Fabrication and optical thermometry of transparent glass‐ceramics containing Ag@NaGdF₄: Er³⁺ core‐shell nanocrystals

Abstract

Novel transparent glass‐ceramics containing Ag@NaGdF4:Er3+ core‐shell nanocrystals were fabricated successfully by a melt‐quenching method and subsequent heating. X‐ray diffraction and transmission electron microscope images show that precious metal Ag is successfully encapsulated by the NaGdF4:Er3+ nanoparticles to form an Ag@NaGdF4:Er3+ core‐shell structure in glass matrix. Compared with the NaGdF4:Er3+ glass‐ceramics, Ag@NaGdF4:Er3+ core‐shell glass‐ceramics shows the great enhancement of emission intensity. The thermometric parameters such as fluorescence emission intensity, fluorescence intensity ratios of thermally coupled levels (2H11/2/4S3/2), and temperature sensitivity can be effectively controlled by changing the Ag concentration. When 0.15 mol% Ag is co‐doped, the sensitivity of SR in Ag@NaGdF4:Er3+ core‐shell glass‐ceramics reaches a maximum value. This work presents a new method to enhance emission intensity and optical thermometry ability of NaGdF4:Er3+ through constructing Ag@NaGdF4:Er3+ core‐shell structure.

Influence of Cr3+ on yellowish‐green UC emission and energy transfer of Er3+/Cr3+/Yb3+ tri‐doped zinc silicate glasses

“…In recent years, the upconversion (UC) emission of rare‐earth (RE 3+ ) co‐doped in the glass/glass‐ceramics materials continues to be extensively studied by their potential applications in many fields such as biomedical imaging, three‐dimensional color display, 1,2 optical thermometry, 3 temperature sensors, 4 solar cells, 5 and biomarkers 6 . There have been many studies aiming to enhance UC emission of some typical RE 3+ ions due to their different applications.…”

Terbium(III)-thiacalix[4]arene nanosensor for highly sensitive intracellular monitoring of temperature changes within the 303–313 K range

“…Thus, both the nature of the doped or co-doped lanthanide ions and the architecture of the lanthanide-doped NPs are the tools for tuning their temperature sensitivity [7][8][9][10]19 . However, the temperature sensitivities (S) defined as the rate of change of the thermo-sensitive parameter with temperature are typically low, usually being below 1% K −1 at the temperatures about 300 K for the major part of the reported lanthanide-doped inorganic NPs [7][8][9][10][11]18,19,[25][26][27][28] .…”