Impeding anion exchange to improve composition stability of CsPbX3 (X = Cl, Br) nanocrystals through facilely fabricated Cs4Pb X6 shell

Impeding anion exchange to improve composition stability of CsPbX₃ (X = Cl, Br) nanocrystals through facilely fabricated Cs₄Pb X₆ shell

Shen Zhaohui^{1, 2}, Song Pengjie^{1, 2}, Qiao Bo^{1, 2}, Cao Jingyue^{1, 2}, Bai Qiongyu^{1, 2}, Song Dandan^{1, 2}, Xu Zheng^{1, 2}, Zhao Suling^{1, 2, †}, Zhang Gaoqian^{1, 2}, Wu Yuanjun³

(a) UV-absorption spectra of CsPbX₃ and CsPbX₃@Cs₄PbX₆ NCs. (b) PL of CsPbX₃ NCs before and after anion exchange. (c) Peak positions of CsPbX₃ NCs before and after anion exchange. (d) PL of mixed CsPbX₃@Cs₄PbX₆ NCs. (e) Peak positions of CsPbX₃@Cs₄PbX₆ NCs before and after mixing coated NCs up.