Luminescent properties of Cr-doped (Gd-X, Y1-X)(3)Al5O12 infra-red scintillator crystals

作者：Suzuki Akira^*; Kurosawa Shunsuke; Yamaji Akihiro; Shoji Yasuhiro; Pejchal Jan; Kamada Kei; Yokota Yuui; Yoshikawa Akira

来源：Optical Materials, 2014, 36(12): 1938-1941.

DOI：10.1016/j.optmat.2014.04.002

• Infra-red scintillator
• Patient dosimetry
• Cr-doped oxide garnet
• Bulk crystal

Cr-doped (Gd-X Y1-X)(3)Al5O12 (X= 0, 0.25, 0.50) crystals prepared by the micro-pulling down method were investigated to develop a infra-red scintillator for implantable patient dosimeter in radiation therapy. In order to evaluate-their optical and scintillation performance, the following properties were measured: (i) transmittance between ultra-violet and near-infra red region, (ii) photoluminescence spectra under Xe-lamp excitation, and (iii) X-ray excited radio-luminescence spectra. CrY3Al5O12 and Cr:(Gd-0.25 Y-0.75)(3)Al5O12 crystals showed increased transmittance of 80%, while Cr:(Gd-0.50 Y-0.50)(3)Al5O12 had a lower transmittance of 40% due to its polycrystalline structure. In addition, all the Cr:(Gd-X Y1-X)(3)Al5O12 crystals showed sharp scintillation luminescence peaks ascribed to Cr3+ d-d transitions. Therefore, these results suggested that CrY3Al5O12 and Cr:(Gd-0.25 Y-0.75)(3)Al5O12 crystals can be candidate materials for the dosimeter use.

• 出版日期2014-10