| Optical and Photoluminescence Properties of the
MgAl2O4:M (M = Ti, Mn, Co, Ni) Phosphors: Calcination
Behavior and Photoluminescence Mechanism |
Shifa Wang,1, 2, * Huajing Gao,1, 3 Hong Yu,1 Peiying Li,1 Yanwu Li,1 Chaoli Chen,1 Yong Wang,1 Liang Yang4 and Zijuan Yin1
Pages : 221-231
DOI : 10.1080/0371750X.2020.1817789 |
| Abstract |
| MgAl2O4:M (M = Ti, Mn, Co, Ni) phosphors were successfully prepared by a
modified polyacrylamide gel method. Calcination temperature and metal
particle has significant effects on the phase transition, optical and color
properties of MgAl2O4:M phosphors. Ti, Mn, Co and Ni metal particles
introduced into the MgAl2O4 system can produce a variety of colours from
white, grayish black, blue to turquoise blue. Mn, Co and Ni metal particles
added into MgAl2O4 system can extend their light absorption to visible light
range, while the Ti metal particles clad into the system did not improve
significantly. Co metal particles appended into the MgAl2O4 system can cause
fluorescence quenching of emission peak at 395 nm and enhancement of
emission peak at 405 nm, while the Ti and Mn metal particles infused into
the system can bring the enhancement of visible emission peak at 425 nm.
The fluorescence quenching of the peak at 395 nm can be ascribed to the
wavelength of Co metal particles matching the surface plasmon absorbance
band of MgAl2O4:M phosphor. A reduction in emission intensity at 425 nm
can be assigned to electron transfer from the conduction band (CB) of
MgAl2O4 to the CB of metal particles causing non-radiative decay.
[Keywords: Phosphor, Optical properties, Calcination temperature,
Fluorescence quenching, Non-radiative decay] |
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