Abstract
A crystal design strategy is described that generates hexagonal-phased NaYF4:Nd/Yb@NaYF4:Yb/Tm luminescent nanocrystals with the ability to emit light at 803 nm when illuminated at 745 nm. This is accomplished by taking advantage of the large absorption cross-section of Nd3+between 720 and 760 nm plus efficient spatial energy transfer and migration through Nd3+→Yb3+→Yb3+→Tm3+. Mechanistic investigations suggest that a cascaded two-photon energy transfer upconversion process underlies the emission mechanism. This protocol enables deep-tissue imaging to be achieved while mitigating the attenuation effect associated with the visible emission and the overheating constraint imposed by conventional 980 nm excitation.
Original language | English (US) |
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Pages (from-to) | 10801-10807 |
Number of pages | 7 |
Journal | Chemistry - A European Journal |
Volume | 22 |
Issue number | 31 |
DOIs | |
State | Published - Jul 25 2016 |
Keywords
- doping
- lanthanide
- nanocrystals
- optical window
- overheating effects
ASJC Scopus subject areas
- General Chemistry
- Catalysis
- Organic Chemistry