Back to Search
Start Over
Markedly enhanced up-conversion luminescence by combining IR-808 dye sensitization and core–shell–shell structures.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 2/7/2017, Vol. 46 Issue 5, p1495-1501, 7p
- Publication Year :
- 2017
-
Abstract
- Rare-earth-doped up-conversion nanoparticles (UCNPs), which are capable of converting infrared light to shorter-wavelength photons, have attracted worldwide attention due to their unique characteristics. However, the emission brightness of UCNPs is greatly limited by the unsatisfactory absorptivity of lanthanide ions. Herein, we adopted a novel strategy to enhance the up-conversion intensity using NIR dye IR-808 as an antenna to sensitize the core–shell–shell structured NaGdF<subscript>4</subscript>:Yb,Er@NaGdF<subscript>4</subscript>:Yb@NaNdF<subscript>4</subscript>:Yb UCNPs. When excited with 808 nm light, the IR-808 emitted a broadband peak, which perfectly overlapped with the absorption of Nd<superscript>3+</superscript> and Yb<superscript>3+</superscript> ions. Thus, the active shell of NaNdF<subscript>4</subscript>:Yb can efficiently capture the emitted NIR photons and transfer them to the transition layer of NaGdF<subscript>4</subscript>:Yb. The transition layer acted as an energy bridge to connect the active shell and up-converting zone, avoiding the energy back-transfer from the activators to Nd<superscript>3+</superscript> ions. The optimized dye sensitization combined with the well-designed core–shell–shell structure tremendously enhances the NIR photon absorptivity of UCNPs and eliminates the deleterious cross-relaxation between the activators and sensitizers, eventually leading to dramatic enhancement of the up-conversion intensity. This study provides a new insight into the dye-sensitized up-conversion luminescence of rare earth-based nanoparticles and facilitates their practical applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- RARE earth metals
NANOPARTICLES
PHOTONS
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 46
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 121046992
- Full Text :
- https://doi.org/10.1039/c6dt04529d