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Optical properties and energy transfer mechanism of Eu3+, Ce3+ doped and co-doped ZnS quantum dots

2021; Elsevier BV; Volume: 236; Linguagem: Inglês

10.1016/j.jlumin.2021.118106

1872-7883

Chin-Fen Tuan, V. H. Yen, K.C. Cuong, Nguyễn Thị Thủy, Pham Mai An, Ngô Tuấn Ngọc, Đỗ Thị Huế, A. Xayyadeth, Yuxin Peng, Ngoc-Chung Le, Nguyen Thi Khanh Van, L.T. Ha, Nguyễn Trung Kiên, Chu Viet Ha,

Nanocluster Synthesis and Applications

Semiconductor ZnS quantum dots (QDs) co-doped with Eu3+ and Ce3+ were synthesized by the chemical method. The optical properties of the samples were characterized by absorption spectroscopy, photoluminescence (PL) spectroscopy and PL-decay lifetime. X-ray diffraction revealed that the QDs had a zincblende structure and a particle size of about 3 nm. The presence of Eu3+ and Ce3+ ions in the samples were proved by X-ray photoelectron spectroscopy. The properties of ligand field and the intensity parameters of Eu3+ doped ZnS QDs were analyzed by Judd-Ofelt theory. For Ce3+ and Eu3+ ions co-doped in ZnS QDs, the luminescence intensity and lifetime of the 5d1 (Ce3+) level decrease while the emission intensity of Eu3+ ion increases with the increasing Eu3+concentration. The reduced lifetime and the luminescence quenching of the 5d1 (Ce3+) level are due to the energy transfer from Ce3+ to Eu3+ ion. The efficiency of the energy transfer process from Ce3+ ions to Eu3+ ions and the nature of this interaction mechanism were determined by applying Reisfeld and Inokuti-Hirayama models.