Upconversion luminescence properties of monodisperse spherical Y(2)O(2)S:Yb,Ho nanocrystals

作者：Luo Xixian^*; Cao Wanghe; Xing Mingming

来源：Journal of Materials Research, 2009, 24(5): 1756-1760.

DOI：10.1557/JMR.2009.0208

Monodisperse spherical Y(2)O(2)S:Yb,Ho nanocrystals with particle size about 50 nm were prepared by a modified homogeneous precipitation method combined with low-temperature sulfurization process. The Y(2)O(2)S:Yb,Ho nanocrystals exhibit an intense green emission assigned to the Ho(3 ) ions (5)F(4), (5)S(2) -> (4)I(15/2) transition under 980 nm infrared pump. The upconversion luminescence brightness of Y(2)O(2)S:Yb,Ho is 526 Cd/m(2) under 4.63 W/cm(2) pump density, indicating that the as-prepared Y(2)O(2)S:Yb,Ho nanocrystals can meet the requirement of in vivo imaging. The formation mechanism of monodisperse spherical oxysulfide nanoparticles is also discussed.

• 出版日期2009-5
• 单位大连海事大学