Abstract
A dual-emitting phosphor LaOBr: Ce3+, Tb3+ was synthesized, and the corresponding temperature-dependent luminescent properties were systematically investigated. The dual-emitting phosphor exhibits an exactly contrary thermal dependence with respect to the blue emission of the Ce3+ sensitizer and the green emission of the Tb3+ activator. The unique energy transfer between Ce3+ and Tb3+ enables this luminescent thermometer to be highly temperature-sensitive over a wide temperature range. The fluorescence intensity ratio (FIR) of the blue and green emission bands peaked at 430 and 543 nm is found to have a well-fitted linear relationship with respect to temperature, and the emitting color shifts from blue to green when temperature rises from 273 K to 493 K. The results indicate that Ce3+, Tb3+ co-doped LaOBr phosphor is a potential candidate for a ratiometric and colorimetric luminescent thermometer.
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