Abstract
Under the excitation of ultraviolet, X-ray, and mechanical stress, intense orange luminescence (Mn2+, 4T1 → 6A1) can be generated in Mn2+-doped SrZn2S2O crystal in orthorhombic space group of Pmn21. Herein, the multiple energy conversion in SrZn2S2O:Mn2+, that is, photoluminescence (PL), X-ray-induced luminescence, and mechanoluminescence, is investigated. Insight in luminescence mechanisms is gained by evaluating the Mn2+ concentration effects. Under the excitation of metal-to-ligand charge-transfer transition, the most intense PL is obtained. X-ray-induced luminescence shows similar features with PL excited by band edge UV absorption due to the same valence band to conduction band transition nature. Benefiting much from trap levels introduced by Mn2+ impurities, the quenching behavior mechanoluminescence is more like the directly excited PL from Mn2+ d-d transitions. Interestingly, this concentration preference leads to varying degrees of spectral redshift in each mode luminescence. Further, SrZn2S2O:Mn2+ exhibits a good linear response to the excitation power, which makes it potential candidates for applications in X-ray radiation detection and mechanical stress sensing.
Highlights
Luminescent materials could somehow absorb electrical, optical, chemical, thermal, or mechanical energy and turn it into light emission through a radiative transition
It is proved that some new oxysulfide semiconductors that doped with luminescent ions, for instance, transitional metals and lanthanide ions doped CaZnOS (Huang, 2016; Huang et al, 2017; Du et al, 2019), SrZnOS (Chen et al, 2020), and BaZnOS (Li et al, 2016) single compounds as well as CaZnOS-ZnS heterojunctions (Peng et al, 2020) show novel ML performances that result in diverse applications
We found that 1,000◦C was the most suitable temperature for the preparation of SrZn2S2O:Mn2+ to get a good crystallinity while avoiding any decomposition (Supplementary Figure 1)
Summary
Luminescent materials could somehow absorb electrical, optical, chemical, thermal, or mechanical energy and turn it into light emission through a radiative transition. It is proved that some new oxysulfide semiconductors that doped with luminescent ions, for instance, transitional metals and lanthanide ions doped CaZnOS (Huang, 2016; Huang et al, 2017; Du et al, 2019), SrZnOS (Chen et al, 2020), and BaZnOS (Li et al, 2016) single compounds as well as CaZnOS-ZnS heterojunctions (Peng et al, 2020) show novel ML performances that result in diverse applications Some oxysulfides, such as Gd2O2S-based luminescent material (Büchele et al, 2015), has been commercialized and confirmed to be good X-ray phosphors. The motion of metal attachment on ML film generates light emission, whereas the fiber collects the signal synchronously
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