Abstract
The photoluminescence (PL) of CaGa4O7 compound doped with Eu3+ ions is studied. It is shown that room temperature emission spectrum of CaGa4O7 compound consists of groups of lines in the red spectral region, caused by electronic transitions 5D0→7Fj(j = 1,2,3,4) in Eu3+ ions with the most intensive lines at 612nm and 615nm. It is evaluated that low local symmetry of Eu3+ ion appears in the presence of several lines for each transitions. The PL decay constants were found to be in the range of 1.1–1.3ms. Non-exponential rise was observed in the beginning of PL kinetics and assumed with energy transfer between Eu3+ ions in different sites in host lattice. Weak thermal quenching is shown in the temperature range of 10–300K. Extreme stability of PL spectra and efficiency in a wide excitation intensity range of 104–108W/cm2 were achieved. A slight emission efficiency reversible droop by only 25% is found to be at the excitation intensities from 2·107W/cm2 to 108W/cm2.
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