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Enhancement of white light generation from CdSe/ZnS core – shell system by adding organic pyrene molecules |
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PP: 49-58 |
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Author(s) |
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H. I. Murad,
A. M. Suhail,
A. Ibrahim,
Q. G. Al-zaidi,
A. M. Kadim,
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Abstract |
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| The composite CdSe/ZnS core – shell mixed with pyrene molecules in polymethyl meth-acrylate (PMMA) polymer was used to generate intense white light when illuminated by InGaN/GaN UV LED. The addition of pyrene molecules in low concentration to the core – shell system tuned the chromaticity coordinates to (0.25, 0.34) and increased the intensity of the emit-ted white light. This improvement was attributed to the overlap of pyreneexcimer emission with the absorption spectrum of CdSe/ZnS core – shell which leads to a cold white light generation. The synthesis of core – shell nanoparticles, with the pyrene molecules in PMMA films, is pre-sented. The photoluminescence spectra of the pyrene, CdSe/ZnS core – shell and their mixture composite in PMMA were tested. The Gaussian fit was used to determine the chromaticity coor-dinate of the emitted white light. |
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