【摘要】 为研发白光LED（light-emitting diodes,发光二极管）用红色荧光粉,采用高温固相法制备了可被近紫外光有效激发的Sr₂SnO₄∶Eu³⁺荧光粉,对样品分别进行了X-射线衍射（XRD）、扫描电镜（SEM）和荧光光谱（PL）的测定。结果表明:当烧结温度为1 300℃时,可以得到Sr₂Sn O₄的纯相,所制备的Sr_1.90SnO₄∶Eu_0.10³⁺荧光粉颗粒的粒径大小约为1²μm,颗粒形状较规则;Sr₂SnO₄:Eu³⁺荧光粉能够被392 nm的紫外光有效激发,在611 nm处发出较强的红色荧光,对应于Eu³⁺的5D0→7F2电偶极跃迁。392 nm处的吸收峰与目前应用的紫外光LED芯片相匹配,表明Sr₂Sn O₄∶Eu³⁺红色荧光材料在白光LED领域具有潜在的应用前景。更多还原

【Abstract】 In order to develop phosphors for white light emitting diodes（ LED）,a phosphor of Sr₂SnO₄∶ Eu³⁺,which could be efficiently stimulated by near-UV light,was prepared by high temperature solid-state reaction. Structure,morphology and photoluminescence properties（ PL） of the samples were characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and fluorescence spectrophotometer,respectively. Results showed that the pure phase of Sr₂SnO₄ could be achieved at 1 300 ℃,and the average diameter of particles was 1 2 μm. Sr₂-xSnO₄∶ Eu_x³⁺phosphors could be effectively excited at 392 nm and irradiated red light at 611 nm due to the forced electric dipole ⁵D₀→⁷F₂ transitions of Eu³⁺. It was demonstrated that Sr₂SnO₄∶ Eu³⁺phosphor was a promising red component for possible applications in the white light emitting diodes.更多还原