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Synthesis of ZnCdS Luminescent Nanoparticles for Hybrid Light Emitting Diode

Alehdaghi, Hassan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40892 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima; Irajizad, Azam
  7. Abstract:
  8. In recent decade energy crisis causes research on luminescent devises gains special importance. Particularly, hybrid LEDs (organic- nanocrystal) have been studied by a number of researches due to their advantages. Easy fabrication and narrow spectrum of radiation are mentioned as the most important benefits. The emissive layer is the most important part in these diodes which made of semiconductor nanoparticles. There are a variety of chemical methods for synthesis of semiconductor nanoparticles. We focus on aqueous method for nanoparticles synthesis because of its advantages. Alloyed semiconductor nanoparticles of ZnxCd1-xS were selected for this research work. The manifest features of the alloyed semiconductor nanoparticles are band gap variation and shift in luminescent peak according to X. Desired nanoparicles were synthesis by three chemical methods: growth in room temperature, thermochemical and microwave. thioglycerol (TG) and thioglycolic acid (TGA) were used as capping agent in all chemical methods. Different studies with light transmission spectra, photoluminescence and XRD illustrated that alloyed nanoparticles with TG were synthesis while it were not success for nanoparticles with TGA capping agent. In the second step, obtained nanoparticles were used for fabrication of hybrid light emitting diodes. Resulting diode involved three layers which deposited on an ITO substrate by spin coating method. Finally a aluminum layer deposited as cathode by thermal evaporation method. Final diodes fabricated from ZnxCd1-xS with X≠0 did not showed remarkable luminescent. However, those fabricated from nanoparticles with X=0 showed luminescent.
  9. Keywords:
  10. Nanoparticles ; Thioglycolic Acid (TGA) ; Zinc Cadmium Sulfide Nanoparticles ; Thioglycerol (TG)

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