材料科学
纳米棒
光致发光
光电子学
半最大全宽
量子产额
纳米晶
成核
量子效率
发光二极管
电致发光
发光
二极管
量子点
紫外线
纳米技术
光学
图层(电子)
荧光
化学
物理
有机化学
作者
Wenbin Shi,Xiao Zhang,Cong Xie,Hsueh‐Shih Chen,Ping Yang
标识
DOI:10.1002/adom.202302129
摘要
Abstract Controlled nucleation and slow growth endow blue emitting CsPbX 3 nanocrystals (NCs) with bright photoluminescence (PL), which is crucial needed in luminescent devices. In this paper, a low‐temperature injection synthesis method is developed to control nucleation and the growth process by decreasing the reaction rate of ions, thereby controlling the morphologies of CsPbX 3 NCs in clusters, nanorods (NRs), nanoplates (NPLs), and nanocubes by adjusting precursors, ligands, and injection parameters. CsPbX 3 NCs exhibit excellent PL properties such as high quantum confinement effect. The PL peak wavelengths of CsPbBr 3 NPLs and NRs are at 451 and 467 nm, respectively, in which their full width at half maximum (FWHM) of PL spectra is 22 and 12 nm, while their PL efficiencies are 65 and 74%, respectively. The method is further used to create CsPbI 3 and CsPbCl 3 . CsPbI 3 NPLs and NRs reveal PL peaks at 590 and 600 nm and PL efficiencies of 56% and 60%, respectively. These NCs exhibit excellent stability against ultraviolet light irradiation. A color conversion layer for white light‐emitting diodes is fabricated using these highly bright NCs. A Commission Internationale d'Eclairage color coordinate of (0.31,0.33) is located at the white light region specified by Rec.2020 standard, and the color temperature reaches 6189 K.
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