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Open AccessArticle

A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications

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Materials Science and Engineering Program, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
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Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
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Center for Nanoscience and Nanotechnology, 22860 Ensenada, Mexico
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Department of Chemical Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
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Author to whom correspondence should be addressed.
Ceramics 2018, 1(1), 38-53; https://doi.org/10.3390/ceramics1010005
Received: 17 May 2018 / Revised: 2 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
This work successfully verified that the addition of a flux (NH4F, NH4Cl, and H3BO3) during synthesis has an impact on the crystallite size and quantum efficiency of submicron-sized particles of CaMgSi2O6:Eu2+ phosphors. The addition of NH4F or NH4Cl increased the crystallite size in the submicron-sized particles, yielding an increase in emission intensity and quantum efficiency. On the other hand, the use of the H3BO3 flux crystallized a secondary phase, SiO2, and changed the lattice parameters, which degraded the luminescent properties. In addition, an excessive amount of NH4Cl was examined, resulting in nucleation of a secondary phase, CaSiO3, which changed the lattice parameters with no improvement in luminescent properties. These results demonstrate that the addition of a flux could be a method to improve the quantum efficiency of submicron-sized particles composed of nanocrystallites; however, a judicious choice of the flux composition and amount has to be carefully considered. View Full-Text
Keywords: phosphors; Eu2+ activation; flux; quantum efficiency; crystallite size phosphors; Eu2+ activation; flux; quantum efficiency; crystallite size
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Ha, J.; Novitskaya, E.; Hirata, G.A.; Zhou, C.; Ridley, R.E.; Graeve, O.A.; McKittrick, J. A Facile Method Using a Flux to Improve Quantum Efficiency of Submicron Particle Sized Phosphors for Solid-State Lighting Applications. Ceramics 2018, 1, 38-53.

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