Integrating temporal and spatial control of electronic transitions for bright multiphoton upconversion.

ABSTRACT: The applications of lanthanide-doped upconversion nanomaterials are limited by unsatisfactory brightness currently. Herein, a general strategy is proposed for boosting the upconversion efficiency in Er³⁺ ions, based on combined use of a core-shell nanostructured host and an integrated optical waveguide circuit excitation platform. A NaErF₄@NaYF₄ core-shell nanoparticle is constructed to host the upconversion process for minimizing non-radiative dissipation of excitation energy by surface quenchers. Furthermore, an integrated optical microring resonator is designed to promote absorption of excitation light by the nanoparticles, which alleviates quenching of excited states due to cross-relaxation and phonon-assisted energy transfer. As a result, multiphoton u

SUBMITTER: Sun T 

PROVIDER: S-EPMC6472381 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature