Abstract A red luminescent YxAl6-xSi2O13:Eu,Bi nanophosphor was successfully synthesized by a rapid, energy-saving microwave-assisted synthesis. This method significantly reduced synthetic time and energy consumption over previous reports using traditional solid-state methods. The results revealed that the single phase of Al6Si2O13 (mullite) nanocrystals had spherical shapes of 30–60 nm diameters. In addition, the influences of Y3+ and Bi3+ ions on photoluminescent properties of Al6Si2O13:Eu3+ were observed. The emission intensity was improved drastically through dopants of Y3+ and Bi3+ ions and increased up to 2.1-fold, compared to that of undoped Al6Si2O13:Eu3+. The internal quantum efficiency of Y0.15Al5.85Si2O13:0.08Eu3+,0.05Bi3+ phosphor was 72% under an excitation wavelength of 395 nm. These results were attributed to flux effects of Y3+ ions and Y3+ doping reduced opportunities for energy transfer (ET) between Bi3+ ions and enhanced the Forster resonance ET from Bi3+ → Eu3+. The Judd-Ofelt theory was employed to discuss the local site symmetry around Eu3+ ions in Y3+-doped hosts. The optimal nanophosphor of Y0.15Al5.85Si2O13:0.08Eu3+,0.05Bi3+ was excited at 395 nm and monitored at 612 nm, from which the Commission International de I'Eclairage color coordinates of Y0.15Al5.85Si2O13:0.08Eu3+, 0.05Bi3+ phosphor was estimated to be x = 0.61 and y = 0.36 in the deep red region. The obtained phosphor could be expected to find application as a near-ultraviolet convertible phosphor for white light-emitting diodes.

中文翻译：

---

通过节能微波辅助合成获得的 Y 和 Bi 共掺杂 Al6Si2O13:Eu 红色纳米荧光粉的发光特性和 Förster 共振能量转移

摘要 采用快速、节能的微波辅助合成方法，成功合成了一种红色发光的YxAl6-xSi2O13:Eu,Bi纳米荧光粉。与之前使用传统固态方法的报告相比，这种方法显着减少了合成时间和能耗。结果表明，Al6Si2O13（莫来石）纳米晶体的单相具有直径为 30-60 nm 的球形。此外，还观察了Y3+和Bi3+离子对Al6Si2O13:Eu3+光致发光性能的影响。与未掺杂的 Al6Si2O13:Eu3+ 相比，通过 Y3+ 和 Bi3+ 离子掺杂剂，发射强度显着提高，增加了 2.1 倍。Y0.15Al5.85Si2O13:0.08Eu3+,0.05Bi3+荧光粉在395nm激发波长下的内量子效率为72%。这些结果归因于 Y3+ 离子和 Y3+ 掺杂的通量效应减少了 Bi3+ 离子之间能量转移 (ET) 的机会，并增强了 Bi3+ → Eu3+ 的 Forster 共振 ET。Judd-Ofelt 理论被用来讨论 Y3+ 掺杂主体中 Eu3+ 离子周围的局部位置对称性。Y0.15Al5.85Si2O13:0.08Eu3+,0.05Bi3+的最佳纳米磷光体在395 nm激发并在612 nm处监测，其中Y0.15Al5.85Si2O13+,Bi305.85Si2O13+,Bi+305.85Si2O13+,Bi303+,Bi303+,Bi303+,Bi303+,Bi303+,0.08Eu3+在深红色区域估计为 x = 0.61 和 y = 0.36。所获得的荧光粉有望用作白光发光二极管的近紫外可转换荧光粉。