Dual-emitting Ce3+, Tb3+ co-doped LaOBr phosphor: Luminescence, energy transfer and ratiometric temperature sensing
[Display omitted] •Dual-emitting LaOBr: Ce3+, Tb3+ phosphor is studied to realize ratiometric temperature sensing.•The intensity ratio of Ce3+ and Tb3+ emission is used as the thermometric parameter (Δ=ICe/ITb).•LaOBr: Ce3+, Tb3+ has wide temperature sensing range (293–443K) with sensitivity of 0.42...
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Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 307; pp. 291 - 299 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.01.2017
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•Dual-emitting LaOBr: Ce3+, Tb3+ phosphor is studied to realize ratiometric temperature sensing.•The intensity ratio of Ce3+ and Tb3+ emission is used as the thermometric parameter (Δ=ICe/ITb).•LaOBr: Ce3+, Tb3+ has wide temperature sensing range (293–443K) with sensitivity of 0.42%K−1.•This research might provide a new path for the exploration of luminescent temperature sensors.
A series of broadband UV-excited and dual-emitting LaOBr: Ce3+, Tb3+ phosphors were synthesized by solid state reaction. Luminescent property, energy transfer behavior, thermal stability and ratiometric temperature sensing performance were investigated. Under single NUV excitation, LaOBr: Ce3+, Tb3+ exhibited both blue Ce3+ emission band and sensitized green Tb3+ emission peak, and the color of high-brightness emission can be tuned from blue to green by changing Ce3+/Tb3+ ratio. The Ce3+-Tb3+ energy transfer efficiency is determined to be 87.7% with critical distance of 12.6Å. The application potential of LaOBr: Ce3+, Tb3+ in optical thermometry was studied by exploiting the temperature sensitivity of the fluorescent intensity ratio (blue/green). It is found that fluorescent intensity ratio of LaOBr: Ce3+, Tb3+ displays linear correlation with temperature in a wide range of 293–433K with high sensitivity of 0.42%K−1, indicating that it could be a good candidate for ratiometric optical thermometry. |
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ISSN: | 1385-8947 1873-3212 |
DOI: | 10.1016/j.cej.2016.08.087 |