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Open Access Luminescence properties and energy transfer in K2MgSiO4:Ce3 +, Tb3 + as a green phosphor

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Series new green K2MgSiO4:Ce3+, Tb3+ phosphors were synthesized by solid-state reaction method. The crystal structure, luminescence and reflectance spectra, energy transfer mechanism and temperature dependent performance have been investigated respectively. The information of crystal structure was detected by X-ray diffraction, and the optimized doping concentration of Ce3+ ions and Tb3+ ions were confirmed to 4% mol and 2% mol, respectively. The energy transfer mechanism has been validated to be a resonant type via a dipole–dipole interaction with high efficiency of 55.1%. The energy transfer critical distance of this phosphor was calculated by the concentration quenching method (14.08 Å) and spectral-overlap method (15.68 Å). This phosphor shows good thermal stability which maintains high intensity with 80.94% and 67.75% at 100 °C and 150 °C compared with the initial intensity (25 °C).

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Document Type: Research Article

Publication date: February 1, 2016

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