Miao Zhang , Lei Gu , Jingyun Zhang , Qingmei Su , Jiaheng Yang , Gaowei Chen , Chunyang Liu , Yingjun Yang , Gaohui Du , Bingshe Xu , Hongyue Wang
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引用次数: 0
Abstract
The electronic structure of lead-halide perovskite nanocrystals (NCs) could be tailored to enable the tunable photoluminescence (PL) in the window from ultraviolet–visible–near infrared by halogen ion exchange reaction, which has been considered as the most effective and convenient post-treatment method for manipulating the chemical composition of the perovskite. However, the perovskite NCs with such post-treatment of ion exchange are generally not stable, and the mechanism of how the exchange reaction kinetic influences the stability of perovskite NCs has not been well demonstrated. In this work, we show that the Cl diffusion limited process in CsPbBr3 NCs is dependent on the Cl concentration in the solution, the Br/Cl ion exchange reaction is relatively gentle and ordered, which give rises a stable blue CsPbBrxCl3-x NCs. The competition between rapid alloy process and halogen segregation occurs in the CsPbBrxI3-x red NCs, the halogen segregation is responsible of the NCs degradation showing quenched PL emission after reaction. This work presents a view of interrelationship between reaction kinetic of halogen exchange and the stability of the perovskite NCs, which facilitates to understand and further improve the stability of perovskite and its optoelectronic devices.
期刊介绍：
The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid.
We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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