MERIZIO, L.G.BONTURIM, E.ICHIKAWA, R.U.SILVA, I.G.N.TEIXEIRA, V.C.RODRIGUES, L.C.V.BRITO, H.F.2022-01-262022-01-262021MERIZIO, L.G.; BONTURIM, E.; ICHIKAWA, R.U.; SILVA, I.G.N.; TEIXEIRA, V.C.; RODRIGUES, L.C.V.; BRITO, H.F. Toward an energy-efficient synthesis method to improve persistent luminescence of Sr2MgSi2O7:Eu2+,Dy3+ materials. <b>Materialia</b>, v. 20, p. 1-10, 2021. DOI: <a href="https://dx.doi.org/10.1016/j.mtla.2021.101226">10.1016/j.mtla.2021.101226</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/32655.2589-1529http://repositorio.ipen.br/handle/123456789/32655The synthesis of persistent luminescent materials usually requires a multi-step long time annealing at high temperatures (>1200°C) in a resistive oven, causing a huge energy consumption. Also, to achieve reduced oxidation states of emitter ions (e.g., Eu3+ → Eu2+ ), the H2(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.1-10openAccessmicrowave radiationsynthesisrare earthssolidsluminescenceannealingsynchrotron radiationArtigo de periódico2010.1016/j.mtla.2021.101226Sem Percentil64.00