Red-emitting SrLu₂O₄:Eu³⁺ phosphors were prepared by a high-temperature solid-state reaction approach, and they were characterized by X-ray diffraction (XRD), excitation and emission spectra, luminescence decay lifetimes, CIE chromaticity coordinates, and temperature-dependent emission spectra. Rietveld refinement of XRD pattern revealed that the SrLu₂O₄:Eu³⁺ phosphors crystallized into orthorhombic crystal system with a space group of Pnma and cell parameters of a = 9.962(1) Å, b = 3.343(5) Å, c = 11.746(2) Å, α = β = γ = 90°, and V = 391.24(3) ų. Under 395 nm excitation, these SrLu₂O₄:Eu³⁺ phosphors showed intense red emissions in the 550-750 nm wavelength range with peaks around 581, 593, 611, 653, and 708 nm, corresponding to the ⁵D₀→⁷F_J (J = 0-4) transitions of Eu³⁺ ions. Investigation on Eu³⁺ doping concentration dependent emission spectra demonstrated the critical quenching concentration of Eu³⁺ ions was 9 mol%. The luminescence decay lifetimes declined from 1.77 to 1.51 ms with increasing Eu³⁺ concentration from 1 to 10 mol%. Notably, the CIE chromaticity coordinates (0.646, 0.354) of composition-optimal SLO:9%Eu³⁺ phosphors were close to the standard red light (0.67, 0.33), and its color purity reached as high as 94.1%. Finally, it was found that the SLO:9%Eu³⁺ phosphors also had excellent thermal stability and color stability at higher temperatures. The emission intensity at 423 K was dropped to 89% of that at 303 K, and the activated energy of thermal quenching was 0.32 eV.

通过高温固态反应方法制备了红色发光的SrLu ₂ O ₄：Eu ³⁺荧光粉，并通过X射线衍射（XRD），激发和发射光谱，发光衰减寿命，CIE色度坐标对其进行了表征。以及与温度有关的发射光谱。XRD图案的Rietveld精炼显示，SrLu ₂ O ₄：Eu ³⁺荧光粉结晶成正交晶体系统，其空间群为Pnma，单元参数为a  = 9.962（1）Å，b  = 3.343（5）Å，c  = 11.746（2）Å，α=β=γ= 90 °，和V = 391.24（3）³。在395 nm激发下，这些SrLu ₂ O ₄：Eu ³⁺荧光粉在550-750 nm波长范围内显示出强烈的红色发射，峰值在581、593、611、653和708 nm左右，对应于⁵ D ₀ → ⁷ Eu ³⁺离子的F _J（J = 0-4）跃迁。Eu ³⁺掺杂浓度依赖性发射光谱的研究表明，Eu ³⁺离子的临界猝灭浓度为9 mol％。随着Eu ^3+的增加，发光衰减寿命从1.77降低到1.51 ms浓度为1至10 mol％。值得注意的是，组成最佳的SLO：9％Eu ³⁺荧光粉的CIE色度坐标（0.646，0.354）接近标准红光（0.67，0.33 ），其色纯度高达94.1％。最后，发现SLO：9％Eu ³⁺荧光粉在高温下也具有出色的热稳定性和颜色稳定性。423 K时的发射强度降至303 K时的89％，热猝灭的活化能为0.32 eV。