Developing red phosphors for LEDs is highly demanded yet challenging. Herein, a novel Eu²⁺-activated orange-red phosphors Sr_3-xAl₂Si₃O₁₂:xEu²⁺ (SASO:xEu²⁺) (0 ≤ x ≤ 0.08, ∆x = 0.01) were successfully prepared by high-temperature solid-phase reaction. The phosphors all belong to the cubic crystal system, and the space group is Fm-3 m(225). Phosphors SASO:xEu²⁺ can be efficiently excited by wavelengths in the range of 420–500 nm and produces strong orange-red light emission at 618 nm. In phosphors SASO:xEu²⁺, the optimal doping concentration of Eu²⁺ is 0.06, and the Inokuti–Hirayama (I-H) model shows that the energy transfer between Eu²⁺ ions is mainly due to the dipole-dipole (d-d) interaction. The phosphors SASO:xEu²⁺ have excellent thermal stability, the fluorescence intensity of phosphor SASO:0.06Eu²⁺ at 418 K still maintains 69.57 % of the fluorescence intensity at room temperature. Phosphor SASO:0.06Eu²⁺ has a high luminescence quality with a color purity of 86.5 %, which exhibits bright orange-red emission under 450 nm illumination.

开发用于 LED 的红色荧光粉需求量很大，但也充满挑战。在此，成功地获得了一种新型Eu ²⁺激活的橙红色荧光粉Sr _{3- x} Al ₂ Si ₃ O ₁₂ : x Eu ²⁺ (SASO: x Eu ²⁺ ) (0 ≤  x  ≤ 0.08, ∆ x  = 0.01)通过高温固相反应制备。荧光粉均属于立方晶系，空间群为Fm-3 m(225)。荧光粉 SASO: x Eu ²⁺可以被 420-500 nm 范围内的波长有效激发，并在 618 nm 处产生强烈的橙红色光发射。在SASO: x Eu ^{2+荧光粉中，Eu 2+}的最佳掺杂浓度为0.06，Inokuti-Hirayama (IH)模型表明Eu ²⁺离子之间的能量转移主要是由于偶极-偶极(dd)相互作用。SASO: x Eu ²⁺荧光粉具有优异的热稳定性，SASO:0.06Eu ²⁺荧光粉在418 K时的荧光强度仍保持室温下荧光强度的69.57%。荧光粉SASO:0.06Eu ²⁺发光质量高，色纯度86.5%，在450nm光照下呈现明亮的橙红色发光。