Confinement of all-inorganic perovskite quantum dots assembled in metal–organic frameworks for ultrafast scintillator application. Issue 11 (2nd March 2022)

• Record Type: Journal Article
• Authors: Ren, Cewei; Li, Zhanpeng; Huang, Lu; Xiong, Xinlin; Nie, Ziqi; Yang, Yunling; Zhu, Wenqing; Yang, Weiguang; Wang, Linjun
• Is Part Of: Nanoscale. Volume 14:Issue 11(2022)
• Page Start: 4216
• Page End: 4224
• Publication Date: 2022-03-02
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d1nr08120a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A metal–organic framework confines the size of perovskite quantum dots to achieve a unique process of an ultra-fast scintillator. Abstract : Nucleation and growth of quantum dots (QDs) are thermodynamic processes driven by the total Gibbs free energy change (Δ G ). We discuss the nucleation and growth theory of perovskite quantum dots (PeQDs) inside a metal–organic framework (MOF) as a strong constraint framework, which can effectively confine the size of QDs below 3 nm and achieve a scintillator with an ultra-fast transient lifetime of fluorescence. Therefore, based on the requirements for the optical properties of ultra-fast scintillation materials, two kinds of suitable MOFs (UiO-67-bpy and MIL-101(Cr)) were selected for synthesis. The method of 'ship-in-bottle' was adopted to embed perovskite quantum dots CsPbBrCl2 into MOF cages to form PeQDs@MOF composite materials, which is different from the one-pot method. In order to further improve the stability of PeQDs@MOF, polystyrene was used to cure the composite scintillator, which can resist exposure to UV light and withstand the ISO level 4 test, with the fastest transient lifetime of 2.13 ns and a fluorescence emission wavelength of 445 nm.