In by admin

Name Mr. Matthew Ellis
Organization or Institution Florida State University
Presentation Type Poster
Topic Materials Chemisry
Title

Magneto-optical properties of lanthanide-doped nanospinels

Author(s)

Matthew C. Ellis, David Hardy, Rodney Tigaa, Stephen McGill, Geoffrey F. Strouse, and Naresh Dalal

Author Institution(s)

Florida State University, National High Magnetic Field Laboratory

Abstract

High performance down-shifting phosphors are being developed for applications in solid-state lighting. These materials absorb higher energy photons and convert them to lower energy single photons. The use of trivalent lanthanide (Ln3+) ions (Ln=Eu, Tb, Er, Dy, Sm, Y, or Yb) doped into semiconductor nanoparticles allows for color-pure emission, which is currently in high demand commercially, due to the narrow emission linewidths (FHWM≈10 nm). While lanthanides have been thoroughly studied in virtually every aspect, pertaining to photophysics, few studies have been conducted on the magneto-optical properties of the 4f elements. A magnetic effect on photoluminescence (PL) emission intensity has been observed in lanthanide-doped materials and attributed to changes in site symmetry of the Eu3+ ion, cross-relaxation and Zeeman splitting effects. PL emission spectra collected on Ln3+-doped zinc aluminate (ZnAl2O4:Ln) and zinc gallate (ZnGa2O4:Ln) nanospinels in a 17.5 T superconducting magnet will be discussed to better understand the source of the observed emission quenching.