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Upconversion luminescence properties of monodisperse spherical Y2O2S:Yb,Ho nanocrystals

Published online by Cambridge University Press:  31 January 2011

Xixian Luo ,
Wanghe Cao  and
Mingming Xing
Xixian Luo*
Affiliation:
Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, People's Republic of China
Mingming Xing
Affiliation:
Physics Department, Dalian Maritime University, Dalian, Liaoning 116026, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Monodisperse spherical Y2O2S:Yb,Ho nanocrystals with particle size about 50 nm were prepared by a modified homogeneous precipitation method combined with low-temperature sulfurization process. The Y2O2S:Yb,Ho nanocrystals exhibit an intense green emission assigned to the Ho3+ ions 5F4, 5S2 → 4I15/2 transition under 980 nm infrared pump. The upconversion luminescence brightness of Y2O2S:Yb,Ho is 526 Cd/m2 under 4.63 W/cm2 pump density, indicating that the as-prepared Y2O2S:Yb,Ho nanocrystals can meet the requirement of in vivo imaging. The formation mechanism of monodisperse spherical oxysulfide nanoparticles is also discussed.

Keywords

Grain sizeLuminescence
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 5 , May 2009 , pp. 1756 - 1760
Copyright
Copyright © Materials Research Society 2009

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