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Title: Effects of size and surface on luminescence properties of submicron upconversion NaYF4:Yb, Er particles
Authors: Yuan, D. 
Yi, G.S. 
Chow, G.M.
Issue Date: Jun-2009
Source: Yuan, D., Yi, G.S., Chow, G.M. (2009-06). Effects of size and surface on luminescence properties of submicron upconversion NaYF4:Yb, Er particles. Journal of Materials Research 24 (6) : 2042-2050. ScholarBank@NUS Repository.
Abstract: Bulk NaYF4:Yb, Er particles (∼1.4 μm particle size) were synthesized using a hydro-thermal method. As-synthesized particles were subsequently ball milled to three average particle sizes, namely, ∼260 nm, 160 nm, and 100 nm. The x-ray diffraction pattern showed an hcp phase for as-synthesized and ball-milled particles with a predominant (100) peak. Room temperature emission spectra showed no size dependent peak shifts or peak broadening. The intensities of both green and red emissions decreased with increasing milling time. Segregation of Er ions was detected on the surfaces of milled particle that reduced the sensitizer-activator transition probability, resulting in decreased emission intensities. The green-to-red emission ratio was correlated to the surface enrichment of Er, which affected the cross-relaxation of luminescence dynamics. © 2009 Materials Research Society.
Source Title: Journal of Materials Research
ISSN: 08842914
DOI: 10.1557/jmr.2009.0258
Appears in Collections:Staff Publications

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