【摘要】 通过对器件结构的优化设计,提高了白光电致发光器件中蓝光成分的发光效率,从而得到了一种较为理想的有机白光电致发光器件。驱动电压为5V时,电流密度J=0 5mA/cm2,器件的效率达到最大,流明效率为1 92lm/W,此时器件的发光亮度接近20cd/m2,色坐标为(x=0 317,y=0 328),非常接近白光等能点,是色度很好的白光。并且在很大范围内,色度随器件的驱动电压或电流变化不大,当驱动电压变化至15V时,J=232mA/cm2,色坐标变化至(x=0 338,y=0 353)。在电压为22V时,器件的亮度达到最大,为17000cd/m2。此外器件结构相对简单,器件制备的可重复性得到很大程度的改善。更多还原

【Abstract】 An organic whitelight electroluminescent device with high performances is designed and fabricated. In this work, the efficiency of bluelightemitting was improved only by designing the device structure, which increase the performances of the whitelightemitting device. Using a hole blocking material (BCP) to controlling the lightemitting zone based on NPB layer, we obtained bluelightemitting, which comes from excited NPB molecules. Similarly, we obtained yellowlightemitting by doping in NPB layer with rubrene. Base on the above, through partly doped NPB layer with rubrene, in which the doped part of NPB layer emits orangelight and the undoped part contributes to bluelight, we can obtain whitelightemitting. Because the undoped part of NPB is near the interface of NPB/BCP and this layer is very narrow, only about 3nm, the efficiency of bluelight emission is increased, which results the improvement of the performances of whitelight emitting device. The device has a maximum brightness of 17 000cd/m2 (at a driving voltage of 22V), and the maximum electroluminescent and power efficiency are 305cd/A and 192 lm/W (at a drive voltage of 5V, the current density of 05mA/cm2), respectively. At drive voltage of 5V, the CIE coordinate of the device is (x=0317, y=0328), which is very close to the equienergy point.更多还原