γ-aluminum oxynitride (γ-AlON) with spinel structure has attracted much attention for structural and functional application. γ-AlON powders were successfully prepared by direct nitridation method of Al/Al(OH)3 starting mixture in ammonia and then calcined at high temperature. XRD, SEM, TEM, EDX, and photoluminescence were conducted to investigate the detail procedure and the optical properties of AlON: xEu phosphors. Nitrogen was introduced by the nitridation of metallic aluminum, appropriate Al amount and nitridation condition was necessary to obtain phase pure γ-AlON. The as-prepared AlON powders exhibited multifaceted grain morphology with fine particle size (1-5 μm). Eu2O3 activator was reduced and transformed to EuAl12O19 by reaction with alumina, which remained in the product when x > 0.25%. Under 331 nm excitation, AlON: xEu phosphors exhibited emission bands of 475 and 410 nm. 475 nm band reached a plateau at x = 0.25% due to the solubility of Eu2+ ion in AlON, whereas 410 nm band showed a linear increase in intensity with Eu2+ doping amount, which was believed to be the contribution of EuAl12O19. The present approach combination of direct nitridation in ammonia and postcalcination process showed potential application for AlON ceramic and AlON phosphors.

中文翻译：

---

氨中直接氮化和后退火制备掺Eu的γ-铝氧氮化物荧光粉

具有尖晶石结构的γ-氮氧化铝（γ-AlON）在结构和功能应用方面备受关注。采用Al/Al(OH)3起始混合物在氨中直接氮化然后高温煅烧的方法成功制备了γ-AlON粉末。进行 XRD、SEM、TEM、EDX 和光致发光以研究 AlON: xEu 荧光粉的详细过程和光学性质。通过金属铝的氮化引入氮，需要适当的铝量和氮化条件才能获得相纯的γ-AlON。所制备的 AlON 粉末表现出多面的晶粒形态，具有细粒度 (1-5 μm)。通过与氧化铝反应，Eu2O3 活化剂被还原并转化为 EuAl12O19，当 x > 0.25% 时，它保留在产品中。在 331 nm 激发下，AlON：xEu 磷光体显示出 475 和 410 nm 的发射带。由于 Eu2+ 离子在 AlON 中的溶解度，475 nm 波段在 x = 0.25% 处达到平台，而 410 nm 波段显示强度随 Eu2+ 掺杂量线性增加，这被认为是 EuAl12O19 的贡献。目前在氨中直接氮化和后煅烧工艺相结合的方法显示了 AlON 陶瓷和 AlON 荧光粉的潜在应用。