Photoluminescence studies on energy transfer processes in cerium-doped Gd3Al2Ga3O12 crystals

Novel Phenomenon of Scintillation Performances with the Component Variation in the Mg Co-/Nondoped GAGG:Ce Crystal

“…Notably, the excitation peak enhances more significantly with increasing Ce concentration after Mg 2+ codoping, which supports that the Mg 2+ codoping can affect the content of Ce 3+ ions in the GAGG:Ce crystal . The excitation peaks around 310 and 275 nm are attributed to spin- and parity-forbidden 4f–4f transitions, 8 S 7/2 – 6 P 7/2 and 8 S 7/2 – 6 I 7/2 in Gd 3+ ions (Figure b,d). , According to ref , the Gd 3+ → Ce 3+ energy transfer is mainly transferred from the antisite Gd 3+ ions to the Ce 3+ ions. In Figure b,d, the spectral peaks associated with Gd ions were suppressed after Mg 2+ codoping, which suggests that Mg 2+ codoping can suppress antisite defects.…”

Time-resolved photoluminescence spectroscopy of Ce:Gd3Al2Ga3O12 crystals

“…It has been reported that a thermoluminescence glow curve of the Ce:GAGG crystal excited with 3.49 eV photons mainly consists of three peaks at 84, 175, and 244 K. 14) Referring to this result, we notice that rapid increases in integrated intensities of fast and slow components correlate well with the appearance of TSL glow peaks at 84 and 175 K, respectively. Thus, it is likely to attribute such increases to the thermal release of trapped electrons.…”

Optical characteristics of single crystal Gd3Al2Ga3O12 : Ce

“…3 and suggest that the α(λ) and k(λ) spectral functions are nonmonotonic and have expressed absorption bands peaking at 440, 340, 300-310, 270 and 230 nm. Earlier [8,9,[26][27][28][29] the absorption bands were accounted for as follows:…”