Next Article in Journal
On the Synthesis and Characterization of Lanthanide Metal-Organic Frameworks
Previous Article in Journal
Enhanced Mechanical Properties in ED-Machinable Zirconia-Tungsten Carbide Composites with Yttria-Neodymia Co-Stabilized Zirconia Matrix
Article Menu

Export Article

Open AccessArticle
Ceramics 2018, 1(1), 38-53; https://doi.org/10.3390/ceramics1010005

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

1
Materials Science and Engineering Program, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
2
Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
3
Center for Nanoscience and Nanotechnology, 22860 Ensenada, Mexico
4
Department of Chemical Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA
*
Author to whom correspondence should be addressed.
Received: 17 May 2018 / Revised: 2 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
Full-Text   |   PDF [2816 KB, uploaded 20 July 2018]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Ceramics EISSN 2571-6131 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top