Journal
OPTICAL MATERIALS EXPRESS
Volume 4, Issue 2, Pages 396-402Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.4.000396
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Science, ICT & Future Planning [NRF-2013-R1A1A2009154]
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Eu-doped fluorosilicate apatites M2Y3[ SiO4](3)F (M = Sr, Ba) are prepared by solid state reaction. Unlike conventional Eu-doped materials, coexistence of Eu3+ and Eu2+ ions is found from the photoluminescence of Eu-doped apatites M2Y3[SiO4](3)F (M = Sr, Ba) which were prepared in reducing atmosphere. Eu2+ ions are converted from Eu3+ ions in the reduction process. It is suggested that Eu2+ ions occupy A(I) (4f) or A(II) (6h) crystallographic site in the apatite lattices. Intense emission lines due to Eu3+ are observed at 600-630 nm, while broad emission band due to Eu2+ is observed at 450-650 nm. These emissions combined with blue emission from LED are suitable to obtain white light, i.e., white LEDs for lighting and display. Different luminescence characteristics are obtained between Sr2Y3[SiO4](3)F:Eu and Ba2Y3[SiO4](3)F: Eu, which were prepared in reducing atmosphere. (C) 2014 Optical Society of America
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