期刊
MATERIALS RESEARCH BULLETIN
卷 129, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.110869
关键词
Phosphor; Lanthanide; Dual luminescent centers; Temperature Sensing; Fluorescence Intensity Ratio
资金
- National Natural Science Foundation of China [21401130]
- Opening Research Fund of the State Key Laboratory of Rare-Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [RERU2014005]
- Shanghai Young College Teachers Training Project [slg15057]
We proposed the FIR method-based optical materials involving dual luminescent centers of Bi3+ and lanthanide (Ln): Eu3+/Sm3+. Resulted from the f-f characteristic transition of Eu3+, the tunable color region changing from cyan to jacinth with the augment of Eu3+/Bi3+ ratio exists . Owing to Bi3+ being susceptive to crystal surroundings, and asymmetric crystal sites of Sm3+ in the host, phenomena respectively involving redshift and energy level splitting occur. In addition, benefiting from the unshielded 3d orbitals, the thermal quenching of Bi3+ ion occurs through energy-level crossing relaxation (ELCR), while the heating quenching of Ln(3+) ions takes place due to the shielded 4f orbitals via multi-phonon deexcitation (MPD). Considering the symmetric crystal environment, stronger sensitivity compared with Sm3+ ion to the outer environment due to its smaller value of thermal activation energy and the weaker crystal field than CAZO:Bi3+,Sm3+, a more excellent temperature sensing sensitivity is excepted by applying Eu3+ as the temperature-detecting signal.
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