High-Pressure Near-Infrared Luminescence Studies of Fe³⁺-Activated LiGaO₂

Abstract

A 0.25% iron (Fe3+)-doped LiGaO2 phosphor was synthesized by a high-temperature solid-state reaction method. The phosphor was characterized utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), high-pressure photoluminescence, and photoluminescence decay measurement techniques using diamond anvil cells (DACs). The powder X-ray analysis shows that the phosphor is a β polymorph of LiGaO2 with an orthorhombic crystallographic structure at room temperature. The SEM result also confirms the presence of well-dispersed micro-rod-like structures throughout the sample. The photoluminescence studies in the near-infrared (NIR) range were performed at ambient, low-temperature, and high-pressure conditions. The synthesized phosphor exhibits a photoluminescence band around 746 nm related to the 4T1 → 6A1 transition with a 28% quantum efficiency at ambient conditions, which shifts toward longer wavelengths with the increase of pressure. The excitation spectra of Fe3+ are very well fitted with the Tanabe–Sugano crystal-field theory. The phosphor luminescence decays with a millisecond lifetime. The high-pressure application transforms the β polymorph of LiGaO2 into a trigonal α structure at the pressure of about 3 GPa. Further increase of pressure quenches the Fe3+ luminescence due to the amorphization process of the material. The prepared phosphor exhibits also mechanoluminescence properties in the NIR spectral region.

Temperature and pressure dependent luminescence mechanism of a zinc blende structured ZnS:Mn nanophosphor under UV excitation

“…61 Another pressure-induced study of the Fe 3+ -doped oxide sample belonging to the same d 5 class of systems shows a luminescence quenching near 14 GPa due to phase transition. 62 Despite the quenching of the 4 T 1 → 6 A 1 luminescence band (due to the aforementioned phase transition and a decrease in the distance between the 4 T 1g level and the non-radiative 2 T 2 level with the increase of pressure), it is evident that the overall decay times of the Mn 2+ ions in ZnS are weakly affected by the increase in strength of the crystal field.…”