【摘要】 采用泡生法生长了115 kg级大尺寸钛宝石（Ti∶Al₂O₃）晶体,晶体外形完整无开裂,制备了口径达?300 mm的高质量大口径钛宝石单晶样品。在X射线和α粒子激发下测试了晶体的闪烁发光性能。结果表明,Ti∶Al₂O₃晶体的闪烁发光包含近红外和近紫外发光。近红外发光来源于Ti³⁺特征发射,效率较高,衰减时间慢。近紫外发光来源于Ti局域激子发光和F⁺心发光,具有较快的衰减时间,其光输出与掺杂导致的自吸收有关。α粒子激发下,光产额达到1 130.5 pe/MeV,其中快成分光产额为29.6 pe/MeV。更多还原

【Abstract】 Large-sized Ti∶Al₂O₃ crystals with the weight of 115 kg were grown successfully by Kyropoulos method. The grown crystals have complete shape without any cracking. Large Ti∶Al₂O₃ single crystal sample with diameter of 300 mm was prepared. The scintillation luminescence properties of the grown crystals were tested under the X-ray and α particle excitation. The results show that the scintillation luminescence of Ti∶Al₂O₃ crystals include near infrared band and near ultraviolet band. The near infrared emission comes from the characteristic emission of Ti³⁺, which has high efficiency and slow decay time. The near ultraviolet emission comes from Ti-localized exciton emission and F⁺center, which has the fast decay time. The light output is related to the self-absorption caused by Ti-doping. Under the excitation of the α particles, the light yield reaches up to 1 130.5 pe/MeV, and the fast component is 29.6 pe/MeV.更多还原