Issue 26, 2019

Thermally enhanced NIR–NIR anti-Stokes emission in rare earth doped nanocrystals

Abstract

Nanoparticles with anti-Stokes emissions have enabled many sensing applications, but their efficiencies are considerably low. The key to enable the process of anti-Stokes emissions is to create phonons that assist the excited photons to be pumped from a lower energy state onto a higher one. Increasing the temperature will generate more phonons, but it unavoidably quenches the luminescence. Here by quantifying the number of phonons being generated from the host crystal and those at the surface of Yb3+/Nd3+ co-doped nanoparticles, we systematically investigated mechanisms towards the large enhancements of the phonon-assisted anti-Stokes emissions from 980 nm to 750 nm and 803 nm. Moreover, we provided direct evidence that moisture release from the nanoparticle surface at high temperature was not the main reason. We further demonstrated that the brightness of 10 nm nanoparticles was enhanced by more than two orders of magnitude, in stark contrast to the thermal quenching effect.

Graphical abstract: Thermally enhanced NIR–NIR anti-Stokes emission in rare earth doped nanocrystals

Supplementary files

Article information

Article type
Paper
Submitted
09 Apr. 2019
Accepted
06 Jūn. 2019
First published
10 Jūn. 2019

Nanoscale, 2019,11, 12547-12552

Thermally enhanced NIR–NIR anti-Stokes emission in rare earth doped nanocrystals

C. Mi, J. Zhou, F. Wang and D. Jin, Nanoscale, 2019, 11, 12547 DOI: 10.1039/C9NR03041G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements