Change search
ReferencesLink to record
Permanent link

Direct link
Ultrasmall Monodisperse NaYF4:Yb3+/Tm3+ Nanocrystals with Enhanced Near-Infrared to Near-Infrared Upconversion Photoluminescence
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0002-1763-9383
Show others and affiliations
2010 (English)In: ACS NANO, ISSN 1936-0851, Vol. 4, no 6, 3163-3168 p.Article in journal (Refereed) Published
Abstract [en]

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 a peak at similar to 800 nm if excited at similar to 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 an increase in the 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.

Place, publisher, year, edition, pages
2010. Vol. 4, no 6, 3163-3168 p.
Keyword [en]
near-infrared, upconversion photoluminescence, nanocrystals, rare-earth ions
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-27312DOI: 10.1021/nn100457jISI: 000278888600026ScopusID: 2-s2.0-77955860620OAI: diva2:376037
QC 20101209Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2010-12-09Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Ågren, Hans
By organisation
Theoretical Chemistry
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 75 hits
ReferencesLink to record
Permanent link

Direct link