VUV-UV photoluminescence, site occupancy and thermal stability of blue-emitting K2CaP2O7:Eu2+ UV-LED phosphor

Autor: Mouna Derbel, Geneviève Chadeyron, Aïcha Mbarek
Přispěvatelé: Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA)
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Science: Materials in Electronics
Journal of Materials Science: Materials in Electronics, 2021, 32 (16), pp.21021-21031. ⟨10.1007/s10854-021-06587-x⟩
ISSN: 1573-482X
0957-4522
Popis: International audience; Blue-emitting phosphors K2Ca1−xP2O7:xEu2+ (x = 0.005; 0.010; 0.015) were prepared by a solid-state reaction. The luminescence properties of the phosphors were systematically investigated. VUV photoluminescence spectra of K2Ca1−xP2O7:xEu2+ exhibit that three distinct bands peaking at 439, 478 and 535 nm can be attributed to the overlap of Eu(1), Eu(2) and Eu(3) emission bands, which are ascribed to the 4f–5d transition of Eu2+. The critical quenching concentration of Eu2+ in K2CaP2O7 phosphor is about 1 mol%, and the critical transfer distance was determined to be 32.23 Å. When the temperature turned up to 150 °C, the emission intensity of K2Ca0.99P2O7:0.01Eu2+ sample was 60% of the initial value at room temperature. The activation energy Ea was calculated to be 0.217 eV, which proved the good thermal stability of the phosphor. All the properties indicated that the K2CaP2O7:Eu2+ is promising blue-emitting phosphor for application in LED-based lighting or display systems.
Databáze: OpenAIRE
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