Tb^3＋/Eu^3＋ co-doped transparent glass ceramics containing CaF2 nanocrystals were successfully synthesized by high temperature melt-quenching method and subsequent heating. The structure and morphology of the sample...Tb^3＋/Eu^3＋ co-doped transparent glass ceramics containing CaF2 nanocrystals were successfully synthesized by high temperature melt-quenching method and subsequent heating. The structure and morphology of the samples were investigated by X-ray diffraction（XRD）, transmittance electron microscopy（TEM）, high resolution TEM（HRTEM） and selected area electron diffraction（SAED）. The photoluminescence properties and energy transfer process from Tb^3＋ to Eu^3＋ of CaF2：Tb^3＋,Eu^3＋ phosphors were also investigated through excitation spectra and decay curves. In addition, the emission spectra of the glass ceramics in a wide temperature range from 21 to 320 K were recorded under the excitation of 485 nm. It was found that the fluorescence intensity ratios of Tb^3＋ at 545 nm（^5D4→^7F5） to Eu^3＋ at 615 nm（^5D0→^7F2） was highly temperature-dependent with an approximate linear relationship, and the temperature sensitivity was about 0.4%/K. It is expected that the investigated Tb^3＋/Eu^3＋ co-doped CaF2 glass ceramics may have prospective application in optical thermometry.展开更多
基金Project supported by the National Key Basic Research Program of China(2013CB921800)the National Natural Science Foundation of China(11274299,11374291,11574298,11404321)
文摘Tb^3＋/Eu^3＋ co-doped transparent glass ceramics containing CaF2 nanocrystals were successfully synthesized by high temperature melt-quenching method and subsequent heating. The structure and morphology of the samples were investigated by X-ray diffraction（XRD）, transmittance electron microscopy（TEM）, high resolution TEM（HRTEM） and selected area electron diffraction（SAED）. The photoluminescence properties and energy transfer process from Tb^3＋ to Eu^3＋ of CaF2：Tb^3＋,Eu^3＋ phosphors were also investigated through excitation spectra and decay curves. In addition, the emission spectra of the glass ceramics in a wide temperature range from 21 to 320 K were recorded under the excitation of 485 nm. It was found that the fluorescence intensity ratios of Tb^3＋ at 545 nm（^5D4→^7F5） to Eu^3＋ at 615 nm（^5D0→^7F2） was highly temperature-dependent with an approximate linear relationship, and the temperature sensitivity was about 0.4%/K. It is expected that the investigated Tb^3＋/Eu^3＋ co-doped CaF2 glass ceramics may have prospective application in optical thermometry.
