Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn⁴⁺ doped tantalate phosphors

Abstract

Non-rare-earth Mn4+ doped tantalate (Sr2GdTaO6) phosphors exhibiting deep-red emission were synthesized. Afterward, the phase structure, morphology, and optical properties (e.g., emission spectra, concentration quenching, decay curves, thermal stability, and quantum...

Thermally stable rare-earth-free double perovskite phosphors toward dual-mode optical thermometry and dual-functional lighting sources

“…The ionic radii and coordination numbers of Lu 3+ ( r = 0.861 Å, CN = 6) and Sb 5+ ( r = 0.60 Å, CN = 6) are listed as potential matrix cation substitutions. 22,23 The difference in percentage radius ( D r ) can be utilized for evaluating the ion substitution probability using the following equation: 24 …”

A novel Mn4+‐activated far‐red Sr2MgWO6 phosphor: synthesis, luminescence enhancement, and application prospect

“…The value of Racah parameter B can also be calculated [28]: where x is represented as [29]: …”

Enhancing the luminescence performance of an LED-pumped Mn4+-activated highly efficient double perovskite phosphor with A-site defectsvialocal lattice tuning

“…This value is greater than the E a values of some other Mn 4+ ion-doped phosphors, such as CaMg 2 La 2 W 2 O 12 :Mn 4+ (E a = 0.258 eV) and Sr 2 GdTaO 6 :Mn 4+ (E a = 0.38 eV). 40,43 The thermal excitation barriers of the optimized phosphors were effectively improved, which was attributed to the tuning of the local lattice structure for the luminescent center after co-doping with the Ca 2+ ions. Comparing the cell parameters after refinement, the optimized phosphor has a shorter length between adjacent Mn 4+ ions.…”

“…Satisfactorily, the IQE values were significantly greater than those of other Mn 4+ ion-doped phosphors, such as Ca 14 Ga 10 Zn 6 O 35 :Ge 4+ , Li + , Mn 4+ (IQE = 50.9%), K 2 NaGaF 6 :Mn 4+ (IQE = 61.0%) and Sr 2 GdTaO 6 :Mn 4+ (IQE = 15.27%). 38,42,43 Furthermore, to better compare the luminescence performance, the IQE and thermal stability of twenty-two representative Mn 4+ -activated matrix materials reported in the last three years mainly were compared as shown in Table S5. † The IQE and thermal stability of the Mn 4+ -activated La 1.67 MgTaO 6 phosphor reported in this study far exceed those of other oxide matrix materials in Table S5 † and are close to those of oxyfluoride or fluorides.…”