The maximum emission intensityof 342 cd m-2and 267 cd m-2are observed at18Vand 55 mAcm-2in the device of C1.The lumines-cence intensity of the LED with C1as EML is brighter than that of the LED with C2as EML.

• 在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是342 cd m-2; 在18V电压和57mAcm-2电流下,器件C2的最大发光亮度是267 cd。