Synthesis and Luminescence Properties of Eu^sup 3+^ Doped High Temperature Form of Bi^sub 2^MoO^sub 6

Issue Title: Special Section: 3D Printing. Guest Editors: Kyoung-sik (Jack) Moon, Raymond C. Rumpf, Namsoo P. Kim, and Seung-Kyum Choi This work reports on the luminescence properties of the Eu^sup 3+^-doped high-temperature form of Bi^sub 2^MoO^sub 6^ by a solid-state reaction technique at high temperature. Various characterization methods including x-ray diffraction, scanning electron microscopic, Fourier transform infrared, and fluorescence spectroscopy measurements were utilized in order to investigate the phase purity and surface morphology as well as photoluminescence properties for as-prepared phosphors. The spectroscopic characteristics including excitation and emission spectrum, concentration quenching phenomenon, decay curves, and chromaticity coordinates are discussed in detail. The nature of the luminescence behavior of Eu^sup 3+^ was understood in term of the Judd-Ofelt theory, and the luminescent quantum efficiency of ^sup 5^D^sub 0^ [arrow right] ^sup 7^F^sub 2^ transition of Eu^sup 3+^ was estimated. The as-prepared phosphors can be effectively excited with a 465-nm blue light, and exhibit a reddish-orange emission belonging to the prevailing ^sup 5^D^sub 0^ [arrow right] ^sup 7^F^sub 2^ transition of Eu^sup 3+^ with a decay time of milliseconds. This indicates that the Bi^sub 2^MoO^sub 6^:Eu^sup 3+^ phosphors could have potential application in white light-emitting diodes (w-LEDs) based on blue LED chips.