Journal
JOURNAL OF LUMINESCENCE
Volume 167, Issue -, Pages 386-390Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2015.07.017
Keywords
Phosphor; Upconversion luminescence; Temperature sensing; Microwave-assisted hydrothermal
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Funding
- National Natural Science Foundation of China [11104023, 11374044, 11104024]
- Fundamental Research Funds for the Central Universities [3132014087, 3132014327]
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Yb3+/Er3+ co-doped alpha- and beta-phase NaYF4 nano-/micro-crystals were prepared through a microwave-assisted hydrothermal route. The crystal structure and microscopic morphology of the samples were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Frequency upconverted emissions from the two thermally coupled excited state H-2(11/2) and S-4(3/2) levels of Er3+ in both phases of phosphors were recorded at temperatures ranging from room temperature to 573 K under 980 nm infrared laser excitation. The time scanning upconversion spectra were investigated in detail to reveal the thermal effect induced by laser irradiation and the luminescent thermal stability of the two phases NaYF4 polycrystals. Comparison of the upconversion luminescence and the sensitivity between the two phases NaYF4 polycrystals indicated that beta-phase NaYF4 won much stronger. luminescent intensity, better luminescent thermal stability, and higher temperature sensitivity. (C) 2015 Elsevier B.V. All rights reserved.
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