Dual-emitting Ce3+, Tb3+ co-doped LaOBr phosphor: Luminescence, energy transfer and ratiometric temperature sensing

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 307; pp. 291 - 299
• Main Authors: Zhang, Xinguo, Huang, Yumei, Gong, Menglian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2017
• Subjects: Energy transfer; LaOBr: Ce3+, Tb3; Luminescent property; Ratiometric temperature sensing; LaOBr: Ce3+, Tb3; Ratiometric temperature sensing; Luminescent property; Energy transfer
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2016.08.087

[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.