Optical and scintillating properties of Cs-doped (PEA)2PbBr4 perovskite crystals

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-03-13 DOI:10.1016/j.jlumin.2025.121188

Francesco Maddalena , Michal Makowski , Md Abdul Kuddus Sheikh , Dominik Kowal , Romakanta Bhattarai , Marcin Eugeniusz Witkowski , Konrad Jacek Drozdowski , Muhammad Haris Mahyuddin , Trevor David Rhone , Winicjusz Drozdowski , Cuong Dang , Muhammad Danang Birowosuto

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引用次数: 0

Abstract

Inorganic ion doping has emerged as a promising approach to enhance the scintillation properties of two-dimensional (2D) organic-inorganic hybrid perovskite (OIHP) crystals, particularly by increasing mass density and effective atomic number (Z). In this study, we investigate the effects of cesium (Cs) doping on (PEA)₂PbBr₄. Our findings indicate that Cs-doping in (PEA)₂PbBr₄, especially above 5 %, results in the formation of local quasi-2D domains within the grown crystal and even bulk domains at higher concentrations. This leads to an overall narrowed band gap, reduced by as much as 0.2 eV compared to the undoped material. Cs-doping also broadens photoluminescence (PL) spectra and significantly accelerates PL decay times, achieving fast as (1.1 ± 0.1) ns, with an average decay time reduction of 81 % compared to undoped crystals. Furthermore, the inclusion of Cs ions shortens scintillation decay times, reaching as fast as (51.6 ± 5.7) ns, with an average decrease of 10 %. Notably, Cs-doping at a threshold concentration of 5 % leads to a 30 % improvement in light yields (LYs). These results demonstrate that Cs-doping significantly enhances the performance of (PEA)₂PbBr₄ crystals, making them particularly well-suited for high LYs and fast timing applications, such as photon counting and positron emission tomography. This study underscores the potential of Cs-doped OIHP crystals in advancing the capabilities of scintillation-based radiation detection technologies.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

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.