Electronic and Electrical Engineering College, Zhaoqing University, Zhaoqing, Guangdong, China.
Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan.
Luminescence. 2021 Jun;36(4):995-1005. doi: 10.1002/bio.4028. Epub 2021 Feb 22.
Sr SiO -xEu (x = 0.01, 0.02, 0.035, and 0.05) phosphors were synthesized at 1000-1,300°C for 2 h in two different processes, the solid-state reaction (SSR) method and a two-step (TS) method, and these results revealed three important findings. The secondary Sr SiO phase was observed in 1,300° C-TS-synthesized Sr SiO -xEu powder, but no raw materials or secondary phases were observed in the SSR-prepared Sr SiO -xEu powders. The concentration quenching effect of Eu ions was really observed in TS-prepared Sr SiO -xEu phosphors, which was not observed in SSR-prepared Sr SiO -xEu phosphors. High emission intensity of charge transition state (CT) band was observed in the photoluminescence excitation spectra, for that the 265 and 393 nm were used as the excitation wavelengths of Sr SiO -xEu phosphors. Sr SiO -xEu phosphors under different synthesis processes and excitation wavelengths would have different main emission peaks in the photoluminescence emission spectra. In this study, we also well discussed and explored the relationships of photoluminescence properties with the dipole transitions (electric or magnetic) of Eu ions and the different coordination structures of Sr ions.
SrSiO-xEu（x=0.01、0.02、0.035 和 0.05）荧光粉是通过两种不同的工艺，即固态反应（SSR）法和两步（TS）法，在 1000-1300°C 下合成 2 小时得到的。这些结果揭示了三个重要的发现。在 1300°C-TS 合成的 SrSiO-xEu 粉末中观察到了二级 SrSiO 相，但在 SSR 制备的 SrSiO-xEu 粉末中没有观察到原料或二级相。Eu 离子的浓度猝灭效应在 TS 制备的 SrSiO-xEu 荧光粉中得到了很好的观察，但在 SSR 制备的 SrSiO-xEu 荧光粉中没有观察到。在光致发光激发光谱中观察到了电荷转移态（CT）带的高发射强度，因为 SrSiO-xEu 荧光粉的激发波长为 265nm 和 393nm。在不同的合成工艺和激发波长下，SrSiO-xEu 荧光粉在光致发光发射光谱中会有不同的主要发射峰。在本研究中，我们还深入探讨和研究了荧光性能与 Eu 离子的偶极跃迁（电或磁）以及 Sr 离子的不同配位结构之间的关系。
