Abstract
Here, this study reports single-band red upconversion emission in β-Ba(2)ScAlO(5): Yb(3+)/Er(3+) phosphor by doping Mn(2+). The optimum concentration of Mn(2+) ions in β-Ba(2)ScAlO(5): Yb(3+)/Er(3+) phosphor was 0.20. The intensity of red and green emissions is increased by 27.4 and 19.3 times, respectively. Compared with the samples without Mn(2+) ions, the red-green integral strength ratio of β-Ba(2)ScAlO(5): Yb(3+)/Er(3+)/Mn(2+) sample was significantly increased by 28.4 times, reaching 110.9. The UCL mechanism was explored by analyzing the down-conversion luminescence spectra, absorption spectra, UCL spectra, and upconversion fluorescence lifetime decay curves of Yb(3+)/Er(3+)/Mn(2+) co-doped β-Ba(2)ScAlO(5). The enhancement of upconversion red light is achieved through energy transfer between defect bands and Er(3+) ions, as well as energy transfer between Mn(2+) ions and Er(3+) ions. In addition, the Mn(2+) doped β-Ba(2)ScAlO(5): Yb(3+)/Er(3+) red UCL phosphors have great potential for ambient temperature sensing in the 298-523 K temperature range. The maximum sensitivity of β-Ba(2)ScAlO(5): Yb(3+)/Er(3+)/Mn(2+) phosphor as a temperature sensor at 523 K is 0.0247 K(-1).