有机量子阱电致发光器件

制备了普通的有机量子阱结构,并对结构进行了表征.在此基础上,制备了量子阱结构的白光电致发光器件.在分析了制作工艺对有机量子阱结构特性可能产生的影响之后,为了减少垒、阱界面互扩散效应的影响,提出了有机掺杂量子阱的概念,即垒与阱的母体是相同材料,只是在生长垒层的过程中同时掺入少量发光剂.由于掺杂剂的浓度梯度只有百分之零点几,因此,界面互扩散的影响很小,实际上我们用这种办法制备的有机量子阱器件的亮度、效率均有明显提高.在研究了阱数对器件特性的影响之后,我们发现一般情况下,两个阱是最好的.进一步研究了阱母体材料对有机量子阱器件特性的影响,结果发现,用NPB作母体比Alq作母体更好,这时器件的效率(cd/A)在45～13V工作电压范围内变化不大.

Organic Quantum-well Structure Light-emitting Devices

The development of the organic quantum-well structure devices was introduced systemically. The conventional organic quantum-well structures were fabricated. The optical and electrical properties of the device were measured and the structures were scaled by the small-angle X-ray diffraction pattern. Based on the techniques, the organic quantum-well structure white light-emitting device was first fabricated and the performances were reported on the article. With the analysis of the possible effects on the performances of the organic quantum-well structure which induced by the fabrication technology, in order to decrease the diffusion effect at the interface of the quantum-well layer and barrier potential layer, the organic doping quantum-well structure was bring forward for the first time in the world. The structure consists of the alternating doping and undoping structure, in which the doping layer acts as quantum-well and the undoping layer as barrier potential layer. The performances of the device with the doping quantum-well structure were significantly enhanced and the results were analyzed. The optimum of the number of the quantum-well was also studied, and the result is two. Through suitable selection of the matrix and the dopants, the efficiency of the device would decrease slowly with the increase of the driven voltage.