Lanthanide-doping enables kinetically controlled growth of deep-blue two-monolayer halide perovskite nanoplatelets. Issue 26 (29th June 2021)

• Record Type: Journal Article
• Authors: Cao, Qinxuan; Ilyas, Asif; Zhang, Shuai; Ju, Zhijie; Sun, Fangling; Liu, Tianyu; Yang, Yang(Michael); Lu, Yunhao; Liu, Xinfeng; Deng, Renren
• Is Part Of: Nanoscale. Volume 13:Issue 26(2021)
• Page Start: 11552
• Page End: 11560
• Publication Date: 2021-06-29
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d1nr02508b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The doping of lanthanides enables the preparation of high-quality deep-blue emitting 2-monolayer CsPbBr3 nanoplatelets by enhancing the energy barrier for intermediates in the transformation of 2-monolayer to 3-monolayer CsPbBr3 nanoplatelets. Abstract : Impurity doping has been widely applied in nanomaterial synthesis for modulating the crystallographic phase, morphology, and size of nanocrystalline materials, but mostly by altering thermodynamic equilibria of final products. Here, we report the use of lanthanide dopants to manipulate the growing kinetics of halide perovskite nanocrystals to enable the preparation of highly anisotropic two-dimensional (2D) CsPbBr3 -based nanoplatelets with precisely controlled thickness. We demonstrate that the incorporation of trivalent lanthanides increases the energy barrier in growing three-monolayer (3 ML) CsPbBr3 from a 2 ML intermediate. It enables the growth of thermodynamically unfavorable 2 ML CsPbBr3 products through kinetic control. This finding provides a novel approach for dimensional control of perovskite nanocrystals with strong quantum confinement. It offers opportunities to generate deep-blue emitting (at 430 nm) CsPbBr3 :Lu 3+ nanoplatelets with good structural- and photo-stabilities potentially useful for many applications including light-emitting, lasers, and photocatalysis.