Bulk-like emission in the visible spectrum of colloidal LiYF4:Pr nanocrystals downsized to 10 nm

authored by
Rajesh Komban, Simon Spelthann, Michael Steinke, Detlev Ristau, Axel Rühl, Christoph Gimmler, Horst Weller
Abstract

Though Pr3+ doped LiYF4 (LiYF4:Pr3+) bulk crystals are a well-known laser gain material with several radiative transitions, their nanocrystal counterparts have not been investigated with regards to these. Through downsizing to the nanoscale, novel applications are expected, especially in composite photonic devices. For example, nanocrystals in stable colloidal form with narrow size distribution are highly desirable to reduce scattering in such composites. Herein, we synthesized monodispersed LiYF4:Pr3+ nanocrystals having a size of 10 nm resulting in colorless clear stable colloidal dispersions and conducted an extensive optical characterization for the first time. We observed unexpected yet intense emission with excited state lifetimes comparable to bulk crystals in the visible spectrum through excitation at 444 nm and 479 nm. In macroscopic bulk crystals, this emission is only exploitable through excitation of a different, subjacent energy level. A comprehensive comparison to the bulk crystals provides deeper insight into the excitation mechanism and performance of these nanocrystals. The presented results pave the way for developing application-oriented LiYF4:Pr3+ nanocrystals as emitters with tailored properties for quantum optics or biomedical applications.

Organisation(s)
Institute of Quantum Optics
QuantumFrontiers
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
External Organisation(s)
Universität Hamburg
Type
Article
Journal
Nanoscale Advances
Volume
4
Pages
2973-2978
No. of pages
6
Publication date
25.04.2022
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Bioengineering, Atomic and Molecular Physics, and Optics, Chemistry(all), Materials Science(all), Engineering(all)
Electronic version(s)
https://doi.org/10.1039/d2na00045h (Access: Open)