Journal
OPTICAL MATERIALS
Volume 35, Issue 12, Pages 2618-2623Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2013.07.032
Keywords
Sol gel growth; Optical properties; Core-shell structure; White light-emitting diodes
Categories
Funding
- National Science Foundation of China [51072191, 11179037, J1030412]
- National Basic Research Program of China (973 Program) [2012CB922004]
- USTC-NSRL association funding [KY2060140005]
- Anhui Provincial Natural Science Foundation [11040606M11]
- Anhui Provincial Education Department [KJ2012A289]
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The uniform hollow spherical Sr2SiO4:Eu2+ green emitting phosphors have been successfully synthesized using hollow silica spheres as templates by an h-BN protective method. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results directly confirmed the existence of the hollow spherical structure with a narrow size distribution and a shell thickness of 15-25 nm. The h-BN protective film, observed by high resolution TEM, plays an important role in the formation of the hollow spherical morphology and the improvement of photoluminescence properties. Comparing with the Sr2SiO4:Eu2+ micron-phosphor prepared by the traditional solid state reaction method, the hollow spherical phosphor with nano-sized grains exhibits stronger green emission under ultraviolet-blue light excitation. This could be attributed to the elimination of surface defects by the h-BN coating. This research gives an economic and convenient way to synthesize uniform spherical phosphors with high quantum efficiency. (C) 2013 Elsevier B.V. All rights reserved.
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