Abstract
In vitro and in vivo bioimaging, Yb/Tm doped fluoride nanocrystals (NCs) as nanoprobes have attracted much attention due to their near infrared (NIR) upconversion (UC) emission at 800 nm under NIR 980 nm excitation. Our paper presents a simple and general method which can further improve the intensity of NIR 800 nm emission of Tm3+ through adding Ho3+ as the second sensitizer of Tm3+ in Yb/Tm doped NaYF4 nanorods. The intensity of the NIR 800 nm emission is demonstrated to increase by up to 3 times along with the adding of Ho3+. Experimental data illustrates that the sensitizations of Tm3+ by both Yb3+ and Ho 3+ provide a more efficient energy transfer (ET) route for intense 800 nm emission than that by Yb3+ alone.
Original language | English |
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Pages (from-to) | 7602-7607 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 20 |
Issue number | 7 |
DOIs | |
State | Published - 26 Mar 2012 |
Externally published | Yes |