Composition engineering of single crystalline films based on the multicomponent garnet compounds

LPE Growth of Single Crystalline Film Scintillators Based on Ce3+ Doped Tb3−xGdxAl5−yGayO12 Mixed Garnets

“…Such slower decay kinetics of the Ce 3+ luminescence is typical for Tb 3+ and Gd 3+ based SCF scintillators, where the cascade energy transfer via both sublattices of Gd 3+ and Tb 3+ cations is more complicated [36] in comparison with their YAG:Ce and LuAG:Ce SCF analogues, where the direct energy transfer from the garnet host to Ce 3+ ions dominates [21]. Alloying of Gd 3+ ions in Tb3Al5−yGayO12:Ce (PbO) SCFs in the concentration range x = 0-1.5 has an opposite effect than the Ga 3+ alloying and leads to the notable red shift of their CL spectra.…”

“…Generally, the Tb3−xGdxAl5−yGayO12:Ce SCF scintillators demonstrate the notably slower non-exponential kinetics similarly to their YAG:Ce and LuAG:Ce SCF counterparts [21,36]. Such slower decay kinetics of the Ce 3+ luminescence is typical for Tb 3+ and Gd 3+ based SCF scintillators, where the cascade energy transfer via both sublattices of Gd 3+ and Tb 3+ cations is more complicated [36] in comparison with their YAG:Ce and LuAG:Ce SCF analogues, where the direct energy transfer from the garnet host to Ce 3+ ions dominates [21]. The influence of Ga 3+ and Gd 3+ alloying on the scintillation decay of Tb3−xGdxAl5−yGayO12:Ce (PbO) SCFs was firstly considered in [36].…”

“…The estimation of the optimal content of Gd 3+ and Ga 3+ cations in Tb 3−x Gd x Al 5−y Ga y O 12 :Ce SCFs in the x = 1-1.5 and y = 2-3 ranges was firstly performed in [36]. We will explain such a choice in this work in more detail based on the results of their CL spectra (Figure 4a,b).…”

“…After that, the SCFs of Eu 3+ , Tb 3+ doped Gd 3 Al 5 O 12 (GGG) and Sc 3+ doped LuAG garnets [3,4], Tb 3+ and double Tb 3+ , Ce 3+ doped Lu 2 SiO 5 (LSO) orthosilicates [5][6][7][8][9][10][11][12][13][14], Ce 3+ , Tb 3+ and the traditional Y 3 Al 5 O 12 (YAG) substrates with a lattice constant of 12.003 Å from supercooled melt solutions using both BaO-B 2 O 3 -BaF 2 and PbO-B 2 O 3 fluxes. Firstly, the sets of optical quality perfect SCF samples-with x values in the 0-2.1 range, y values changing in the 0-2.85 range and thickness in the 16-38 µm range-were crystallized onto GAGG substrates with a square of 1 × 1 cm 2 with the (100) orientation (Figure 1, left) using the conventional PbO flux for more detail determination of the optimal ranges of Gd and Ga concentrations x and y, respectively, in comparison with work [36]. After that, other sets of optically good quality Tb 1.5 Gd 1.5 Al 5−y Ga y O 12 :Ce SCF samples-with y values changing in the 2-3.8 range and thickness in the 10.5-22 µm range-were also successfully crystallized onto GAGG substrates from novel lead-free BaO based flux (see Figure 1, middle and right figures, and Table 1).…”

“…Firstly, the sets of optical quality perfect SCF samples-with x values in the 0-2.1 range, y values changing in the 0-2.85 range and thickness in the 16-38 μm range-were crystallized onto GAGG substrates with a square of 1 × 1 cm 2 with the (100) orientation (Figure 1, left) using the conventional PbO flux for more detail determination of the optimal ranges of Gd and Ga concentrations x and y, respectively, in comparison with work [36].…”