Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26263
Title: Improved multiphoton ultraviolet upconversion photoluminescence in ultrasmall core-shell nanocrystals
Authors: Tao, L
Zhou, B
Jin, W 
Chai, Y 
Tang, CY
Tsang, YH 
Issue Date: 2014
Publisher: Optical Society of American (OSA)
Source: Optics letters, 2014, v. 39, no. 21, p. 6265-6268 How to cite?
Journal: Optics Letters 
Abstract: Near-infrared to ultraviolet multiphoton upconversion photoluminescence in ultrasmall Tm3+/Yb3+-codoped CaF2 nanocrystals (∼6.7 nm in size) was observed and further significantly enhanced by growing an active shell of NaYF4:Yb3+. Owing to the active shell, the lanthanide emitters inside the core are effectively prevented from the surface quenchers, and the excitation energy is absorbed more efficiently via the additional luminescence sensitizer Yb3+ embedded in the shell. The details of underlying physics were investigated and discussed. The results present a good ultrasmall luminescent material system for achieving efficient multiphoton upconversion, which shows great potential in versatile industrial and biological applications.
URI: http://hdl.handle.net/10397/26263
ISSN: 0146-9592
DOI: 10.1364/OL.39.006265
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