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在量子点的研究中,对于量子点光致发光研究报道较多,而量子点电致发光研究报道较少,特别是对于混合量子点电致发光器件中能量转移机理的研究未见报道,由于不同量子点之间的能量转移机理决定着器件的性能,为此本论文对该方面进行了研究.分别制备了单种量子点器件和混合器件,混合器件是利用红、绿、蓝三种量子点按照1:1的比例两两混合,做成结构为ITO/PEDOT:PSS/QDs/Al的器件.研究发现在一定电压范围内,单种量子点器件的发光强度随着电压增加持续上升,而混合量子点器件的发光出现了短波长下降,长波长上升的现象,表明当有外加电场时不同尺寸的量子点间产生了较高效率的能量转移.同时首次对混合量子点电致发光器件能量转移的各项参数进行了计算,得到了能量转移效率E、临界能量转移距离R0与外加电场的关系,对制备混合量子点电致发光器件具有指导意义.
In the research of quantum dots, there are many reports on quantum dots photoluminescence and few reports on quantum dot electroluminescence, especially the research on the mechanism of energy transfer in the hybrid quantum dot electroluminescent devices has not been reported. The mechanism of energy transfer between different quantum dots determines the performance of the device, and for this reason, this dissertation has studied the single quantum dot device and the hybrid device respectively, and the hybrid device utilizes three kinds of quantum dots of red, green and blue The devices were fabricated by ITO / PEDOT: PSS / QDs / Al in a 1: 1 ratio.The results showed that the emission intensity of a single kind of QDs increased with the increase of voltage within a certain voltage range, The phenomenon of short wavelength and long wavelength rising appeared in the mixed quantum dot device shows that higher efficiency energy transfer occurs between quantum dots with different sizes when an external electric field is applied.At the same time, the hybrid quantum dot electroluminescent device Energy transfer parameters were calculated, the energy transfer efficiency E, the critical energy transfer distance R0 and applied electric field, the preparation of hybrid quantum dot electroluminescent device has Guiding significance.