为优化反应过程对合成钙钛矿量子点及其薄膜质量的影响,本文采用相较于碳酸铯溶解性更好的醋酸铯为原料合成前驱体,并对不同条件下合成的量子点及制备的薄膜进行一系列特性表征。在不同反应温度及反应时间条件下采用热注入法合成CsPbBr3全无机钙钛矿量子点,在不同旋涂速度及退火时间条件下制备量子点薄膜。对制得的量子点进行X射线衍射、吸收光谱、荧光寿命、透射电子显微镜测试,对量子点薄膜进行光致发光特性表征。发现采用溶解性更好的醋酸铯为原料合成前驱体制备CsPbBr3全无机钙钛矿量子点,在反应温度为180 ℃、反应时间为5 s时,量子点尺寸最小,为8 nm,荧光寿命最长,为8 ns,晶体质量和吸收特性更好; 旋涂速度为3 000 r/min、退火时间为10 min条件下制得的CsPbBr3量子点薄膜光致发光强度最强、半峰宽最小。相较于相同条件下以碳酸铯为原料合成的量子点材料,以醋酸铯为原料合成的量子点溶液及薄膜各项性能均有提升。

In order to optimize the influence of reaction process on the quality of synthesized perovskite quantum dots(QDs) and the QDs thin films, cesium acetate is used as the raw material for the synthesis of precursors because of its better solubility than cesium carbonate. A series of properties of quantum dots and films prepared under different conditions were characterized. CsPbBr3 all-inorganic perovskite quantum dots were synthesized by heat-injection with different reaction temperatures and reaction times. The CsPbBr3 quantum dot films were prepared via different spin coating rates and annealing times. X-ray diffraction, absorption spectrum, fluorescence lifetime and TEM tests were carried out on the prepared QDs and the photoluminescence properties of the QD films were characterized. CsPbBr3 all-inorganic perovskite quantum dots were prepared by using cesium acetate with better solubility as the raw material for synthesis. It is found for the reaction temperature of 180 ℃ and the reaction time of 5 s, the quantum dots have smaller size of 8 nm and longer fluorescence life of 8 ns with high crystal quality and absorption characteristics. CsPbBr3 QD films prepared with rotation coating speed of 3 000 r/min and annealing time of 10 min have higher photoluminescence intensity and smaller full width at half maxima. Compared with quantum dot materials synthesized from cesium carbonate at the same conditions, quantum dots synthesized from cesium acetate as raw materials and the QD films have better optical properties.