Print Email Facebook Twitter Experimental and Theoretical Studies of the Site Occupancy and Luminescence of Ce3+in LiSr4(BO3)3for Potential X-ray Detecting Applications Title Experimental and Theoretical Studies of the Site Occupancy and Luminescence of Ce3+in LiSr4(BO3)3for Potential X-ray Detecting Applications Author Yang, Yunlin (Sun Yat-sen University) Lou, Bibo (University of Science and Technology of China) Ou, Yiyi (Sun Yat-sen University) Su, Fang (Sun Yat-sen University) Ma, Chong Geng (Chongqing University of Posts and Telecommunications) Duan, Chang Kui (University of Science and Technology of China) Dorenbos, P. (TU Delft RST/Luminescence Materials) Liang, Hongbin (Sun Yat-sen University) Date 2022 Abstract Ce3+-doped LiSr4(BO3)3 phosphors have been prepared by a high-temperature solid-state reaction method, and structural refinement of the host compound has been performed. The excitation and emission spectra in the vacuum ultraviolet-ultraviolet-visible range at cryogenic temperatures reveal that Ce3+ ions preferentially occupy eight-coordinated Sr2+ sites in LiSr4(BO3)3. Such experimental attribution is well corroborated by the calculated 4f-5d transition energies and defect formation energies of Ce3+ ions at two distinct Sr2+ sites in the first-principles framework. In addition, the doping concentration-dependent luminescence and the temperature-dependent luminescence are systematically investigated by luminescence intensity and lifetime measurements, respectively. This shows that concentration quenching does not occur in the investigated doping range, but inhomogeneous broadening exists in the concentrated samples. With the estimated thermal quenching activation energy, the discussions on the thermal quenching mechanisms suggest that the thermal-ionization process of the 5d electron is a dominant channel for thermal quenching of Ce3+ luminescence, despite the fact that thermally activated concentration quenching cannot be excluded for the highly doped samples. Finally, the X-ray excited luminescence measurement demonstrates the promising applications of the phosphors in X-ray detection. To reference this document use: http://resolver.tudelft.nl/uuid:04921136-2bd0-4889-82f1-6c04d891f049 DOI https://doi.org/10.1021/acs.inorgchem.2c01016 Embargo date 2022-11-05 ISSN 0020-1669 Source Inorganic Chemistry, 61 (19), 7654-7662 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Yunlin Yang, Bibo Lou, Yiyi Ou, Fang Su, Chong Geng Ma, Chang Kui Duan, P. Dorenbos, Hongbin Liang Files PDF acs.inorgchem.2c01016.pdf 2.28 MB Close viewer /islandora/object/uuid:04921136-2bd0-4889-82f1-6c04d891f049/datastream/OBJ/view