High Pressure Investigation of Fluorescence Spectra and Levels for Gd2O2S:Eu

The fluorescence spectrum of Eu3+ doped in Gd2O2S has been investigated in the spectral region 21 500～11 500 cm-1 at 77 K and 300 K. The 122 spectral lines measured at 77 K and the 96 lines at 300K have been assigned. Thirty five of the thirty nine Stark levels of 5D0~2, 7F0~6 multiplets were identified. The emission spectra were also measured under high pressures up to 15 GPa. It was found that all the lines observed change to longer wavelength and their intensities decrease with increasing pressure. The six levels of 5D0~2 descent more rapidly than the levels of 7FJ. The stark splittings of 5D2 and 7F2~5 multiplets increase, but the splittings of 5D1 and 7F1 multiplets decrease under pressure.