Sr2MgSi2O7:Eu2+, Dy3+ long persistent luminescence material synthesized by microwave-assisted solid-state method (MASS)
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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Persistent luminescence materials can emit light for several hours after ceasing an
irradiation source. Studies involving these materials have increased in lasts years mainly due
to their singular properties 1. Dissilicates (Sr2MgSi2O7) present promising results, however the
ordinary processes require high annealing temperatures and time (~1200 °C, 5 h). A current
challenge is find alternatives synthesis methods that can reduce these elevated time and
temperatures required. Microwave-Assisted Solid-State synthesis (MASS) is an excellent
alternative that can achieve high temperatures in only a few minutes allowing synthesis times
around 25 minutes. In this work, Sr2MgSi2O7:Eu2+,Dy3+ was synthesized by MASS. The
SrCO3, (MgCO3)4(Mg(OH)2), SiO2, and R2O3, (R3+: Eu, Dy) precursors were grinded and
then annealed in a domestic microwave oven using carbon as susceptor at 1000 W for 10
minutes and 900 W for 15 minutes. The excitation spectrum (Fig.1 left red) shows a broad
band from 250 to 450 nm assigned to the Eu2+ 4f65d1 ← 4f7 transitions. Several Eu3+ 4f – 4f
absorption peaks are observed at e.g. 396, 420 and 450 nm. The emission spectra (Fig. 1, left
blue) shows a broad band centered at 470 nm arising from Eu2+ parity allowed 4f65d1 → 4f7
transition with no Eu3+ emission, which indicates energy transfer from Eu3+ to Eu2+. The CIE
chromaticity diagram (Fig. 1 right) shows a blue color (x: 0.105; y: 0.236). An important
characteristic of this material is the possibility to excite efficiently in the visible range (blue
region), allowing applications in the storage of sun light energy.
Como referenciar
MERIZIO, L.G.; BONTURIM, E.; SILVA, I.G.N.; RODRIGUES, L.C.V.; BRITO, H.F. Sr2MgSi2O7:Eu2+, Dy3+ long persistent luminescence material synthesized by microwave-assisted solid-state method (MASS). In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 1, 2017, João Pessoa, PB. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27989. Acesso em: 12 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.