SrMoO 4 :Yb 3+ /Ho 3+ /Na + With Enhanced Rising‐Edge‐Based Temporal Upconversion Luminescence Color Tuning for Advanced Photonics Applications

ABSTRACT 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.