Abstract
After the discovery of a cross-luminescence (CL) in BaF 2 in 1982, a large number of CL scintillators were investigated. However, no CL scintillator superior to BaF 2 has been discovered, and the research of CL scintillators has subsided. Recent technological development in medical imaging and high-energy physics created a new demand for ultra-fast scintillators further supported by the development of UV-sensitive semiconductor photodetectors. As a consequence, renewed interest in CL scintillators appeared. To satisfy the requirements of fast timing applications high photo-detection efficiency, e. i. a good spectral match between the scintillator and photodetector must be achieved. Cesium-based ternary chlorides could provide a red-shift (∼1.5 eV) of CL towards the sensitive region of the photodetector (PMT or SiPM) while keeping light output and timing characteristics comparable to BaF 2 . • Two families of Cs-based cross-luminescence halide scintillators investigated . • All Cs containing samples exhibit cross-luminescence in the 250–300 nm region. • The best sample achieved CTR comparable to commercial BaF 2 . • Cs-based cross-luminescence halide scintillator could reach CTR ∼50 ps.
Published Version
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