Enhancement of optical characteristics of green-emitting single-phase Lu3Al5O12: Ce3+ phosphor using CeO2@B2O3 core-shell, for white light generation

Abstract

High quality and single-phase Lu3Al5O12 phosphor materials are prepared with a solid state reaction method using CeO2@B2O3 core-shell structure. This technique makes it possible to obtain pure phase and allows enhancement of Lu3Al5O12 phosphor. The transmittance eletron microscope image and electron energy loss spectrum of the CeO2@B2O3 core-shell structure particles show that the B2O3 coating is uniform, with a thickness of around 10 nm, and that the core-shell structure is consisted of Ce and B elements. The Lu3Al5O12: Ce3+ phosphor using CeO2@B2O3 core-shell structure shows a higher emission intensity than other ones. The phosphor-converted white LEDs were realized with Lu3Al5O12: Ce3+ phosphor, which shows a high CRI value with a luminous efficacy of 104.58 lm/W. This phosphor and the synthesis method are expected to be promising candidates for realizing the white LEDs. (C) 2013 Elsevier B.V. All rights reserved.