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硒化镉量子点具有随粒径尺寸改变,而产生发光波长调变的特性,目前已被广泛研究。本研究是由化学溶胶法合成不同粒径尺寸的核壳型CdSe/ZnS硒化镉量子点,其表面包覆十六烷基胺,避免分子团聚现象。在由硒化镉成核温度的控制,成功地制备一系列具有各种尺寸粒径的核壳型硒化镉量子点(2～6nm)。本研究也合成了含有纳米金粒子于核壳型硒化镉量子点,实验结果发现:硒化镉发光效率明显的提高。在有机发光器件的应用方面,将发光波长为505nm核壳型CdSe/ZnS量子点掺入溶有发光波长为570nm铱化合物的氯仿溶液时,其溶液的光致发光光谱表明,原量子点的发光特性消失,只有铱化合物的发光依然存在,且其发光强度呈现明显增强趋势,我们推测此现象源自于量子点到铱化合物能量转移的机制。我们也以含有核壳型硒化镉量子点的铱化合物与PVK混合材料为发光层,成功的制作发光二极管器件,器件的发光效率因核壳型硒化镉的掺杂,明显提高2倍多。
CdSe QDs have the characteristics of changing the emission wavelength with the size of the particles and have been widely studied. In this study, CdSe / ZnS CdSe quantum dots with different particle size and size were synthesized by chemical sol-gel method. The surface of the CdSe quantum dots was coated with hexadecylamine to avoid the phenomenon of molecular agglomeration. Controlled by the nucleation temperature of cadmium selenide, a series of quantum dots (2 ~ 6nm) of core-shell CdSe quantum dots with different sizes and sizes have been successfully prepared. In this study, we also synthesized quantum dots containing gold nanoparticles in core-shell CdSe-CdS. The experimental results show that the luminescent efficiency of cadmium selenide is obviously improved. In the application of organic light-emitting devices, the light-emitting wavelength of 505nm core-shell CdSe / ZnS quantum dots dissolved in a luminescent wavelength of 570nm iridium compound dissolved in chloroform solution, the solution of the photoluminescence spectra showed that the original quantum dots of light However, only the luminescence of iridium compounds still exists and the luminescence intensity of the iridium compounds shows a significant enhancement. We speculate that this phenomenon originates from the mechanism of the energy transfer from the quantum dots to the iridium compounds. We also successfully fabricated LED devices using iridium compounds and PVK mixed materials containing core-shell cadmium selenide QDs as the light-emitting layer. The light-emitting efficiency of the device is obviously more than doubled due to the doping of core-shell cadmium selenide .