We explored dual precipitating reagents-assisted Ce-based deep blue-emitting borate and near-white oxide-based luminescent materials. The first precipitating reagent (aqueous sodium borohydride) was used until gelation. The second precipitating reagent (ammonia solution) was employed to prepare as-synthesized powders. XRD analysis, FTIR spectroscopy, and Raman spectroscopy of calcined powders ranging from 1000 °C to 1400 °C confirmed the development of a primary borate phase (i.e., nearly polyhedral-shaped YBO₃) with secondary phases of (Y,Al)BO₃ and oxide. However, the preliminary oxide phase (i.e., elongated/rod-like YAG) and secondary phases of YBO₃, Al₂O₃, and CeO₂ were developed at 1500 °C with different holding times. The emission behavior and CIE coordinates confirmed that the borate (i.e., YBO₃-based) sample was deep blue. However, the oxide (i.e., YAG-based) sample showed tunable color emissions from light blue to near white with increased holding time. The average lifetime of prepared samples varied between 788 ns and 891 ns, which indicated a long decay time. The quantum yield of the sample calcined at 1400–1500 °C varied between ∼61% and ∼77%. Based on the emission behavior, CIE diagram, CCT, powder color, average lifetime, and quantum yield, the developed deep blue-emitting borate and light blue/near white oxide-based luminescent materials could be used in lighting industries.

中文翻译：

---

双沉淀剂辅助的深蓝光硼酸盐和近白氧化物基发光材料


我们探索了双沉淀剂辅助的 Ce 基深蓝光硼酸盐和近白色氧化物基发光材料。使用第一沉淀剂（硼氢化钠水溶液）直至凝胶化。使用第二沉淀剂（氨溶液）来制备合成粉末。 1000 °C 至 1400 °C 范围内的煅烧粉末的 XRD 分析、FTIR 光谱和拉曼光谱证实了初生硼酸盐相（即近多面体形状的 YBO ₃ ）和次生相（ Y,Al)BO ₃ 和氧化物。然而，初步氧化物相（即细长/棒状 YAG）和 YBO ₃ 、 Al ₂ O ₃ 和 CeO ₂ 在 1500 °C 下以不同的保持时间进行开发。发射行为和 CIE 坐标证实硼酸盐（即 YBO ₃ 基）样品为深蓝色。然而，随着保持时间的增加，氧化物（即基于 YAG 的）样品显示出从浅蓝色到接近白色的可调颜色发射。所制备样品的平均寿命在 788 ns 至 891 ns 之间变化，这表明衰减时间较长。在 1400–1500 °C 下煅烧的样品的量子产率在~61% 和~77% 之间变化。根据发射行为、CIE图、CCT、粉末颜色、平均寿命和量子产率，开发的深蓝光硼酸盐和浅蓝光/近白氧化物基发光材料可用于照明行业。