Observation of a magic discrete family of ultrabright Si nanoparticles

Belomoin, G.; Therrien, J.; Smith, A.; Rao, S.; Twesten, R.; Chaieb, S.; Nayfeh, M. H.; Wagner, L.; Mitas, L.
February 2002
Applied Physics Letters;2/4/2002, Vol. 80 Issue 5, p841
Academic Journal
We demonstrate that electrochemically etched, hydrogen capped Si[sub n]H[sub x] clusters with n larger than 20 are obtained within a family of discrete sizes. These sizes are 1.0 (Si[sub 29]), 1.67 (Si[sub 123]), 2.15, 2.9, and 3.7 nm in diameter. We characterize the particles via direct electron imaging, excitation and emission optical spectroscopy, and colloidal crystallization. The band gaps and emission bands are measured. The smallest four are ultrabright blue, green, yellow and red luminescent particles. The availability of discrete sizes and distinct emission in the red, green and blue (RGB) range is useful for biomedical tagging, RGB displays, and flash memories. © 2002 American Institute of Physics.


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