Upconversion luminescence and favorable temperature sensing performance of eulytite-type Sr₃Y(PO₄)₃:Yb³⁺/Ln³⁺ phosphors (Ln=Ho, Er, Tm).

ABSTRACT: Phase-pure eulytite-type Sr₃Y_0.88(PO₄)₃:0.10Yb³⁺,0.02Ln³⁺ upconversion (UC) phosphors (Ln = Ho, Er, Tm) were synthesized via gel-combustion and subsequent calcination at 1250°C. Their UC luminescence, temperature-dependent fluorescence intensity ratio of thermally and/or non-thermally coupled energy levels, and performance of optical temperature sensing were systematically investigated. The phosphors typically exhibit green, orange-red and blue luminescence under 978 nm NIR laser excitation for Ln = Er, Ho and Tm, respectively, which were discussed from two- and three-photon processes. The 524 nm green (Er³⁺), 657 nm red (Ho³⁺) and 476 nm blue (Tm³⁺) main emissions were analyzed to hav

SUBMITTER: Liu W 

PROVIDER: S-EPMC6764385 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature