Observation of Size Dependence in Multicolor Upconversion in Single Yb3+, Er3+ Codoped NaYF4 Nanocrystals
Citations Over TimeTop 10% of 2009 papers
Abstract
In this Letter we report on the investigation of the upconversion emission of single NaYF(4) nanocrystals codoped with Yb(3+) and Er(3+). Single nanocrystals on a coverslip are excited with continuous wave laser light at 973 nm in a confocal setup and the upconversion fluorescence is analyzed with a spectrometer. With the help of an atomic force microscope the size of the nanocrystals is simultaneously determined. A strong size-dependence of the spectral properties of the upconversion signal of individual nanocrystals is observed. We attribute this to a differing number of available phonons in the individual crystals for multiphonon relaxation processes, depending on their size. We believe that this result provides a new strategy in the synthesis of upconversion nanoparticles with different spectral properties by changing only their size as it is well-known from the case of semiconductor quantum dots.
Related Papers
- → Novel materials doped with trivalent lanthanides and transition metal ions showing near-infrared to visible photon upconversion(2005)619 cited
- → Photoluminescence upconversion of 2D materials and applications(2021)21 cited
- FREQUENCY UPCONVERSION FLUORESCENCE OF Er 3+ -DOPED TeO 2-WO3 GLASS(2005)
- Energy transfer and frequency upconversion in Er~（3＋）-Yb~（3＋） codoped oxy-fluoro-tungstosilicate glasses(2012)
- → Model for efficient upconversion detection at mid-infrared(2019)