| Autor: |
Zhydachevskyy Y; Institute of Physics, Polish Academy of Sciences, aleja Lotników 32/46, Warsaw02-668, Poland., Mykhaylyk V; Diamond Light Source, Harwell Campus, DidcotOX11 0DE, U.K., Stasiv V; Institute of Physics, Polish Academy of Sciences, aleja Lotników 32/46, Warsaw02-668, Poland., Bulyk LI; Institute of Physics, Polish Academy of Sciences, aleja Lotników 32/46, Warsaw02-668, Poland., Hreb V; Lviv Polytechnic National University, South Bandera Street 12, Lviv79013, Ukraine., Lutsyuk I; Lviv Polytechnic National University, South Bandera Street 12, Lviv79013, Ukraine., Luchechko A; Ivan Franko National University of Lviv, Tarnavskogo Street 107, Lviv79017, Ukraine., Hayama S; Diamond Light Source, Harwell Campus, DidcotOX11 0DE, U.K., Vasylechko L; Lviv Polytechnic National University, South Bandera Street 12, Lviv79013, Ukraine., Suchocki A; Institute of Physics, Polish Academy of Sciences, aleja Lotników 32/46, Warsaw02-668, Poland. |
| Abstrakt: |
In this study, we carried out a detailed investigation of the photoluminescence of Mn 4+ in Ga 2 O 3 -Al 2 O 3 solid solutions as a function of the chemical composition, temperature, and hydrostatic pressure. For this purpose, a series of (Al 1- x Ga x ) 2 O 3 :Mn 4+ ,Mg phosphors ( x = 0, ..., 0.1.0) were synthesized and characterized for the first time. A detailed crystal structure analysis of the obtained materials was done by the powder X-ray diffraction technique. The results of the crystal structure and luminescence studies evidence the transformation of the ambient-pressure-synthesized material from the rhombohedral (α-type) to monoclinic (β-type) phase as the Ga content exceeds 15%. Spectroscopic features of the Mn 4+ deep-red emission, including the temperature-dependent emission efficiency and decay time, as well as the possibility of their tuning through chemical pressure in each of these two phases were examined. Additionally, it has been shown that the application of hydrostatic pressure of ≥19 GPa allows one to obtain a corundum-like α-Ga 2 O 3 :Mn 4+ phase. The luminescence properties of this material were compared with β-Ga 2 O 3 :Mn 4+ , which is normally synthesized at ambient pressure. Finally, we evaluated the possibility of application of the studied phosphor materials for low-temperature luminescence thermometry. |
