Optical and scintillation properties of bulk ZnO crystal

Abstract

Single crystal bulk ZnO scintillator grown by the hydrothermal method was tested on its scintillation performances. In X‐ray induced radio luminescence spectrum, it exhibited two intense emission peaks at 400 and 550 nm. The former was ascribed to the free and bound exciton related luminescence and the latter to oxygen vacancy related one, respectively. X‐ray induced scintillation decay time of the exciton related emission measured by the pulse X‐ray streak camera system resulted ∼ 4 ns. Finally, the light yield under 241Am 5.5 MeV α‐ray was examined and it resulted ∼ 500 ph/5.5 MeV‐α.(© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Comparative Study of Optical and Scintillation Responses of Sr3NbGa3Si2O14 (SNGS) and La3Ta0.5Ga5.3Al0.2O14 (LTGA) Crystals

“…(2) The decay time of SNGS was similar to that of the defect emission of ZnO. (11) In our previous studies, we examined the PL decay of some langasite materials, and only LTGA exhibited a detectable signal; thus SNGS was a relatively bright material compared with other langasite crystals.…”

“…(4) Scintillation detectors, usually consisting of scintillator materials and photodetectors, have played a major role in ionizing radiation detectors for use in medical, (5) security, (6) well-logging, (7) astrophysics, (8) and particle physics applications. (9) Although most commercial scintillators are Ce 3+ -doped, (10) since Ce 3+ 5d-4f transition is parity-and spinallowed, nondoped materials (e.g., ZnO (11) ) have also attracted much attention in terms of reducing the cost of rare earths that are generally doped into scintillators as emission centers. Generally, nondoped materials exhibit scintillation due to some defects or excitons.…”

Evaluation of Scintillation Properties of GaN

“…One of good examples is ZnO. In ZnO, sub-nano seconds fast scintillation decay time due to a free exciton and medium level of scintillation light yield were observed [7]. Thus, similar scintillation properties can be expected in GaN.…”

Study of vacuum ultraviolet scintillation in rare earth doped Lutetium fluoride

“…In order to evaluate scintillation decay time, pulse X-ray streak camera system was used [21][22]. Scintillation light yield was evaluated by our standard setup [23][24][25][26][27]. The used PMT was a VUV sensitive type, R8778 (Hamamatsu).…”