Effect of charge transfer band on luminescence properties of Yb doped Y2O3 nano particles for blue-far yellow emission

TL;DR

This study explores how charge transfer bands influence the luminescence of Yb-doped Y2O3 nanoparticles, revealing enhanced broad emission in the visible spectrum suitable for white light applications.

Contribution

It demonstrates the role of charge transfer bands in Yb-doped Y2O3 nanoparticles and their impact on broad visible emission, a novel insight into luminescence mechanisms.

Findings

Charge transfer bands are modified by Yb doping.

Yb doping induces broad emission from 400 to 650 nm.

Enhanced white light emission observed under 335 nm excitation.

Abstract

The photoluminescence properties of Yb doped Y2O3 nanoparticles are investigated in visible region. The presence of peaks at 335 nm and 370 nm in the excitation spectra of bulk as well as in nano Yb: Y2O3 and their absence in pure Y2O3 confirm its origin due to Yb3+ dopant. The Yb doping in nano Y2O3 not only modify the charge transfer bands (CTB) but also helps in transition of electron from these CTBs to ground 2F5/2 and 2F7/2 levels of Yb. This results in strong intense broad emission from ~400 to ~650 nm (white light emission range) for 335 nm excitation.