Abstract
Optical temperature sensing based on the fluo-rescence intensity ratio(FIR)of red emission for lan-thanide ions holds significant relevance in non-contact temperature measurement for biological application.In this study,the perovskite-structured KZnF3 is utilized as a host material for Er3+to achieve a high-purity upconversion(UC)red emission.The observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er3+.Group theory is employed to decompose the spectral branching of Er3+ under the point group symmetry of KZnF3,allowing for the derivation of Stark splitting energy levels induced by the crystal field effect.The optical temperature-sensing behavior of the red UC luminescence was investigated,specifically examining the FIR of the splitting sub-peaks,which exhibited an expo-nential relationship with temperature.The KZnF3∶Yb3+,Er3+demonstrated a relative sensitivity(Sr)of 0.00182％·K-1 at 298 K,highlighting its excellent response to temperature.Ex vivo bio-thermometry exper-iments conducted on chicken breast validated the mate-rial's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to temperature.These results establish KZnF3:Yb3+,Er3+as a promising material for optical thermometry in various biological applications.
基金项目
Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)()
"Qinglan Project"Young and Middleaged Academic Leaders Program of Jiangsu Province()
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites()
NETL
NSTL
万方数据