Tuning Shortwave Infrared Emission Wavelengths by Chemical Pressure in Cr3+,Ni2+ Co-Doped Spinel Phosphors

A chemical pressure-induced shortwave infrared emission tuning strategy is constructed through partially inverse to normal and inverse spinel structural evolution. MgGa2O4:Cr3+,Ni2+ solid-solution systems with Al3+ and Sn4+ cation dopants are synthesized, and crystal phase change is observed. Electron paramagnetic resonance investigations reveal different results of how cation substitutions affect the microstructure of the Cr3+ clusters in two solid-solution series. The photoluminescence analysis presents tunable broadband Ni2+ emission, whose peak position can be effectively controlled from 1215 to 1465 nm via chemical pressure. Finally, phosphor-converted light-emitting diodes are prepared to demonstrate potential applications of shortwave infrared light sources on bio-image and anti-counterfeiting fields. Under 300 mA driving current, the radiant flux for Mg0.98Ga0.94AlO4:0.06Cr3+,0.02Ni2+ and Mg1.48Ga0.94Sn0.5O4:0.06Cr3+,0.02Ni2+ is 55.76 and 33.41 mW, respectively. This work provides insight into the chemical pressure affecting photoluminescent properties of Cr3+ cluster-contained spinel phosphors and reveals the importance of shortwave infrared light sources in various applications.
That dataset provides the raw data of room temperature excitation spectra, visible and near-infrared room-temperature emission spectra and decay profiles, temperature-dependent photoluminescence in visible and near-infrared range and decay profiles, and high-pressure-dependent visible and near-infrared photoluminescence of  MgGa2O4:Cr3+,Ni2+ with Ga and Sn dopants. Mg0.98Ga1.94−2xAl2xO4:0.06Cr3+,0.02Ni2+and Mg0.98+yGa1.94−2ySnyO4:0.06Cr3+,0.02Ni2+.
Related publication: Chen, K.-C.; Huang, M.-H.; Huang, W.-T.; Kamiński, M.; Cherng, D.-H.; Lu, K.-M.; Leniec, G.; Mahlik, S.; Liu, R.-S. Tuning Shortwave Infrared Emission Wavelengths by Chemical Pressure in Cr3+,Ni2+ Co-Doped Spinel Phosphors. Advanced Optical Materials 2025, 13 (19), 2500393. https://doi.org/10.1002/adom.202500393.
Funding: This work was financially supported by the National Science Center Poland Grant Opus No. 2019/33/B/ST3/00406 and the National Centre for Research and Development Poland Grant No. POLTAJ11/2023/41/IRPA/2024.