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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Toward an energy-efficient synthesis method to improve persistent luminescence of Sr2MgSi2O7:Eu2+,Dy3+ materials

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Author(s):
Merizio, L. G. [1, 2] ; Bonturim, E. [3, 2] ; Ichikawa, R. U. [4] ; Silva, I. G. N. [5] ; Teixeira, V. C. [6] ; Rodrigues, L. C. V. [2] ; Brito, H. F. [2]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo IFSC USP, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo IQ USP, Inst Chem, Dept Fundamental Chem, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Prebiteriana Mackenzie, Sch Engn, Dept Chem, BR-01302907 Sao Paulo, SP - Brazil
[4] Nucl & Energy Res Inst IPEN, CNEN SP, BR-05508000 Sao Paulo, SP - Brazil
[5] Univ Sao Paulo IF USP, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil
[6] Brazilian Ctr Res Energy & Mat LNLS CNPEM, Brazilian Synchrotron Light Lab, BR-13084971 Campinas, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: MATERIALIA; v. 20, DEC 2021.
Web of Science Citations: 0
Abstract

The synthesis of persistent luminescent materials usually requires a multi-step long time annealing at high temperatures (> 1200 degrees C) in a resistive oven, causing a huge energy consumption. Also, to achieve reduced oxidation states of emitter ions (e.g., Eu3+ -> Eu2+), the H-2(g) atmosphere is often used, which can be dangerous and increase the costs of the process. Therefore, the development of a quick and new single-step green strategy, using in-situ low-risk atmosphere (e.g., CO(g)) and a microwave-assisted solid-state (MASS) method has been encouraged. In this work, we present a single-step method to synthesize the compound Sr2MgSi2O7:Eu2+,Dy3+ using the MASS method and the results were compared with those prepared by a conventional ceramic method. The luminescent material was prepared in 25 min of synthesis using carbon as a microwave susceptor and CO(g) atmosphere source at the same time. A higher concentration of Eu2+ emitter was identified by XANES in the MASS method product, which has a significant effect on the luminescence efficiency, as well as an improvement in the optical properties, leading to an emission 100 times more intense. Furthermore, to understand the Eu3+ reduction process under CO(g) atmosphere, we present here the innovative results of in-situ XANES analysis for the Sr2MgSi2O7:Eu2+,Dy3+ material. Finally, the MASS method makes it possible to prepare the materials with less than 5% of the ceramic method's duration in time. The energy-saving and better-quality persistent luminescent properties obtained in the MASS method provide viable applications on anti-counterfeiting markers, solar cell sensitizers, and other luminescent technologies. (AU)

FAPESP's process: 10/19278-0 - Study of regulation of ADAMs in oral cancer
Grantee:Adriana Franco Paes Leme
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 18/05280-5 - Red-Infrared active photonic materials for energy conversion and storage
Grantee:Lucas Carvalho Veloso Rodrigues
Support Opportunities: Regular Research Grants
FAPESP's process: 19/21770-5 - Luminescent materials incorporated to glasses: new composites for application in safety lighting and radiation detection
Grantee:Leonnam Gotardo Merizio
Support Opportunities: Scholarships in Brazil - Post-Doctoral