OAM-RC

Abstract

Using silicon nanowires as the groundmass of fluorescent nanomaterials, a series of Si nanowires co-doped with Y 3+ and Eu3+ were prepared by high temperature method. The prepared fluorescent nanomaterials were characterized and analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL). The results show that when the optimal excitation wavelength is 293 nm, the Y 3+，Eu3+ co-doped silicon nanowires have strong red emission, which is mainly characterized by a peak at 619 nm (5D0→ 7 F2). At the same time, four emission bands of 576 nm ( 5D0→ 7 F0), 596 nm ( 5D0→7F1), 658 nm ( 5D0→ 7 F3) and 708 nm ( 5D0→ 7 F4) were observed. When the molar ratio of Y 3+:Eu3+ is 2.5%, the emission intensity of Eu3+ red light is 110% higher than the case of no Y 3+ doped. Analysis shows that Eu3+ occupies two positions of Y3+:C2 and S6. The lack of reversal symmetry is conducive to the electric dipole transition, so the transition 5D0→ 7 F2 is enhanced. Furthermore, the full width at half maximum of red emission peak at 619 nm has been reduced from 10.2 nm to 7.2 nm, therefore the sensitivity and resolution of fluorescence detection is improved.

Keywords

Photoluminescence, Eu3+,Y3+ co-doped, Si nanowires.

Citation

R. C. YANG, Z. D. FAN, X. P. GENG, G. L. WANG, F. WANG, Preparation and photoluminescence properties of Eu 3+ , Y 3+ co-doped Si nanowires, Optoelectronics and Advanced Materials - Rapid Communications, 16, 1-2, January-February 2022, pp.74-78 (2022).

Submitted at: May 29, 2018

Accepted at: Feb. 10, 2022