Chemical and Mechanical Pressure-Induced Photoluminescence Tuning via Structural Evolution and Hydrostatic Pressure
Kuan‐Chun Chen, Mu‐Huai Fang, Wen‐Tse Huang, Mikołaj Kamiński, Natalia Majewska, Tadeusz Leśniewski, Sebastian Mahlik, Grzegorz Leniec, S.M. Kaczmarek, Chia‐Wei Yang, Kuang‐Mao Lu, Hwo‐Shuenn Sheu, Ru‐Shi Liu
Abstract
A 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.