白光LED用红色荧光粉Sr2EuxGd1-xAlO5的制备及其发光性质

用高温固相反应法合成了Sr₂Eu_xGd_1-xAlO₅红色荧光粉,研究了荧光粉的晶体结构和发光性质。在紫外光和近紫外光激发下,样品的发射光谱由Eu³⁺的⁵D₀→⁷F_J(J=0,1,2,3,4) 特征发射组成,其中Eu³⁺离子的⁵D₀→⁷F₁(λ=590 nm)和⁵D₀→⁷F₂(λ=622 nm)跃迁发射的强度最大。当Eu³⁺离子的摩尔分数为 0.75时,样品的发光最强。研究结果表明,Sr₂Eu_xGd_1-xAlO₅荧光粉是一种在近紫外芯片白光LED上有应用前景的红光荧光粉。

Preparation and Photoluminescence Properties of Red Emitting Sr2EuxGd1-xAlO5 Phosphor for White LED

The red emitting phosphor Sr₂Eu_xGd_1-xAlO₅ was synthesized through the solid-state reaction technique. The structure, photoluminescence properties of Sr₂Eu_xGd_1-xAlO₅ were described. Under the excitation of UV and near UV light, the photoluminescence emission spectra can be assigned to the well-known transitions of Eu³⁺ from the initial state ⁵D₀ to the final states ⁷F_J(J=0, 1, 2, 2, 4). The two strong emissions peak at 590 nm and 622 nm, which arose from the ⁵D₀-⁷F₁ and ⁵D₀-⁷F₂ transitions of Eu³⁺, respectively. When the mole fraction of Eu³⁺ is 0.75, the emission intensity of the phosphor is the strongest. This phosphor is considered to be a potential red-emitting phosphor for NUV chip white LED.