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Temperature sensing behavior in Yb3+-Tb3+ and Eu3+ doped Ca2Gd8(SiO4)6O2 phosphors based on upconversion and downshifting luminescence.
- Source :
- Journal of Materials Science: Materials in Electronics; Jul2018, Vol. 29 Issue 14, p12061-12066, 6p
- Publication Year :
- 2018
-
Abstract
- To develop new phosphor materials for optical temperature sensing application, a series of Yb<superscript>3+</superscript>-Tb<superscript>3+</superscript> and Eu<superscript>3+</superscript> doped Ca<subscript>2</subscript>Gd<subscript>8</subscript>(SiO<subscript>4</subscript>)<subscript>6</subscript>O<subscript>2</subscript> (CGS) phosphors were designed by solid-state reaction method. Upon 980 nm excitation, the green emission of Tb<superscript>3+</superscript> was observed in the CGS:0.8Yb<superscript>3+</superscript>, xTb<superscript>3+</superscript> (0.08 ≤ x ≤ 1.2) phosphors, which could be mainly owing to the cooperative energy transfer from Yb<superscript>3+</superscript> to Tb<superscript>3+</superscript>. The corresponding upconversion (UC) luminescence mechanism was studied by using the dependence of UC emission intensity on excitation powder. The temperature-dependence indicates that the ratio of the Tb<superscript>3+</superscript> emission intensities of I<subscript>5D4</subscript> and I<subscript>5D3</subscript> changes with temperature, which shows a linear relationship. The high absolute sensitivity was achieved to be about 0.431 K<superscript>−1</superscript>. Upon 463 nm excitation, the Eu<superscript>3+ 5</superscript>D<subscript>0,1</subscript>-<superscript>7</superscript>F<subscript>J</subscript> transitions were found in the Eu<superscript>3+</superscript>-activated CGS. The investigation on temperature-dependence reveals that with increasing temperature the intensities of <superscript>5</superscript>D<subscript>0</subscript>-<superscript>7</superscript>F<subscript>J</subscript> transitions decrease but those of <superscript>5</superscript>D<subscript>1</subscript>-<superscript>7</superscript>F<subscript>J</subscript> transitions increase gradually, owing to the thermally coupled <superscript>5</superscript>D<subscript>0</subscript> and <superscript>5</superscript>D<subscript>1</subscript> levels. The fluorescence lifetime based temperature sensing properties was studied in this sample. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOSPHORS
DETECTORS
TEMPERATURE
LUMINESCENCE
PHYSICS instruments
Subjects
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 29
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 130276741
- Full Text :
- https://doi.org/10.1007/s10854-018-9312-9