Energy transfer-facilitated chromaticity-tunable photoluminescence in Er3+ and Eu3+ co-doped Ca2MgWO6 phosphors for lighting and sensing applications

• CMW: Er 3+ , Eu 3+ phosphors were synthesized using solid-state reaction method. • Under 381 nm excitation, Er 3+ → Eu 3+ energy transfer enabled spectral tunability. • The optimized phosphor exhibited a direct optical band gap of 3.35 eV. • Phosphor retained 37 % of its initial emission intensity at 483 K. • Phosphor showed good sensitivity of 0.975 % K −1 in the linear model at 483 K. This study comprehensively evaluates the optical, and thermal characteristics of novel Ca 2 MgWO 6 : 2 %Er 3+ , xEu 3+ (x = 0, 4, 8, 12, 16, and 20 mol%) phosphors synthesized via the flux-assisted solid-state reaction. First, we confirm the successful formation of the desired phase using X-ray diffraction analysis. Among the prepared phosphors, the optimum concentration of Eu 3+ was determined to be 16 mol% before the concentration quenching, primarily arising from the dipole-quadrupole interactions. Upon 381 nm excitation, efficient energy transfer from Er 3+ to Eu 3+ was observed and this resulted in spectral tunability. The phosphor exhibited a direct optical band gap of 3.35 eV and temperature-dependent photoluminescence analysis revealed substantial emission retention at elevated temperatures, with a quenching temperature of 399.38 K. The optimized phosphor demonstrated excellent temperature-sensing capabilities, exhibiting peak relative sensitivities of 0.975 % K −1 and 0.764 % K −1 for linear and quadratic fitting models, respectively. These properties position the material as a noteworthy candidate for next-generation optical thermometry and solid-state lighting applications.