Energy Migration Upconversion in Ce(III)-Doped Heterogeneous Core−Shell−Shell Nanoparticles

Xian Chen, Limin Jin, Tianying Sun, Wei Kong, Siu Fung Yu, Feng Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)

Abstract

KGaA, Weinheim One major challenge in upconversion research is to develop new materials and structures to expand the emission spectrum. Herein, a heterogeneous core−shell−shell nanostructure of NaYbF4:Gd/Tm@NaGdF4@CaF2:Ce is developed to realize efficient photon upconversion in Ce3+ ions through a Gd-mediated energy migration process. The design takes advantage of CaF2 host that reduces the 4f–5d excitation frequency of Ce3+ to match the emission line of Gd3+. Meanwhile, CaF2 is isostructural with NaGdF4 and can form a continuous crystalline lattice with the core layer. As a result, effective Yb3+ → Tm3+ → Gd3+ → Ce3+ energy transfer can be established in a single nanoparticle. This effect enables efficient ultraviolet emission of Ce3+ following near infrared excitation into the core layer. The Ce3+ upconversion emission achieved in the core−shell−shell nanoparticles features broad bandwidth and long lifetime, which offers exciting opportunities of realizing tunable lasing emissions in the ultraviolet spectral region.
Original languageEnglish
Article number1701479
JournalSmall
Volume13
Issue number43
DOIs
Publication statusPublished - 20 Nov 2017

Keywords

  • cerium upconversion
  • core−shell nanoparticles
  • energy migration
  • tunable ultraviolet lasing

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

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