title: Thermal degradation of luminescence in inorganic perovskite CsPbBr3nanocrystals.
abstract: The luminescence properties of inorganic perovskite CsPbBr3nanocrystals (NCs) with emissions of 492 and 517 nm under thermal annealing treatment were studied by temperature-dependent photoluminescence (PL) spectroscopy. The CsPbBr3NCs were annealed in vacuum at various temperatures. It was found that the NCs exhibited significant thermal degradation of PL at thermal annealing temperatures above 320 K. The transmission electron microscopy, X-ray diffraction and PL spectroscopy demonstrated that the size of NCs almost kept constant at thermal annealing temperatures below 360 K while it significantly enlarged at higher thermal temperatures above 380 K. The PL intensities, peak energies and linewidths of the annealed NCs, as a function of temperature, are discussed in detail. The PL degradation of the NCs was related to the formation of nonradiative recombination centers due to the loss of ligands and growth of NCs under thermal annealing.
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn.
authors.forename: Xi
authors.initials: X
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn.
authors.forename: Xuemin
authors.initials: X
authors.lastname: Hou
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn.
authors.forename: Ji
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn.
authors.forename: Chaoqun
authors.initials: C
authors.lastname: Qu
authors.affiliation: Xingzi New Material Technology Development Co., Ltd., Shanghai 200333, China.
authors.forename: Wenjin
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn and College of Physics, Jilin Normal University, Siping 136000, China.
authors.forename: Jialong
authors.identifier: http://orcid.org/0000-0001-9020-1436
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China. zhaojl@ciomp.ac.cn lihaibo@jlnu.edu.cn.
authors.forename: Haibo
authors.initials: H
authors.lastname: Li