Coordination environments of rare-earth ions in photonic glasses analyzed by pulsed electron paramagnetic resonance techniques

• Grant number: 15/04063-2
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Effective date (Start): June 01, 2015
• Effective date (End): September 14, 2015
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Hellmut Eckert
• Grantee: Marcos de Oliveira Junior
• Supervisor: Gunnar Jeschke
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Research place: Swiss Federal Institute of Technology Zurich, Switzerland
• Associated to the scholarship: 13/23490-3 - Magnetic Resonance Techniques for the Study of Structure/Property Correlations in Photonic Glassy and Glass Ceramic Materials, BP.PD

Abstract

Rare-earth ion (RE) doped glasses and glass-ceramics are viewed as the new generation of luminescent photonic materials. Besides having superior thermal and mechanical properties than single crystals, these materials can incorporate higher concentrations of doping ions and be fabricated at lower cost, in a larger variety of sizes and shapes. To optimize the luminescent properties of these materials, detailed structural information regarding the local environment of the rare-earth species is essential. Solid state nuclear magnetic resonance (NMR) is in general a promising tool for such purposes; unfortunately, the rare-earth ions themselves cannot be studied by NMR due to their paramagnetism. To overcome this difficulty, we propose to analyze the magnetic dipolar interactions of the unpaired electrons with nearby nuclear spins, using electron spin echo envelope modulation (ESEEM) and electron nuclear double resonance (ENDOR) spectroscopes. In conjunction with nuclear magnetic resonance (NMR) results that have already been obtained, these experiments will help to elucidate structural aspects of RE doped glasses, such as the RE ion local environments, the connectivity of the RE ion species with the network former species and the overall spatial distribution of the rare-earth dopants. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE OLIVEIRA, JR., MARCOS; KNITSCH, ROBERT; SAJID, MUHAMMAD; STUTE, ANNIKA; ELMER, LISA-MARIA; KEHR, GERALD; ERKER, GERHARD; MAGON, CLAUDIO J.; JESCHKE, GUNNAR; ECKERT, HELLMUT. Aminoxyl Radicals of B/P Frustrated Lewis Pairs: Refinement of the Spin-Hamiltonian Parameters by Field- and Temperature-Dependent Pulsed EPR Spectroscopy. PLoS One, v. 11, n. 6, JUN 23 2016. (13/23490-3, 13/07793-6, 15/04063-2)

DE OLIVEIRA, JR., MARCOS; GONCALVES, TASSIA S.; FERRARI, CYNTHIA; MAGON, CLAUDIO JOSE; PIZANI, PAULO S.; DE CAMARGO, ANDREA S. S.; ECKERT, HELLMUT. Structure-Property Relations in Fluorophosphate Glasses: An Integrated Spectroscopic Strategy. Journal of Physical Chemistry C, v. 121, n. 5, p. 2968-2986, FEB 9 2017. (13/23490-3, 13/07793-6, 15/04063-2)

ZHANG, RUILI; DE OLIVEIRA, MARCOS; WANG, ZAIYANG; FERNANDES, ROGER GOMES; DE CAMARGO, ANDREA S. S.; REN, JINJUN; ZHANG, LONG; ECKERT, HELLMUT. Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies. Journal of Physical Chemistry C, v. 121, n. 1, p. 741-752, JAN 12 2017. (13/07793-6, 13/23490-3, 15/04063-2)