Luminescent properties and fluorescence intensity ratio-based optical thermometry of Dy3+/Eu3+ co-activated oxyfluoride glass–ceramics
摘要
Dy3+/Eu3+ co-doped K3YF6 oxyfluoride glass–ceramics were synthesized via high-temperature melt-quenching, and their luminescent and optical thermometric properties were comprehensively studied. Under 350 nm excitation, Dy3+ ions exhibited blue and yellow emissions, while Eu3+ ions emitted intense red light Energy transfer from Dy3+ to Eu3+ was confirmed through spectral overlap, lifetime analysis, and transfer efficiency calculations, with a maximum efficiency of 39.7%, driven mainly by electric dipole–dipole interactions. The emission color can be precisely tuned by adjusting Eu3+ concentration or excitation wavelength. White light emission with correlated color temperatures between 3873 and 4832 K was achieved under 350 nm excitation. The material showed excellent thermal stability, retaining 80% of its emission intensity at 423 K. Optical temperature sensing based on Dy3+/Eu3+ emission intensity ratios demonstrated high performance within 298–423 K, achieving maximum absolute and relative sensitivities of 0.48% K−1 and 0.79% K−1, respectively, and a temperature resolution of 0.0404 K.