Aopeng Zhang, Wenfang Pei, Adeniyi Michael Bukunmi, Wei Wu, Wei Xia, Xinyu Yang
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引用次数: 0
Abstract
Organic-inorganic hybrid perovskite single crystals have emerged as promising candidates for nonlinear optical applications due to their exceptional optoelectronic properties. In this study, through doping MAPbBr3 single crystals with alkali metals K+ and Rb+, the crystal cell structure was adjusted. The defect densities of MA0.95K0.05PbBr3 and MA0.97Rb0.03PbBr3 single crystals were reduced to cm−3 and cm−3 respectively, almost half that of MAPbBr3 single crystals, which suppresses carrier recombination caused by defects. Using transient absorption spectroscopy to track carrier dynamics in the samples, it was revealed that doping with alkali metals K+ and Rb+ effectively reduces the interaction between the central cation and the Pb-Br framework, greatly slowing hot carrier relaxation, increasing carrier mobility, and reducing defect density. The nonlinear absorption coefficients of MA0.95K0.05PbBr3 and MA0.97Rb0.03PbBr3 single crystals were measured to increase to cm/MW and cm/MW respectively, an order of magnitude greater than MAPbBr3 single crystals. Our research opens a new development path for potential saturable absorbers in ultrashort pulse lasers.
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.