零维钙钛矿结构Cs3Cu2Br5单晶的生长和X射线探测性能

金属卤化物低维钙钛矿具有高效的发光性能,并且作为闪烁体在辐射探测领域表现出极大的潜力。本文采用布里奇曼坩埚下降法生长出全无机零维钙钛矿结构Cs₃Cu₂Br₅单晶。研究了Cs₃Cu₂Br₅的光学吸收、光致激发和发射,时间分辨光致发光和以及X射线探测性能。Cs₃Cu₂Br₅晶体结构为正交晶系,空间群为Pnma。在X射线激发下,Cs₃Cu₂Br₅晶体具有峰值约为467 nm的宽带发射,该发射来自自陷激子发射。Cs₃Cu₂Br₅的稳态光产额约为4 000 ph./MeV,且X射线余辉性能表现与BGO晶体相当。

Crystal Growth and X-Ray Detection Performance of 0D Cs3Cu2Br5 Single Crystal Perovskite

Metal halides low-dimensional perovskites have highly efficient luminescent properties and shown great potential as scintillators for radiation detection applications. Herein,single crystal of all-inorganic zero-dimensional Cs₃Cu₂Br₅ was grown by the Bridgman technique. The optical absorption, photoluminescence emission and excitation, time-resolved photoluminescence, and X-ray detection performance of Cs₃Cu₂Br₅ were measured. The Cs₃Cu₂Br₅ crystallized into orthorhombic system with a space group of Pnma. Under the excitation of X-ray, Cs₃Cu₂Br₅ crystal has a broad emission peaking at about 467 nm originated from self-trapped exciton emission. The steady state light yield of Cs₃Cu₂Br₅ is about 4 000 ph./MeV and its afterglow performance is comparable to that of BGO crystal.