Band gap tailoring and yellow band emission of Cd0.9?xMnxZn0.1S (x=0 to 0.05) nanoparticles: Influence of Mn concentration |
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| Affiliation: | 1. School of Physical Science and Technology, Southwest Jiaotong University, Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, Chengdu 610031, People''s Republic of China;2. Bond and Band Engineering Group, Sichuan Provincial Key Laboratory (for Universities) of High Pressure Science and Technology, Southwest Jiaotong University, Chengdu 610031, People''s Republic of China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, People''s Republic of China;1. Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamilnadu, India;2. CISL, Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamilnadu, India;1. Thin Film Laboratory, Department of Physics, National Institute of Technology Karnataka, Srinivasnagar, Surathkal, Mangalore-575025, India;2. Department of Physics, NMAM Institute of Technology, NITTE 574110, India;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, PR China;2. College of Science, Southwest Forestry University, Kunming, 650224, PR China |
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| Abstract: | Cd0.9-xMnxZn0.1S nanoparticles with x=0 to 0.05 were prepared by a simple chemical co-precipitation method at room temperature. Crystal structure and optical properties of the synthesized nanoparticles have been analyzed by X-ray diffraction (XRD) and UV–visible spectrophotometer. XRD confirmed the phase singularity of the synthesized material, which also confirmed the formation of Cd–Mn–Zn–S solid solution rather than secondary phase formation. Energy dispersive X-ray spectra showed the presence of Cd, Zn, Mn and S in the synthesized samples. The observed higher absorbance and lower transmittance of Mn-doped Cd0.9Zn0.1S than Cd0.9Zn0.1S is due to the size effect and also the defect states induced by Mn. The decrease in energy gap at Mn=0.01 is due the ‘sp–d’ exchange interactions between band electrons in CdS and the localized ‘d’ electrons of the Mn2+ ions. The increase in energy gap after Mn=0.01 can be explained by the excessive carriers generated by the impurity atoms. Fourier transform infrared spectroscopy (FTIR) illustrated the vibration modes of Cd–Zn–Mn–S between the wave number 530 cm?1 and 780 cm?1. Mn=0.01 doped sample exhibits a relatively high PL intensity and covers most of the visible region than the other samples; so desirable for LED application. The intensity ratio of the green band (GB) to Mn-related yellow band (YB) is decreased after Mn=0.01 which may be due the size effect or reduction of surface defect at higher doping concentrations. |
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| Keywords: | Mn Zn co-doped CdS X-ray diffraction Band gap tailoring Photoluminescence |
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