Abstract
The present study was carried out by means of the low temperature time-resolved luminescence UV–VUV spectroscopy as well as the optical and thermally activation spectroscopy. The Ce3+ centers in regular lattice sites and located in the vicinity of the point defects of crystal structure were observed. Spectral and kinetic characteristics of the luminescence of these centers were defined. A photoluminescence of new point defects of the crystal structure are also manifested. We evaluated the energy of the interband transitions as Eg ≈ 6.2 eV in LaBr3. At the excitation energies Eexc>13 eV (higher than 2Eg) the effect of the electronic excitations multiplication was detected.
Highlights
The LaBr3:Ce scintillator manufactured by the company Saint–Gobain, is very attractive for both spectrometric applications and for medical imaging
Photoluminescence (PL) studies of d→f emission in Сe3+ ions and self–trapped excitons (STE) under excitation by photons in ultraviolet (UV) and vacuum ultraviolet (VUV) ranges in LaBr3:Ce was reported in Ref. [1, 2] only
In the later works the results presented in Ref. [1, 2] are quoted, further similar investigations of LaBr3 in VUV range were not carried out and this result seems to be ambiguous
Summary
The LaBr3:Ce scintillator manufactured by the company Saint–Gobain, is very attractive for both spectrometric applications and for medical imaging. [1, 2] are quoted, further similar investigations of LaBr3 in VUV range were not carried out and this result seems to be ambiguous. Our first results of LaBr3:Ce PL investigations under VUV excitation are presented in Ref. LaBr3:Ce crystals are hygroscopic, the method of growth of LaBr3:Ce single crystals doped with hafnium was developed in Russia [6]. These LaBr3:Ce,Hf crystals have low hygroscopicity and they are more suitable for practical applications. The main goal of present work is the studies of luminescence of the LaBr3:Ce,Hf crystals produced in Russia. The present study was carried out by means of the time-resolved luminescence UV-VUV spectroscopy as well as the optical absorption spectroscopy
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