Structural characterization and temperature-dependent luminescence of CaF₂:Tb³⁺/Eu³⁺ glass ceramics

胡芳芳，赵张美，迟逢逢，韦先涛，尹民

Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China

摘 要：Tb³⁺/Eu³⁺ 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 Tb³⁺ to Eu³⁺ of CaF₂:Tb³⁺,Eu³⁺ 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 Tb³⁺ at 545 nm（⁵D₄→⁷F₅） to Eu³⁺ 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 Tb³⁺/Eu³⁺ co-doped CaF₂ glass ceramics may have prospective application in optical thermometry.

关键词：