Pristine and Mn2+-Activated (Zn,Cd)S Nanoparticles: Synthesis, Microstructure and Photoluminescent Properties

Li-Yu  Lin; Teng-Ming Chen

doi:10.6180/jase.2002.5.3.07

Pristine and Mn2+-Activated (Zn,Cd)S Nanoparticles: Synthesis, Microstructure and Photoluminescent Properties

Li-Yu Lin¹ and Teng-Ming Chen This email address is being protected from spambots. You need JavaScript enabled to view it.¹

¹Department of Applied Chemistry National Chiao Tung University Hsinchu, Taiwan 300, R.O.C.

Received: July 30, 2002
Accepted: August 20, 2002
Publication Date: September 1, 2002

Download Citation: ||https://doi.org/10.6180/jase.2002.5.3.07

ABSTRACT

Nanoparticles of pristine and Mn²⁺-activated (Zn_1-xCd_x)S (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) have been synthesized via a simple chemical colloid route. The size of as-prepared (Zn,Cd)S or (Zn,Cd)S:Mn²⁺ nanoparticles was determined to be ca. 5-10 nm in diameter with a narrow size distribution, as indicated by bright-field TEM imaging investigations. With increasing x the X-ray diffraction (XRD) peaks were found to be broadened with their intensity weakened and the corresponding diffraction angles were observed to shift toward lower 2θ for nanocrystalline (Zn_1-xCd_x)S:Mn²⁺ and (Zn_1-xCd_x)S phases. The λex was fount to exhibit a blue shift from 362 to 325 nm and λem was observed to exhibit also a blue shift from 460 to 425 nm, as indicated by the comparison of PLE and PL spectra for the nanocrystalline and bulk (Zn,Cd)S phases. In the nanocrystalline (Zn1-xCdx)S:Mn2+ phases the absorption of (Zn,Cd)S dominates and no absorption due to Mn²⁺ was observed, as indicated by the PLE spectra. On the other hand, the emission of Mn2+ dominates and λem was observed to exhibit a blue shift from 596 nm to 584 nm with x increasing from 0 to 0.8, as indicated by the PL spectra for (Zn_1-xCd_x)S:Mn²⁺ phases. The effect of synthetic routes on the PLE and PL spectra and the fluorescence decay life time for ZnS:Mn²⁺ has also been investigated and reported.

Keywords: Nanoparticles, (Zn,Cd)S:Mn2+, Photoluminescence, Chemical Colloid Synthesis, Solvothermal Synthesis, TEM and SEM Imaging

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