The core-shell structural and optical stability of SiNWs:Ce3+@SiO2

• Published in: Optik (Stuttgart) Vol. 218; p. 164956
• Main Authors: Fan, Z.D., Geng, X.P., Wang, F., Wang, Y.X., Yang, H.M., Yang, R.C., Gao, Q.N., Hao, C.Y.
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.09.2020
• Subjects: Core-shell structure; Fluorescent nanomaterials; Optical stability; Optical stability; Fluorescent nanomaterials; Core-shell structure
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2020.164956

Based on high temperature solid-state method, SiNWs:Ce3+@SiO2 core-shell fluorescent nanomaterials are prepared, CeO2 powders are used as rare earth dopant under doping temperature 1200 ℃, and N2 gas flow rate is 1000 sccm and doping time is 60 min. The morphology, structure, composition and distribution of elements as well as the luminescent properties and stability of the material are tested and characterized by transmission electron microscopy, X-ray energy spectrum elemental image analysis technology and fluorescence spectrophotometer. The results show that there are a large number of SiO2 with thickness of 5−30 nm coating rare earth nanoparticles on Si nanowires (SiNWs) surface. At room temperature, SiNWs:Ce3+@SiO2 has a strong blue luminescence with the emission peak at 405 nm(5D→2F5/2) and the full width at half maxim (FWHM) of 36.7 nm. The fluorescence quantum efficiency is 90.57%. They have good properties such as temperature, acid and alkali and anti-light bleaching stability.