Abstract
Composition-property correlations have been systematically studied in the full concentration range of Y3Al5−xGaxO12:Ce (YAGG:Ce) scintillator crystals. The most promising compositions for new high energy physics experiments at colliders have been determined with the light output >200% relative to BGO and fast luminescence decay. Codoping with Ca2+ provides the decrease of phosphorescence intensity to 0.2% after 0.6 μs and shortening of the luminescence decay constant to 21 ns. Factors affecting the scintillation decay time in YAGG:Ce have been discussed. The crystals show weak transmission loss under γ-irradiation. The feasibility to produce YAGG:Ce fibers using the μ-PD method has been shown.
Highlights
Crystals of rare-earth garnets formed by substitution of rare-earth cations and/or Al3+/Ga3+ substitutions are considered to be promising scintillation materials for a number of applications
In this work we present an another approach to decrease a scintillation decay time in garnets based on combination of the energy structure engineering in YAGG:Ce by Al/Ga substitution and divalent cation codoping
3.1 Growth of YAGG:Ce bulk crystals Y3(Al1-xGax)5O12:Ce (YAGG) crystals with the Ga content 75 and 85 %, and the [22,23,24,25] mm diameter and [50-100] mm length were grown on a YAG seed with [100] orientation by the Czochralski method using Ir crucibles with the 40 mm diameter and 30 mm height
Summary
Crystals of rare-earth garnets formed by substitution of rare-earth cations and/or Al3+/Ga3+ substitutions are considered to be promising scintillation materials for a number of applications. Developed Gd3Al5-xGaxO12:Ce (GAGG:Ce) scintillator shows the extremely high light yield up to 58000 phot/MeV among the studied to date oxide scintillators [1,2], and even higher values were reported for Ce-doped (Gd2Y1)Ga2.7Al2.3O12 crystals 3 This result is usually attributed to the so-called “bandgap engineering” in garnets, when Ce3+ activator emission levels can be positioned in the bandgap by control of the band gap and crystalline field strength at partial cation substitution in the host 4. In this work we present an another approach to decrease a scintillation decay time in garnets based on combination of the energy structure engineering in YAGG:Ce by Al/Ga substitution and divalent cation codoping.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
