Journal
OPTICAL MATERIALS
Volume 37, Issue -, Pages 410-413Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2014.06.036
Keywords
Silicates; Luminescence; Red phosphor; Eu3+; K4BaSi3O9
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Funding
- project New efficient phosphors for lighting and solar concentrators co-funded by European Regional Development Fund within the Innovative Economy Program [POIG.01.01.02-02-006/09]
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K4BaSi3O9:Eu3+ polycrystals were synthesized by solid state method. X-ray powder diffraction measurements confirmed structure of the samples. The excitation and the emission spectra of orthorhombic K4BaSi3O9 doped with Eu3+ were investigated. The excitation spectrum exhibits a broad band with maximum at 220 nm corresponding to the charge transfer (CT) transition between O2- and Eu3+ ions and smaller 4f-4f transitions. The emission of investigated phosphor was excited at 395 nm and has quantum efficiency (QE) equal 27%. The emission maximum at 616.5 nm was assigned to the D-5(0) -> F-7(2) transition of Eu3+ ions. The luminescence decay profiles as well as the thermal quenching were measured and analyzed. K4BaSi3O9:Eu(3+)has high temperature quenching of the emission T-0.5 = 335 degrees C. (C) 2014 Elsevier B.V. All rights reserved.
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