Realizing Bright Blue-Red Color-Tunable Emissions from Gd 2 GeO 5 :Bi 3+ Eu3+ Phosphors Through Energy Transfer Toward Light-Emitting Diodes
2019
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.
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