Abstract Novel Bi3+/Eu3+ ions co-doped Gd2GeO5 (GGO) phosphors were prepared by a high-temperature solid-state reaction method. X-ray diffraction, photoluminescence (PL), CIE chromaticity coordinates, internal quantum efficiency (IQE), and temperature-dependent PL spectra were applied to analyze the as-obtained phosphors. The emission spectra of the GGO:Bi3+,Eu3+ phosphors showed both a broad blue band of Bi3+ emission centered at 453 nm and the characteristic sharp red emission lines of Eu3+, corresponding to the 3P1→1S0 allowed transition of the Bi3+ ions and the 5D0→7FJ (J = 0, 1, 2, 3, 4) transitions of the Eu3+ ions, respectively. Notably, the as-prepared GGO:Bi3+,Eu3+ phosphors exhibited 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 determined to be the dipole-quadrupole interaction. Impressively, the optimal GGO:0.05Bi3+,0.12Eu3+ phosphors had an outstanding IQE as great as 88% and good thermal stability. 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.

中文翻译：

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通过向发光二极管的能量转移实现 Gd2GeO5:Bi3+,Eu3+ 荧光粉的明亮蓝红色可调发射

摘要 采用高温固相反应法制备了新型Bi3+/Eu3+离子共掺杂Gd2GeO5(GGO)荧光粉。应用 X 射线衍射、光致发光 (PL)、CIE 色度坐标、内量子效率 (IQE) 和温度相关 PL 光谱来分析所获得的磷光体。GGO:Bi3+,Eu3+ 荧光粉的发射光谱显示出以 453 nm 为中心的宽蓝色 Bi3+ 发射带和 Eu3+ 的特征性尖锐红色发射线，对应于 3P1→1S0 允许 Bi3+ 离子和 5D0→ Eu3+ 离子的 7FJ (J = 0, 1, 2, 3, 4) 跃迁分别。值得注意的是，随着通过高效能量转移过程增加 Eu3+ 掺杂浓度，所制备的 GGO:Bi3+,Eu3+ 荧光粉表现出从蓝色 (Bi3+) 到红色 (Eu3+) 的颜色可调发射。而且，从 Bi3+ 到 Eu3+ 离子的能量转移机制被确定为偶极-四极相互作用。令人印象深刻的是，最佳的 GGO:0.05Bi3+,0.12Eu3+ 荧光粉具有高达 88% 的出色 IQE 和良好的热稳定性。所有这些有意义的结果表明，蓝红色可调 GGO:Bi3+,Eu3+ 荧光粉在白光发光二极管 (LED) 和植物生长 LED 中具有潜在应用。