posted on 2024-01-22, 18:36authored byHitoshi Yusa, Masashi Miyakawa
Cr3+-doped Ga2O3 crystals
with
a corundum structure were synthesized at high temperature and high
pressure, and their excitation as well as fluorescence properties
were evaluated. The crystals were green under white light illumination
but deep red when exposed to ultraviolet light. This can mainly be
attributed to R1 and R2 fluorescence spectra caused by the Cr3+ transition.
The pressure-dependence of their fluorescence spectra is comparable
with ruby (Al2O3:Cr3+), which is
currently often used as a pressure scale. The excitation spectrum
was shifted to the long-wavelength side compared with ruby, which
enabled excitation with long-wavelength lasers, even if the pressure
effect is considered. In addition, the R1 and R2 peaks were well-separated with
increasing pressure, which might have advantages over the ruby scale.