Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence
M2La3Sb3O14 (M = Mg, Zn, Mn) exhibit ordered, and for Ca, disordered, rhombohedral pyrochlore systems. The photoluminescence (PL) and persistent luminescence (PersL) has been studied for the Mn-doped Mg, Zn and Ca systems in addition to M = Mn, with major focus upon the Mg system. The systems exhibi...
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Elsevier
2025-07-01
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| author | Hei-Yui Kai Ka-Leung Wong Peter A. Tanner |
| author_facet | Hei-Yui Kai Ka-Leung Wong Peter A. Tanner |
| author_sort | Hei-Yui Kai |
| collection | DOAJ |
| description | M2La3Sb3O14 (M = Mg, Zn, Mn) exhibit ordered, and for Ca, disordered, rhombohedral pyrochlore systems. The photoluminescence (PL) and persistent luminescence (PersL) has been studied for the Mn-doped Mg, Zn and Ca systems in addition to M = Mn, with major focus upon the Mg system. The systems exhibit differences in the Mn2+ and Mn4+ PL, and also in the PersL. In addition to bandgap excitation, the PersL of Mn2+ is due to metal-to-metal charge transfer (MMCT) rather than tunneling. The thermally stimulated luminescence (TL) and PersL decay kinetics have been fitted to give kinetics order and activation energies. The shallowest trap for M = Mg (Zn) has the activation energy of 0.42 eV (0.71 eV) and obeys second order kinetics. TL and temperature-stop (TSTOP) data can explain the anomalous temperature quenching of Mn2+ PL, whereas the Mn4+ PL follows a single barrier model. Using the determined vacuum referred binding energy (VRBE) data, the PersL results for M = Mg have been rationalized. The unusual properties enable a novel anti-counterfeiting material device to be constructed. Our results are especially relevant for Physical, Inorganic and Materials Chemists to understand and tune PL and PersL properties of solid state systems. It is found that disorder is not a criterion for improvement of PersL. |
| format | Article |
| id | doaj-art-e6877961bd044c0d83d1ebc6e477f06e |
| institution | OA Journals |
| issn | 2949-8228 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| spelling | doaj-art-e6877961bd044c0d83d1ebc6e477f06e2025-08-20T02:10:20ZengElsevierNext Materials2949-82282025-07-01810061010.1016/j.nxmate.2025.100610Mn2+ and Mn4+ competition in photoluminescence and persistent luminescenceHei-Yui Kai0Ka-Leung Wong1Peter A. Tanner2Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P. R. ChinaCorresponding authors.; Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P. R. ChinaCorresponding authors.; Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P. R. ChinaM2La3Sb3O14 (M = Mg, Zn, Mn) exhibit ordered, and for Ca, disordered, rhombohedral pyrochlore systems. The photoluminescence (PL) and persistent luminescence (PersL) has been studied for the Mn-doped Mg, Zn and Ca systems in addition to M = Mn, with major focus upon the Mg system. The systems exhibit differences in the Mn2+ and Mn4+ PL, and also in the PersL. In addition to bandgap excitation, the PersL of Mn2+ is due to metal-to-metal charge transfer (MMCT) rather than tunneling. The thermally stimulated luminescence (TL) and PersL decay kinetics have been fitted to give kinetics order and activation energies. The shallowest trap for M = Mg (Zn) has the activation energy of 0.42 eV (0.71 eV) and obeys second order kinetics. TL and temperature-stop (TSTOP) data can explain the anomalous temperature quenching of Mn2+ PL, whereas the Mn4+ PL follows a single barrier model. Using the determined vacuum referred binding energy (VRBE) data, the PersL results for M = Mg have been rationalized. The unusual properties enable a novel anti-counterfeiting material device to be constructed. Our results are especially relevant for Physical, Inorganic and Materials Chemists to understand and tune PL and PersL properties of solid state systems. It is found that disorder is not a criterion for improvement of PersL.http://www.sciencedirect.com/science/article/pii/S2949822825001285LuminescencePersistent luminescencePyrochloreSolid stateThermoluminescence |
| spellingShingle | Hei-Yui Kai Ka-Leung Wong Peter A. Tanner Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence Next Materials Luminescence Persistent luminescence Pyrochlore Solid state Thermoluminescence |
| title | Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence |
| title_full | Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence |
| title_fullStr | Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence |
| title_full_unstemmed | Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence |
| title_short | Mn2+ and Mn4+ competition in photoluminescence and persistent luminescence |
| title_sort | mn2 and mn4 competition in photoluminescence and persistent luminescence |
| topic | Luminescence Persistent luminescence Pyrochlore Solid state Thermoluminescence |
| url | http://www.sciencedirect.com/science/article/pii/S2949822825001285 |
| work_keys_str_mv | AT heiyuikai mn2andmn4competitioninphotoluminescenceandpersistentluminescence AT kaleungwong mn2andmn4competitioninphotoluminescenceandpersistentluminescence AT peteratanner mn2andmn4competitioninphotoluminescenceandpersistentluminescence |