SrMoO4:Yb3+/Ho3+/Na+ With Enhanced Rising-Edge-Based Temporal Upconversion Luminescence Color Tuning for Advanced Photonics Applications

Temporal modulation of upconversion luminescence (UCL) has attracted considerable interest. However, rise-edge-based tuning strategy is often hampered by severe luminescence quenching, underscoring the need for rational design strategies that simultaneously optimize temporal dynamics and absolute UCL output. Herein, by introducing Na + ions as charge compensators, we overcame the low solubility of Yb 3+ in the SrMoO 4 host lattice and achieve a quenching concentration of up to 20 mol%, far exceeding typical levels in aliovalent doping systems. Coupled with the concomitant lattice distortion, this strategy enhances the excitation energy absorption of Yb 3+ , the energy transfer efficiency from Yb 3+ to Ho 3+ , and the radiative transition rate of Ho 3+ . The green and red UCL intensities exhibit enhancements of >3000-fold and >2000-fold, respectively, yielding a high upconversion quantum yield (UCQY) of 4.11 % and excellent temporal color tunability. These findings provide valuable insights for developing UCL materials capable of efficient dynamic luminescence control.