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Annealing Time-Dependent Structural and Optical Properties of Znse Nanoparticles

Bui Thi Thu Hien,Nguyen Thu Loan,Pham Thi Thuy,Tran Thi Kim Chi

In this paper, ZnSe nanoparticles (NCs) have been successfully prepared via hydrothermal method using selenium and zinc powder as precursors at 190°C for different annealing times (5÷30 hour). The influence of annealing time on the structure and optical properties of ZnSe NCs was investigated by using X-Ray diffraction (XRD), Raman spectroscopy, high resolution transmission electron microscopy (HRTEM), and absorption/photoluminescence spectroscopies. The results showed that the size and luminescence efficiency of the ZnSe NCs was increased with annealing time. The obtained ZnSe NCs with high crystal quality and luminescence efficiency emit 470 nm blue light with a full width at half maximum (FWHM) of about 16 nm, which suggests that they are promising candidates for potential applications in solid-state lighting.