Scintillation properties of Mn-doped methylammonium lead chloride crystals
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Scintillation properties of Mn-doped methylammonium lead chloride crystals Naoki Kawano1,* , Masaki Akatsuka2, Hiromi Kimura2, Daisuke Nakauchi2, Takumi Kato2, and Takayuki Yanagida2 1 2
Graduate School of Engineering Science, Akita University, 1-1Tegata Gakuen-machi, Akita 010-8502, Japan Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
Received: 30 June 2020
ABSTRACT
Accepted: 11 September 2020
Organic–inorganic perovskite materials with a bulk structure MAPbX3 (MA: methylamine, X: halogen) have attracted much attention in various applications such as solar cells, photodiodes, and radiation detectors. Herein, we synthesized (CH3NH3)Pb1-xMnxCl3 (or Mn-doped MAPbCl3) crystals by inverse temperature crystallization method to develop scintillator materials and evaluated their photoluminescence (PL) and scintillation properties systematically. The Mndoped MAPbCl3 crystals showed a sharp emission peak at approximately 410–430 nm with short decay times on the order of nanoseconds and a broad peak at approximately 600 nm with a long decay time on the order of milliseconds in PL and scintillation. Furthermore, pulse height spectra of the Mndoped MAPbCl3 crystals with a shaping time of 1 ls were measured, and the obtained scintillation light yields were estimated to be 66 (x = 1), 82 (x = 5), and 67 (x = 10) photons/5.5 MeV-a. Moreover, afterglow levels of the Mn-doped MAPbCl3 crystals were found to be 161 (x = 1), 264 (x = 5) and 170 (x = 10) ppm, which were comparable to a previously reported afterglow level of Tldoped CsI.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Scintillators are a kind of luminescent materials that have a capability of emitting low-energy photons immediately after they are excited by ionizing radiation. They have been used in a wide range of applications such as nuclear imaging, security scanners, oil logging, and radiation monitoring [1–3]. The requirements of basic characteristics for scintillators
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https://doi.org/10.1007/s10854-020-04480-7
include a high detection efficiency, chemical stability, a high light yield, radiation hardness, a fast decay time, and luminescence wavelength suitable for photodetectors [3–5]. There are no scintillators which fulfill the requirements; thus, an appropriate scintillator must be selected for each application. In general, inorganic materials are often used because many inorganic materials have industrial advantages such
J Mater Sci: Mater Electron
as a high light yield, a high density, and high radiation hardness [4, 5]. Perovskite materials are one of the attractive inorganic materials for scintillator applications, and their scintillation characteristics have been well investigated so far. For example, Ce-doped YAlO3 is a commonly used inorganic perovskite scintillator. It shows efficient scintillation (21,000 photons/MeV) peaking at 370 nm with a decay time of app
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