Abstract Novel single-phased phosphors SrY2O4:Bi3+,Eu3+ (SYO:Bi3+,Eu3+) with tunable emitting were successfully synthesized by the conventional solid-state method. X-ray diffraction, excitation and emission spectra, decay curves as well as temperature-dependent luminescence were applied to characterize the as-obtained phosphors. Under ultraviolet (UV) excitation, blue luminescence centered at 410 nm was found in SYO:Bi3+. By introducing Eu3+ into SYO:Bi3+, highly efficient energy transfer (ET) process with ET efficiency of 92.65% from Bi3+ to Eu3+ was obtained before concentration quenching. The possible ET mechanism from Bi3+ to Eu3+ were investigated systematically. By altering Eu3+ content, tunable emission from blue to red was realized. More importantly, investigation of the thermal stability showed that over 98% of the room-temperature emission intensity was still preserved at 155 °C, which is superior to that of most recently reported Bi3+,Eu3+ co-doped phosphors. These results indicate that this kind of easy fabrication, low-cost and highly stable SYO:Bi3+,Eu3+ are potential candidates for blue-red phosphors for application in UV chip based w-LEDs.

中文翻译：

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在用于 UV-LED 的单相 SrY 2 O 4 :Bi 3+ ,Eu 3+ 荧光粉中具有优异热稳定性的可调发射

摘要 采用常规固态方法成功合成了具有可调发光的新型单相荧光粉SrY2O4:Bi3+,Eu3+ (SYO:Bi3+,Eu3+)。X 射线衍射、激发和发射光谱、衰减曲线以及随温度变化的发光被应用于表征所获得的磷光体。在紫外 (UV) 激发下，在 SYO:Bi3+ 中发现了以 410 nm 为中心的蓝色发光。通过将 Eu3+ 引入 SYO:Bi3+ 中，在浓缩淬火之前获得了从 Bi3+ 到 Eu3+ 的高效能量转移（ET）过程，ET 效率为 92.65%。系统地研究了从 Bi3+ 到 Eu3+ 的可能的 ET 机制。通过改变 Eu3+ 含量，实现了从蓝色到红色的可调发射。更重要的是，热稳定性研究表明，在 155°C 时仍保持超过 98% 的室温发射强度，这优于最近报道的 Bi3+、Eu3+ 共掺杂荧光粉。这些结果表明，这种易于制造、低成本和高度稳定的 SYO:Bi3+,Eu3+ 是用于基于 UV 芯片的 w-LED 的蓝红色荧光粉的潜在候选者。