@article{b46d9985fb4b4625a15504c39fefab9b,
title = "On the luminescence origin in Y2SiO5:Ce and Lu2SiO5:Ce single crystals",
abstract = "Photoluminescence characteristics of single crystals of Ce3+-doped rare-earth oxyorthosilicates RE2SiO5 (RE: Y, Lu) with different Ce3+ concentrations are studied in the 4.2–500 K temperature range by the steady-state and time-resolved spectroscopy methods. The concentrations of single and dimer Ce3+-related centers of different types in the investigated crystals are evaluated from their EPR spectra. On the basis of the obtained results and analysis of literature data, the origin of the Ce3+-related centers responsible for the luminescence of these crystals is clarified and a new interpretation of their luminescence spectra is proposed. The suggestion is made that the dominating higher-energy (violet) doublet emission band of Y2SiO5:Ce and Lu2SiO5:Ce (denoted earlier as the Ce1 emission) arises from the Ce3+ ions substituting for the host crystal lattice rare-earth RE3+ ions in both RE1 and RE2 lattice sites and, thus, can be considered as the superposition of the strong Ce1 and weak Ce2 emission bands. The weaker lower-energy (blue) broad emission band (denoted earlier as the Ce2 emission) is ascribed to the dimer {Ce3+ - Ce3+} centers. No centers with the local X1 structure, containing Ce3+ ions and neighboring O2− ions (the CeO9 clusters embedded into the crystal lattice of the X2 structure), reveal themselves in the EPR spectra.",
keywords = "EPR, Oxyorthosilicates, Photoluminescence, Single and dimer Ce centers",
author = "V. Babin and Laguta, {V. V.} and M. Nikl and J. Pejchal and A. Yoshikawa and S. Zazubovich",
note = "Funding Information: The work was supported by the ERDF funding in Estonia granted to the Center of Excellence TK141 “ Advanced materials and high-technology devices for sustainable energetics, sensorics and nanoelectronics “ (project No. 2014-2020.4.01.15-0011 ), the project 20-12885S of the Czech Science Foundation , the CSA- EAS project ETA-18-01 “ Development of Nanophosphors and Thin Films for Optical Gas Sensing ”, and the GIMRT Program of the Institute for Materials Research , Tohoku University (Proposal No. 19K0514 ). Partial support of the project from the Ministry of Education, Youth and Sports of Czech Republic no. CZ.02.1.01/0.0/0.0/16_013/0001406 is also gratefully acknowledged. Funding Information: The work was supported by the ERDF funding in Estonia granted to the Center of Excellence TK141 “Advanced materials and high-technology devices for sustainable energetics, sensorics and nanoelectronics“ (project No. 2014-2020.4.01.15-0011), the project 20-12885S of the Czech Science Foundation, the CSA-EAS project ETA-18-01 “Development of Nanophosphors and Thin Films for Optical Gas Sensing”, and the GIMRT Program of the Institute for Materials Research, Tohoku University (Proposal No. 19K0514). Partial support of the project from the Ministry of Education, Youth and Sports of Czech Republic no. CZ.02.1.01/0.0/0.0/16_013/0001406 is also gratefully acknowledged. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",
year = "2020",
month = may,
doi = "10.1016/j.optmat.2020.109832",
language = "English",
volume = "103",
journal = "Optical Materials",
issn = "0925-3467",
publisher = "Elsevier",
}