气体，从而减少了阴极表面气泡及黑斑的出现；另一方面，热处理方法也增强了有机发光层与阴极接触界面的结合力，提高电子的注入能力。

The Effects of Heat Treatment on Luminescence Performance of Polymer Light-emitting Diodes with MEH-PPV Single Layer Structure

Heat treatment under different condition on MEH PPV OLED device with single layer structure was performed in this paper.The surface morphology of Al electrode of the device,which is operated at 12 V,is observed by Metallovert.It is found that the bubbles and black spots on the Al electrode surface was reduced,and compared with the unannealed device,the turn on voltage of the device is reduced by 2 V,the maximum EL intensity is increased by ten times,the relative energy efficiency is improved by ten times at the same voltage,the half decay time is increased by 12.7 times.