Realizing Bright Blue-Red Color-Tunable Emissions from Gd <sub>2</sub>GeO <sub>5</sub>:Bi <sup>3+</sup>Eu3+ Phosphors Through Energy Transfer Toward Light-Emitting Diodes

Abstract

Novel Bi3+/Eu3+ ions co-doped Gd2GeO5 (GGO) phosphors were prepared by a high-temperature solid-state reaction method. X-ray diffraction, photoluminescence, and CIE chromaticity coordinates were applied to analyze the as-obtained phosphors. The as-prepared GGO:Bi3+,Eu3+ phosphors showed color-tunable emissions from blue (Bi3+) to red (Eu3+) with increasing the Eu3+ doping concentration via a high-efficiency energy transfer process. Moreover, the mechanism of energy transfer from Bi3+ to Eu3+ ions was the dipole-quadrupole interaction. All these meaningful results demonstrated that blue-red color-tunable GGO:Bi3+,Eu3+ phosphors have potential applications in white light-emitting diodes (LEDs) and plant growth LEDs.