Answers are grounded in this paper and cite their sources.
Nanocrystal up-conversion phosphors (UCP), ytterbium- and erbium-codoped lanthanum molybdate (La 2 (MoO 4 ) 3:Yb,Er), were prepared for the first time for potential uses in bioassays especially in biochip-based analysis. The La 2 (MoO 4 ) 3:Yb,Er nanocrystals, with an average diameter of 50 nm, were prepared via a hydrothermal method. After being annealed at 800 °C for 5 h, strong emission of these nanocrystals was observed when excited with a 980 nm infrared (IR) laser. Fluorescent intensity of these nanocrystals is much stronger than that of bulk materials. Down-conversion spectrum of the nanocrystal phosphors was also examined. Two-photon excitation mechanism was proposed for the up-conversion process. Factors affecting the up-conversion fluorescent intensity were also studied. The particle-size-dependent phenomenon was first observed for nanocrystal UCP, and the mechanism was discussed.
No takes yet. Share an insight, caveat, or question.
Yi et al. (2002) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: