Chen K.-C. et al.RU-SHI LIU2021-08-032021-08-0320218974756https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106500058&doi=10.1021%2facs.chemmater.1c01041&partnerID=40&md5=98fa08f3e2c883d9add142a77fc6cb4ehttps://scholars.lib.ntu.edu.tw/handle/123456789/575861A chemical and mechanical pressure-induced photoluminescence tuning method was developed through the structural evolution and hydrostatic pressure involving phase transition. A series of Ga1.98-xAlxO3:0.02Cr3+ phosphors were synthesized. Structural evolution reveals a crystal phase change with the incorporation of Al ions. The luminescent analysis shows the broad-to-sharp emission process with a high internal quantum efficiency value (>90%). The high-pressure study reveals the emission from the exchange-coupled Cr3+ pairs and the phase transition under high pressure. Electron paramagnetic resonance indicates the distortion in the microstructures of the emission center. Finally, an ultra-broadband phosphor-converted light-emitting diode is achieved by utilizing the mixture of Ga1.18Al0.8O3:0.02Cr3+ and Ga1.18Sc0.8O3:0.02Cr3+ phosphors with a bandwidth of 209 nm and an output power of 119 mW. This study provides insights into the effect of chemical and mechanical pressure on the Cr3+-doped materials and the development of high-quality near-infrared luminescent materials. ? 2021 American Chemical Society.Hydraulics; Hydrostatic pressure; Infrared devices; Paramagnetic resonance; Phosphors; Photoluminescence; Effect of chemicals; Exchange coupled; High pressure study; Internal quantum efficiency; Luminescent analysis; Luminescent material; Mechanical pressure; Structural evolution; Tuning[SDGs]SDG7journal article10.1021/acs.chemmater.1c010412-s2.0-85106500058