FABRICATION, STUDY OF OPTICAL PROPERTIES AND ENERGY TRANSFER PROCESS OF Eu3+ ION- DOPED CdSSe TERNARY SEMICONDUCTOR NANOCRYSTALS

Nguyễn Xuân Ca; Nguyễn Thị Hiền; Vũ Xuân Hòa; Nguyễn Trung Kiên; Nguyễn Thị Minh Thủy; Nguyễn Thanh Tùng; Phạm Thị Ngọc Dung; Phạm Minh Tân

doi:10.34238/tnu-jst.6385

FABRICATION, STUDY OF OPTICAL PROPERTIES AND ENERGY TRANSFER PROCESS OF Eu3+ ION- DOPED CdSSe TERNARY SEMICONDUCTOR NANOCRYSTALS

About this article

Received: 22/08/22 Revised: 31/08/22 Published: 31/08/22

Authors

1. Nguyen Xuan Ca, TNU - University of Sciences
2. Nguyen Thi Hien, TNU - University of Sciences
3. Vu Xuan Hoa, TNU - University of Sciences
4. Nguyen Trung Kien, TNU - University of Sciences
5. Nguyen Thi Minh Thuy, TNU - University of Education
6. Nguyen Thanh Tung, TNU - University of Technology
7. Pham Thi Ngoc Dung, TNU - University of Technology
8. Pham Minh Tan , TNU - University of Technology

Abstract

CdS_0.5Se_0.5 (CdSSe) ternary nanocrystals (NCs) doped with the rare earth Eu³⁺ions have been successfully fabricated by wet chemical method in ODE solvent. The shape and structure of the NCs were investigated by using transmission electron microscopy (TEM) and X-ray diffraction (XRD) measurements. The optical properties of the NCs were investigated through excitation spectroscopy, fluorescence and fluorescence lifetime. The emission spectra of the Eu³⁺ ion doped CdSSe NCs show five emission peaks at 507 nm, 588 nm, 620 nm, 652 nm and 699 nm, corresponding to the excitonic emission of the CdSSe host, and the ⁵D₀ -⁷F_1,⁵D₀ -⁷F_2,⁵D₀ -⁷F₃ and ⁵D₀ -⁷F₄ transitions of Eu³⁺ ion. The energy transfer processes from CdSSe host to Eu³⁺ ions and between the Eu³⁺ions have been studied and explained in detail. CdSSe NCs doped with Eu³⁺ ions have a much longer lifetime than undoped CdSSe NCs, they have many potential applications in the fields of photovoltaics, photocatalysis and biomarkers.

Keywords

CdSSe; Nanocrystals; Optical properties; Rare earths; Energy transfer

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DOI: https://doi.org/10.34238/tnu-jst.6385

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