Abstract In this paper, a series of Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) precursor were synthesized by co-precipitation method using ammonium bicarbonate as precipitant and rare earth nitrate as mother salt solution, following calcined at 1500 °C to obtain resultant phosphor. The garnet lattice stability, microstructure, structural characteristics and fluorescence properties were investigated by FT-IR, XRD, FE-SEM, PL/PLE and fluorescence decay analysis, respectively. The resultant phosphors Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) with uniform particle morphology and size display good red emission at ∼677 nm (2E→4A2 transition of Mn4+) under excitation wavelength of 322 nm (4A2→4T1 transition of Mn4+). The quenching concentration of Mn4+ ions were determined to be ∼0.02 at.%, and the quenching mechanism was due to the electric dipole-quadruple interactions. The Ca2+, Mg2+, Sr2+, Ba2+ and Zn2+ doping can significantly enhance the red emission of Mn4+ ions owing to the charge compensation effect. The Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) garnet phosphors with good luminescent properties are expected to be widely used in lighting and display areas.

中文翻译：

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Mn4+掺杂(Gd,Y)3Al5O12荧光粉的合成及发光性能研究

摘要 本文以碳酸氢铵为沉淀剂，硝酸稀土为母盐溶液，通过共沉淀法合成了一系列 Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) 前驱体，在 1500 °C 下煅烧。得到最终的荧光粉。通过FT-IR、XRD、FE-SEM、PL/PLE和荧光衰变分析分别研究了石榴石的晶格稳定性、微观结构、结构特征和荧光性能。所得荧光粉 Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) 具有均匀的颗粒形态和尺寸，在 322 nm 激发波长（4A2→4T1 跃迁）下，在~677 nm（Mn4+ 的 2E→4A2 跃迁）处显示出良好的红光发射Mn4+）。Mn4+ 离子的猝灭浓度被确定为~0.02 at.%，猝灭机制是由于电偶极-四重相互作用。由于电荷补偿效应，Ca2+、Mg2+、Sr2+、Ba2+和Zn2+掺杂可以显着增强Mn4+离子的红光发射。具有良好发光性能的 Gd2.4Y0.6Al5-xMnxO12 (x = 0.0001–0.003) 石榴石荧光粉有望广泛应用于照明和显示领域。