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Optical Evaluation of Divalent and Trivalent Eu Ions Doped in CaF 2 Crystals Using Multiphoton Luminescence 3D Distribution Measurements
Author(s) -
Ito Hiroaki,
Tanaka Miho,
Ono Shingo,
Yamaji Akihiro,
Kurosawa Shunsuke,
Yoshikawa Akira
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900477
Subject(s) - ionic radius , divalent , luminescence , ion , doping , analytical chemistry (journal) , crystal structure , materials science , europium , scintillator , crystal (programming language) , ionic bonding , activator (genetics) , crystallography , chemistry , optics , optoelectronics , physics , programming language , biochemistry , organic chemistry , chromatography , detector , computer science , metallurgy , gene
Eu‐doped CaF 2 is studied for use as a scintillator. Herein, the 3D spatial distribution of Eu ions doped in CaF 2 crystal is evaluated. It is confirmed that both divalent and trivalent Eu ions are doped in CaF 2 crystals from the luminescence spectra of the Eu‐doped CaF 2 crystals. Using bandpass filter, the 3D spatial distribution of divalent and trivalent Eu ions is measured, respectively. The 3D spatial distribution of divalent Eu ions with ionic radius larger than that of Ca site is nonuniform with mesh‐like pattern. In contrast, the 3D spatial distribution of trivalent Eu ions with ionic radius smaller than that of Ca site is uniform. In Eu‐doped CaF 2 crystals grown by micropulling down method, strain caused by the difference in lattice constants between CaF 2 and a seed crystal is confirmed.