白光发光二级管用红色荧光粉LiSrBO3: Eu3+的制备与发光性能研究

采用高温固相法制备了LiSrBO₃:xEu³⁺ 荧光粉, 并通过XRD, 红外(FITR) 和荧光光谱(PL) 等对其表征. 结果表明, LiSrBO₃: Eu³⁺ 荧光粉可被波长为395 nm 的紫外线和466 nm 的蓝光有效激发, 且发射主波长为612 nm (Eu³⁺的电偶极跃迁⁵D₀ →⁷F₂) 的红光. 研究了Eu³⁺ 掺杂浓度对LiSrBO₃: Eu³⁺ 材料发光强度的影响, Eu³⁺ 掺杂浓度为6% 时样品的发射强度最大, 并且证实Eu³⁺ 之间的能量传递机制为电偶极子- 电偶极子相互作用. Li⁺, Na⁺, K⁺ 作为电荷补偿剂的引入全部导致LiSrBO₃: Eu³⁺ 材料发射强度增强, 其中, Li⁺ 的引入要优于Na⁺ 和K⁺. 少量Al³⁺的掺杂降低了Eu³⁺ 所处格位的对称性, 增强了Eu³⁺ 的612 nm 的电偶极发射, 改善了LiSrBO₃: Eu³⁺ 红色材料的色纯度.关键词：白光发光二级管光致发光浓度猝灭电荷补偿剂

Preparation and photoluminescence of LiSrBO3:Eu3+ red-emitting phosphors for white leds

LiSrBO₃:xEu³⁺ phosphors were synthesized by conventional solid-state reaction and were systematically characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and photoluminescence spectroscopy. The excitation and emission spectra reveal that the LiSrBO₃:Eu³⁺ phosphor can be effectively excited by ultraviolet (395 nm) and blue (466 nm) light and exhibits a satisfactory red performance which peaked at around 612 nm corresponding to the ⁵D₀ → ⁷F₂ transitions of Eu³⁺. The concentration quenching mechanism was verified to be a dipole–dipole interaction. The dopant R⁺ (R⁺ = Li⁺, Na⁺ and K⁺) as charge compensator can further enhance luminescence intensity, and the emission intensity of the phosphor doped Li⁺ is higher than that doped with Na⁺ or K⁺. Introduction of Al³⁺ reduced the symmetry of the crystal field and increased the emission of 612 nm (⁵D₀ → ⁷F₂), which improved the chromaticity coordinates of LiSrBO₃: Eu³⁺ phosphor.
Keywords：white LEDphotoluminescenceconcentration quenchingcharge compensator