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@article{48277,
   author = {Nasrabadi, Hossein Beygi and Madirov, Eduard and Popescu, Radian and Štacková, Lenka and Štacko, Peter and Klán, Petr and Richards, Bryce S. and Hudry, Damien and Turshatov, Andrey},
   article_location = {CAMBRIDGE},
   article_number = {45},
   doi = {http://dx.doi.org/10.1039/d1tc03333f},
   keywords = {RESONANCE ENERGY-TRANSFER; CORE/SHELL NANOPARTICLES; HUGE ENHANCEMENT; SENSITIZATION},
   language = {eng},
   issn = {2050-7526},
   journal = {Journal of Materials Chemistry C},
   title = {Coordination mechanism of cyanine dyes on the surface of core@active shell β-NaGdF4:Yb3+,Er3+ nanocrystals and its role in enhancing upconversion luminescence},
   url = {https://pubs.rsc.org/en/content/articlelanding/2021/TC/D1TC03333F},
   volume = {9},
   year = {2021}
}

TY  - JOUR
ID  - 48277
AU  - Nasrabadi, Hossein Beygi - Madirov, Eduard - Popescu, Radian - Štacková, Lenka - Štacko, Peter - Klán, Petr - Richards, Bryce S. - Hudry, Damien - Turshatov, Andrey
PY  - 2021
TI  - Coordination mechanism of cyanine dyes on the surface of core@active shell β-NaGdF4:Yb3+,Er3+ nanocrystals and its role in enhancing upconversion luminescence
JF  - Journal of Materials Chemistry C
VL  - 9
IS  - 45
SP  - 16313-16323
EP  - 16313-16323
PB  - Royal Society of Chemistry
SN  - 2050-7526
KW  - RESONANCE ENERGY-TRANSFER
KW  - CORE/SHELL NANOPARTICLES
KW  - HUGE ENHANCEMENT
KW  - SENSITIZATION
UR  - https://pubs.rsc.org/en/content/articlelanding/2021/TC/D1TC03333F
N2  - The sensitization of lanthanide-doped upconversion nanocrystals (UCNCs) using organic dyes with a broad and intense optical absorption is an interesting approach for efficient excitation-energy harvesting and enhancing the upconversion luminescence of such UCNCs. In this work, an ultrasmall (similar to 6.5 nm in diameter) beta-NaGdF4:Yb3+,Er3+ core and related core@shell UCNCs were sensitized using six NIR-excitable cyanine dyes with a wide range of functional groups and optical properties. The greatest UC enhancement of 680-times was observed for the conjugate between the Cy 754 dye and NaGdF4:Yb3+,Er3+@NaGdF4:10%Yb3+,30%Nd3+ core@shell UCNCs excited using a 754 nm laser. The enhancement was estimated relative to NaGdF4:Yb3+,Er3+@NaGdF4:10%Yb3+,30%Nd3+ core@shell UCNCs capped with oleic acid and excited using a similar intensity (75 W cm(-2)) of a 980 nm laser. UC intensity measurements for identical dye-sensitized UCNCs carried out in methanol and in deuterated methanol under argon, as well as in air, allowed us to reveal the connection of the dye triplet states with UCNC sensitization as well as of the hydroxyl groups with quenching of the excited states of lanthanide ions. For UCNCs dispersed in methanol, the strong quenching UC luminescence was always observed, including core@shell UCNCs (with a shell of similar to 2 nm). A strong influence of the triplet states of the dyes was observed for the two dyes Cy 754 and Cy 792 that bind firmly to UCNCs and allow the distances between the dye and the UCNC to be reduced, whereas the contribution of this sensitization pathway is very insignificant for Cy 740 and Cy 784 dyes that bind weakly to UCNCs.
ER  - 

NASRABADI, Hossein Beygi, Eduard MADIROV, Radian POPESCU, Lenka ŠTACKOVÁ, Peter ŠTACKO, Petr KLÁN, Bryce S. RICHARDS, Damien HUDRY a Andrey TURSHATOV. Coordination mechanism of cyanine dyes on the surface of core@active shell β-NaGdF4:Yb3+,Er3+ nanocrystals and its role in enhancing upconversion luminescence. \textit{Journal of Materials Chemistry C}. CAMBRIDGE: Royal Society of Chemistry, 2021, roč.~9, č.~45, s.~16313-16323. ISSN~2050-7526. Dostupné z: https://dx.doi.org/10.1039/d1tc03333f.