白光LED用Ca3Si3O9：Dy3+荧光粉的制备及其发光性能

采用溶胶-凝胶法制备了可用于白光LED的新型Ca₃Si₃O₉:Dy³⁺荧光粉, 通过对样品的X 射线衍射谱及光致发光光谱的测试和表征, 研究了Ca₃Si₃O₉:Dy³⁺的物相结构和发光性能. 结果显示, Ca₃Si₃O₉:Dy³⁺的发射光谱是由位于483 nm和577 nm处的主峰构成的双峰谱线, 激发光谱为多峰宽谱, 谱峰位于290–480 nm范围内. Dy³⁺掺杂浓度对Ca₃Si₃O₉:Dy³⁺发光性能有明显的影响, 随着Dy³⁺浓度的增大, Ca₃Si₃O₉:Dy³⁺的发光强度和黄、蓝光发射强度比 (Y/B) 均呈现先增大后减小的规律, 最大发光强度值对应的Dy³⁺浓度为1 mol%. 电荷补偿剂Li⁺能提高Ca₃Si₃O₉:Dy³⁺的发光强度, 特别当Li⁺浓度为2–4 mol%时, 荧光粉的蓝光发射强度显著增大. 关键词： 白光LED 溶胶-凝胶法 3Si₃O₉：Dy³⁺')" href="#">Ca₃Si₃O₉：Dy³⁺ 发光特性

Preparation and luminescent properties of Ca3Si3O9:Dy3+phosphors for white LED

A novel Ca₃Si₃O₉:Dy³⁺ phosphor for white LED was prepared by sol-gel method. The structure and luminescent properties of Ca₃Si₃O₉:Dy³⁺ phosphors with different concentration of Dy³⁺ and charge compensator Li⁺ were characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectra. Results show that the emission spectrum consists of two main band peaks locatied at 483 nm and 577 nm, while the peaks of excitation spectrum are located in the rang of 290–480 nm. Both of luminescent intensity and the ratio of yellow to blue emission (Y/B) increase first and then decrease with increasing Dy³⁺ concentration; and the luminescent intensity reaches a maximum when Dy³⁺ concentration is of 1 mol%. The luminescent intensity of Ca₃Si₃O₉:Dy³⁺can be enhanced by Li⁺, and the blue emission increases greatly when Li⁺ concentration is within the range of 2 to 4 mol%.
Keywords： white LED sol-gel method 3Si₃O₉：Dy³⁺')" href="#">Ca₃Si₃O₉：Dy³⁺ luminescent properties