不同摩尔比的CsPbBr3钙钛矿量子点微晶发光性能

Luminescent Properties of CsPbBr3 Perovskite Quantum-dot Microcrystals with Different Molar Ratios

采用一种新颖的高温熔融淬火的方法,成功地在硼硅酸盐微晶内部制备了CsPbBr3量子点。为了探究钙钛矿量子点形成的最佳条件,对钙钛矿原料分别以Cs∶Pb∶Br=1∶1∶3的摩尔比和Cs∶Pb∶Br=6∶1∶4的摩尔配比进行了对比研究。通过扫描电子显微镜(SEM)对钙钛矿量子点微晶进行了形貌上的表征分析;通过荧光光谱、CIE色度坐标分析其荧光特性。SEM研究结果表明,微晶表面均匀分布着CsPbBr3量子点。在荧光光谱检测下,实现了在360 nm的紫外光激发下,量子点呈现出较强的绿光发射。CIE色度坐标图上显示,钙钛矿原料在Cs∶Pb∶Br=6∶1∶4的摩尔配比下处于较高纯度的绿光区域。因此,量子点可应用于高光效的新型固体发光器件的中。

A novel high-temperature melt quenching method was used to successfully prepare CsPbBr3 quantum dots inside borosilicate microcrystals.In order to explore the optimal conditions for the formation of perovskite quantum dots,the molar ratio of Cs∶Pb∶Br=1∶1∶3 and 6∶1∶4 were used for the perovskite raw materials,respectively.The scanning electron microscope(SEM)was used to characterize the morphology of the perovskite quantum dot.The fluorescence characteristics were analyzed by fluorescence spectrum and CIE chromaticity coordinates.The results of SEM show that CsPbBr3 quantum dots are evenly distributed on the surface of the crystallites.Fluorescence spectroscopy tests show that CsPbBr3 quantum dot microcrystals exhibit strong green emission at 360 nm wavelength excitation.The CIE chromaticity coordinate chart shows that the perovskite raw material is in a higher purity green light region under the molar ratio of Cs∶Pb∶Br=6∶1∶4.Therefore,it is possible to explore the development of new solid-state light-emitting devices with long life and high light efficiency for perovskite materials.