Ultrasmall monodisperse NaYF4:Yb3+/Tm3+ nanocrystals with enhanced near-infrared to near-infrared upconversion photoluminescence
By Guanying Chen, Tymish Y. Ohulchanskyy, R. Kumar, Hans Ågren, Paras N. Prasad. ACS Nano, 2010
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Photoluminescent NaYF4:Yb3+/Tm3+ nanocrystals are ideally suited for in vitro and in vivo photoluminescence (PL) bioimaging due to their virtue of near infrared to near infrared (NIR-to-NIR) upconversion (UC); they display PL with peak at ~800 nm if excited at ~980 nm. Here, we report the synthesis of monodisperse NaYF4:Yb3+/Tm3+ nanocrystals of ultrasmall size (7–10 nm) with high UC efficiency. The intensity of their NIR UC emission was demonstrated to increase by up to 43 times along with increase in relative content of Yb3+ ions from 20% to 100%, with a corresponding decrease in the Y3+ content from 80% to 0%. The achieved ultrasmall NaYbF4:2% Tm3+ nanocrystals manifest NIR PL emission, which is 3.6 times more intense than that from 25-30 nm sized NaYF4: 20% Yb3+/2% Tm3+ nanocrystals, previously synthesized and used for in vitro and in vivo bioimaging. An optimization of both size and UC PL efficiency of NIR-to-NIR nanocrystals provides us with highly efficient optical imaging probes for bioapplications.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/259211af500e78a966d7d1e20867d3aa10c7b9f1
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In Materials Chemistry
Citations in the corpus
- Nd(3+)-sensitized upconversion nanophosphors: efficient in vivo bioimaging probes with minimized heating effect. (2013, background): “8 The sensitizers absorb near-infrared (NIR) photons and then transfer the energy to the activators.(9,10)”