The discovery of near-ultraviolet-excited orange-emitting phosphors is a major challenge in light-emitting diodes. Benefitting from highly condensed framework and abundant cation sites of β-Ca₃(PO₄)₂-type compounds, a novel orange emitter, Sr₁₉Mg₂(PO₄)₁₄:Eu²⁺, has been synthesized and investigated in this study. The structure and coordination environment around each cation were determined by Rietveld refinement for the first time. The optical bandgap was estimated by diffuse reflectance spectrum and the photoluminescence performance was studied systematically. The Sr₁₉Mg₂(PO₄)₁₄:Eu²⁺ phosphor exhibited strong absorption in near-ultraviolet region, and emitted broad-band orange emission from 500 to 750 nm peaked at 620 nm. According to the Rietveld refinement result, photoluminescence and Gaussian fitting spectrum, it could be inferred the emission spectrum of Sr₁₉Mg₂(PO₄)₁₄:Eu²⁺ came from three different Eu²⁺ luminescent centers which could be assigned to the different cation site. The different thermal stability of each luminescent center was also investigated and explained by the different Debye temperature (Θ_D) calculated by average atomic displacement parameter; however, its integrated thermal stability still needs to be improved. All the results indicated Sr₁₉Mg₂(PO₄)₁₄:Eu²⁺ may be applied as an alternative orange phosphor in WLEDs.

在发光二极管中发现近紫外线激发的橙色发光磷光体是一项重大挑战。得益于β- Ca ₃（PO ₄）₂型化合物的高度缩合骨架和丰富的阳离子位点，本研究合成并研究了新型橙色发光体Sr ₁₉ Mg ₂（PO ₄）₁₄：Eu ²⁺。 。Rietveld改进法首次确定了每个阳离子周围的结构和配位环境。通过漫反射光谱估计光学带隙，并系统地研究了光致发光性能。Sr ₁₉毫克₂（PO ₄）₁₄：Eu ²⁺荧光粉在近紫外区域表现出较强的吸收性，并且从500 nm到750 nm发射宽带橙光，峰值波长为620 nm。根据Rietveld精细化结果，光致发光和高斯拟合光谱，可以推断出Sr ₁₉ Mg ₂（PO ₄）₁₄：Eu ²⁺的发射光谱来自三个不同的Eu ²⁺发光中心，可以将它们分配给不同的发光中心。阳离子部位。每个发光中心的不同的热稳定性也进行了研究，并通过不同的德拜温度（Θ解释_d）由平均原子位移参数计算得出；然而，其综合的热稳定性仍需改进。所有表明Sr ₁₉ Mg ₂（PO ₄）₁₄：Eu ^2+的结果均可用作WLED中的橙色荧光粉。