Optical Properties of Er³⁺-Doped CdIn₂O₄ and CdIn₂O₄ Crystals

Abstract

3+ adopt a cubic structure with respective lattice constants of a = 9 1655 Å and a = 9 1662 Å. The optical absorption spectra obtained near the fundamental absorption edge showed that these compounds have a direct energy band gap. The photoluminescence (PL) spectra of CdIn 2 O 4 :Er 3+ acquired in the wavelength range of 630-700 nm at 294 K showed peaks in the region of 651-686 nm and eight sharp emission peaks due to the Er 3+ ions. These PL peaks were attributed to radiative transitions between the split electron energy levels of the Er 3+ ions occupying the In 3+ sites of the CdIn 2 O 4 host lattice.