Impact of Lu/Gd ratio and activator concentration on structure and scintillation properties of LGSO:Ce crystals

Effect of substitution of lutetium by gadolinium on emission characteristics of (Lu_xGd_1-x)_2SiO_5: Sm^3+ single crystals

“…However, when the symmetry of LGSO changes to P2 1 /c, the Lu 3+ ions occupy sites coordinated by seven oxygens (LnO 7 ) whereas the Gd 3+ are located in sites with nine-oxygen coordination. In accordance with [13,14], Gd 3+ ions in the LGSO structure must tend to replace Lu 3+ ions in Lu1 sites where the average Lu-O distance of 2.32 Å is larger than that of 2.23 Å for Lu2 site. The 4 G 5/2 → 6 H 5/2 emission spectrum in LGSO containing 81 at% of Gd 3+ is dominated by a strong and narrow line at 17794 cm −1 (562 nm).…”

“…It was demonstrated by Sidletskiy et. al [13,14] that in Ce:(Lu x Gd 1-x ) 2 SiO 5 with different degree of cation substitution, Lu 3+ ions favour the LnO 6 sixfold polyhedra whereas Gd 3+ ions preferably occupy LnO 7 sevenfold ones as long as the C2/c lattice symmetry is protected. However, when the symmetry of LGSO changes to P2 1 /c, the Lu 3+ ions occupy sites coordinated by seven oxygens (LnO 7 ) whereas the Gd 3+ are located in sites with nine-oxygen coordination.…”

“…Solid solution crystals (Lu x Gd 1-x ) 2 SiO 5 (LGSO) have been considered aiming to overcome these drawbacks. Investigation on growth, crystal structure and scintillation characteristics of cerium-doped LGSO host has revealed that LGSO forms crystals belonging to the C2/c space group inherent to LSO for x value above 0.2 and to the P2 1 /c space group inherent to GSO for x value below 0.2 [12][13][14]. In a more recent paper it has been reported that the change of the LGSO symmetry occurs at 0.15 < x < 0.17 [15].…”

Structure–Property Correlations in a Ce-Doped (Lu,Gd)2SiO5:Ce Scintillator

“…LGSO:Ce crystals with Lu concentration in the medium concentration range (30 -60 %) were proposed by us in [15]. They demonstrated light output around 400 % relatively to BGO, energy resolution 6.9 -7.3 %, and afterglow level 0.02 -0.1 % after 5 ms (by 2-3 orders lower compared to LSO:Ce LGSO:Ce,Ca scintillator are presented for the first time.…”

Growth and luminescent properties of Lu2SiO5:Ce and (Lu1−xGdx)2SiO5:Ce single crystalline films

“…To improve the scintillation properties of LSO:Ce crystals, degraded by presence of the oxygen vacancies acting as electron trapping centers [17,18], the Gd-admixed (Lu 1 À x Gd x ) 2 SiO 5 :Ce (LGSO:Ce) [19,20] and Y-admixed (LuY) 2 SiO 5 :Ce SC scintillators [21,22] were also developed. The increase of the distance between Ce 3 þ ions as emission centers and oxygen vacancies as trapping center in LGSO:Ce and LYSO:Ce SCs might be one of the reasons of the observed significant decrease of the content of slow components in scintillation decay of the latter crystals with respect to LSO:Ce SC [17][18][19][20][21][22].…”