Great improvement in intensity and thermal stability of Ca9Ga(XO4)7: Cr3+ near-infrared photoluminescence by next nearest coordination substitution

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-12-12 DOI:10.1016/j.jlumin.2024.121028

Shifang Wang , Mingzheng Sun , Xiaolang Fan , Bowei Liu , Chuangchuang Qiao , Shuang Jing , Xufeng Zhou , Wei Li , Yangbo Wang , Huaiyong Li

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引用次数: 0

Abstract

Broad band near-infrared emitting phosphors activated with Cr³⁺ ions have great potential in a variety of applications. The luminescence efficiency and thermal stability are two critical parameters that are highly concerned in practical applications. In this work, a series of Cr³⁺ ion-activated Ca₉Ga(PO₄)_x(VO₄)_7-x were synthesized. The photoluminescence (PL) properties of Cr³⁺ were studied as functions of coordination environment, Cr³⁺ concentration and temperature. The coordination environment of Cr³⁺ ions is modified by gradually substitution of P by V without change the crystal structure of the host lattice. A continuous solid solution is formed, and the cell parameters and volume increase monotonically with V content. Great improvement in the intensity is observed for Ca₉Ga(PO₄)_3.5(VO₄)_3.5, which increases by 26 and 2.4 times than the parents compositions Ca₉Ga(PO₄)₇ and Ca₉Ga(VO₄)₇, respectively. Decay dynamic analysis suggests that both coordination environment modification and reduction of quenching center responsible for the great enhancement. An optimized concentration of 3.0 % is revealed and the intensity at 433 K maintains 81.1 % of the intensity at 293 K, respectively.

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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.