Isolated europium-doped metal-oxide nanoparticles were probed by size-correlated high-numerical-aperture (far-field) imaging techniques. A modified Digital Instruments Bioscope atomic force microscope mounted upon a Nikon TE300 inverted microscope was used to interrogate (dry) particles ranging in size from 2 to 150 nm on the surface of a glass or quartz coverslip. These experiments revealed several interesting features of doped-nanoparticle luminescence such as Poissonian occupation statistics, size-dependent luminescence efficiency enhancement for particle sizes of <10 nm, and correlation of interesting transient behavior at particle sizes of <5 nm.
© 2003 Optical Society of America
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(180.2520) Microscopy : Fluorescence microscopy
(180.5810) Microscopy : Scanning microscopy
Adosh Mehta, Thomas Thundat, Michael D. Barnes, Vishal Chhabra, Ramesh Bhargava, Andrew P. Bartko, and Robert M. Dickson, "Size-Correlated Spectroscopy and Imaging of Rare-Earth-Doped Nanocrystals," Appl. Opt. 42, 2132-2139 (2003)