Large size single crystal growth of Lu3Al5O12:Pr and their uniformity of scintillation properties

Energy migration processes in undoped and Ce-doped multicomponent garnet single crystal scintillators

“…The latest studies of Ce 3+ [16], prepared by micro-pulling-down and Czochralski techniques, respectively. Several groups [17][18][19][20][21][22][23][24] studied scintillation characteristic of LuAG:Pr and found them very promising due to favorable combination of fast scintillation decay dominated by 20 nanosecond component and light yield approaching 20 000 phot/MeV with energy resolution 4.6%@662 keV. Moreover, its scintillation parameters do not deteriorate significantly up to 300 o C [25].…”

“…With increasing Ga content in the Ce-doped multicomponent garnets, the 5d 1 level and the conduction band become close because of the decrease in the crystal field strength and band gap, resulting in luminescence quenching by the thermal ionization. In 2012 Czochralski-grown 2-inch diameter Gd 3 Ga 3 Al 2 O 12 :Ce (GGAG:Ce) single crystal was obtained [21], which showed excellent characteristics, including high density 6.63 g/cm 3 , high light yield around 46 000 phot/MeV (this value is by 30-40% more than the value of the best LYSO:Ce scintillator reported so far), and excellent energy resolution 4.9%@622 keV. The advantage of these scintillators is very fast and intensive 5d→4f emission transitions of Ce 3+ centers in the green-yellow spectral range with dominating decay time about 50-60 ns.…”

“…On the other hand, in the case of the Pr 3+ -doped Gd 3+ containing multicomponent garnets, much worse scintillation performance was reported, namely the light yield values decrease down to 4 000-4 500 phot/MeV [21,33], due to resonance of the 5d 1 → 3 H 4 emission transition of Pr 3+ and 8 S→ 6 P x absorption transitions of Gd 3+ within 302-314 nm, which creates an additional nonradiative pathways away from the 5d 1 state of Pr 3+ [34,35].…”

Czochralski Growth and Properties of Scintillating Crystals

“…3) with the room temperature decay time of 20 ns which makes it more suitable for fast scintillator. Moreover, energy resolution of Pr-doped LuAG was found excellent, below 5% at 662 keV [48]. Scintillation response is in both cases troubled by slow components due to electron re-trapping at shallow traps in LuAG host [49] (Fig.…”

Fundamental study of inorganic–organic hybrid scintillator using Pr:Lu3Al5O12 and plastic scintillator

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Table I shows a comparison of Pr:LuAG and popular cerium-activated scintillators such as Ce:Lu 2 SiO 5 (Ce:LSO), [19][20][21] [21][22][23][24] and Ce:LaBr 3 . [24][25][26][27] Owing to this excellent properties, Pr:LuAG scintillator is attracting attention for £-ray detectors for oil well logging and has potential applications in high-energy physics and medical field such as PET.…”