Near white light and near-infrared luminescence in perovskite Ga:LaCrO3

We report the realization of near-white light emission (near-WLE) and the selective tuning to the near-infrared (NIR) luminescence from Ga substituted lanthanum chromite perovskite with electron-beam excitation for the first time. The near-WLE in Cathodoluminescence (CL), arises from the combination of T-4(1)(F)->(4)A(2) (blue), T-4(1) (P)->(4)A(2) (green) and T-4(2)->(4)A(2) (red) spin allowed transitions and E-2 ->(4)A(2) spin forbidden transitions from the Cr3+ ion. The spin allowed transitions from the Cr3+ ions is rare, however can be accomplished by adjusting the Cr3+/Ga3+ ion concentration in the host lattice. The NIR emission originates from the selective( 2)E ->(4)A(2) transition, which increases with the increasing concentration of Ga(3+)ions. Moreover, the Density Functional Theory (DFT) calculations point out the presence of extra electronic states in the NIR region with Ga substitution, which elucidates the observation of NIR emission in Ga substituted samples. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study reports the realization of near-white light emission and selective tuning of near-infrared luminescence in Ga-substituted lanthanum chromite perovskite using electron-beam excitation. The near-white light emission is a combination of spin allowed transitions and spin forbidden transitions from the Cr3+ ion, while the near-infrared emission is associated with the concentration of Ga3+ ions.