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Investigation of the persistent luminescence energy migration using high-end thermoluminescence and electron microscopy methods

Grant number: 18/09403-4
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): September 06, 2018
Effective date (End): September 05, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Marcia Carvalho de Abreu Fantini
Grantee:Jose Miranda de Carvalho Junior
Supervisor: Philippe Smet
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Ghent University (UGent), Belgium  
Associated to the scholarship:17/05195-5 - Structure-property relations of inorganic luminescent materials obtained by microwave-assisted synthesis method, BP.PD


Persistent luminescence (PeL) materials are attracting strong scientific interest nowadays due to their ability of storage of luminous energy for considerable periods of time. This stored energy can be used in a variety of applications, from emergency lighting to medical diagnoses and imaging. However, the improvement of the PeL materials is based on the try and error basis, mostly changing the chemical composition and (co-)dopants. The mechanisms of PeL require further understanding, in order to improve the design of the materials yielding better energy storage and consequently high efficiencies. Energy storage in the PeL materials occurs in the lattice defects that act as charge carrier traps forming long-lived states that can be emptied only after absorption of available thermal (kT) or optical (h½) energy. Despite the fact that the mechanisms of PeL phenomenon are reasonably well developed from the spectroscopic point of view, the energy storage is still a missing part. The spatial distribution of the defects related to the activator ions is necessary to unveil the mechanisms of energy storage. This project aims to use high-end thermoluminescence (TL) methods allied with scanning electron transmission microscopy (STEM) to shed light on the energy migration processes in crystalline PeL material. The modeling of the phenomenon can lead to more sophisticated mechanisms and possibly more efficient materials.

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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 CARVALHO, JOSE MIRANDA; VAN DER HEGGEN, DAVID; MARTIN, LISA I. D. J.; SMET, PHILIPPE F.. Microwave-assisted synthesis followed by a reduction step: making persistent phosphors with a large storage capacity. DALTON TRANSACTIONS, v. 49, n. 14, p. 4518-4527, . (17/05195-5, 18/09403-4)

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