期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 104, 期 3, 页码 694-701出版社
SPRINGER
DOI: 10.1007/s10971-022-05791-3
关键词
CaTiO3:Pr3+; Phosphors; Nanoparticles; Photoluminescence; Optical switching; Redox reaction
资金
- Nippon Sheet Glass Foundation for Materials Science and Engineering
- JSPS KAKENHI [JP20K05670]
Red-emitting CaTiO3:Pr3+ phosphor nanoparticles were successfully synthesized by a sol-gel method, exhibiting excellent optical properties. In comparison, CaTiO3:Pr3+ phosphor synthesized by a conventional solid-state reaction method demonstrated more defects and poorer optical properties. The study revealed a reversible dual luminescence/absorption switching in CaTiO3:Pr3+ sample, which can be achieved through oxidation and reduction treatments.
Red-emitting CaTiO3:Pr3+ phosphor nanoparticles were synthesized by a sol-gel method with a final heat treatment at a low temperature of 650 degrees C. For comparison, the CaTiO3:Pr3+ phosphor was also synthesized by a conventional solid-state reaction method conducted at 1250 degrees C. The two kinds of resultant CaTiO3:Pr3+ samples were revealed to differ largely in their microstructure and optical properties. Diffuse reflectance and photoluminescence measurements suggested that the sample from the solid-state reaction possessed a larger number of defects, which would deteriorate the optical properties, due to heating at high temperature. On the other hand, the sol-gel-derived sample exhibited much better optical properties and thus it was used for evaluating optical-switching phenomena upon redox treatments. In photoluminescence, three excitation bands were observed at 265, 335, and 375 nm for the red emission of the CaTiO3:Pr3+ sample, and one of them (375 nm) was more effective for inducing luminescence quenching by a reduction treatment at room temperature. A body color of the CaTiO3:Pr3+ sample was also changed from white to light yellow by the reduction due to the enhanced visible-light absorption. Such the dual luminescence/absorption switching was shown to be reversible with a subsequent oxidation and repeatable with a consecutive redox treatment.
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