X-ray scintillation in lead-free double perovskite crystals
- 139 Downloads
Metal halide perovskites have shown great performance for various applications, including solar cells, light emitting diodes, and radiation detectors, but they still suffer from the toxicity of lead and instability. Here we report the use of lanthanide series as trivalent metals to obtain low toxicity and highly stable double perovskites (Cs2NaLnCl6, Ln=Tb or Eu) with high scintillation light yield. The crystals exhibit typical f-f transitions of lanthanide cations, while Cs2NaTbCl6 exhibits strong green photoluminescence, and Cs2NaEuCl6 exhibits red photoluminescence. Under X-ray radiations, the light yield of Cs2NaTbCl6 reaches 46600 photons MeV−1, much higher than that of the commercially used (Lu,Y)2SiO5:Ce3+ crystals (LYSO, 28500 photons MeV−1), and previously reported lead-based perovskites (14000 photons MeV−1). As a new member of lead-free perovskites, lanthanide-based double perovskites open up a new route toward radiation detections and potential medical imaging.
Keywordslow toxic scintillation light yield lanthanide double perovskites
This work was supported by the Major State Basic Research Development Program of China (2016YFB0700702), the National Natural Science Foundation of China (5171101030, 51602114), the HUST Key Innovation Team for Interdisciplinary Promotion (2016JCTD111) and the Open Fund of State Key Laboratory of Luminescence and Applications (SKLA-2016-08). The authors thank the Analytical and Testing Center of HUST and the facility support of the Center for Nanoscale Characterization and Devices, WNLO.
- 14.Seferlis Ι. Investigatoin and imaging characteristics of a CMOS sensor based digital detector coupled to a red emitting fluorescent screen. Dissertation for the Master Degree. Patras: University of Patras 2013Google Scholar