White Light Emitting CdS Quantum Dot Devices Coated with Layers of Graphene Carbon Quantum Dots
| Autor: | Hamilton Ponce, O. Deodanes, C. Rudamas, J. Cuadra, C. Violantes, D. Pleitez, J. C. Molina |
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| Rok vydání: | 2020 |
| Předmět: |
Polyester resin
Nanostructure Photoluminescence Materials science 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Crystal chemistry.chemical_compound law General Materials Science Absorption (electromagnetic radiation) chemistry.chemical_classification business.industry Graphene Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Cadmium sulfide 0104 chemical sciences chemistry Mechanics of Materials Quantum dot Optoelectronics 0210 nano-technology business |
| Zdroj: | MRS Advances. 5:3337-3343 |
| ISSN: | 2059-8521 |
| DOI: | 10.1557/adv.2020.436 |
| Popis: | Cadmium sulfide quantum dots (CdS QDs) are semiconductor nanoparticles having sizes in the order of nanometers. They are materials that have outstanding properties for down conversion applications. These nanostructures have been used in the fabrication of white light emitting diodes (WLEDs) in the last years. However, inhomogeneous deposition of CdS QD conversion materials allows unwanted UV light escape. In addition, low efficiency due to strong self-quenching effect, incompatibility between CdS QD solution/crystal polyester resin matrix and reabsorption are common problems that need to be solved. In this work, we try to address the incompatibility between the CdS QD solution/crystal polyester resin matrix by using a solvent exchange procedure. To block the unwanted UV-light escape, we coated our devices with a mixture of graphene carbon quantum dot (GCQD) solution/crystal polyester resin matrix. The QDs and the WLED prototypes were characterized by absorption and photoluminescence (PL) spectroscopy. The QDs embedded in the matrix shown a good homogeneous dispersion. On the other hand, the mixture shown a rapid solidification. These facts indicate a good compatibility between the CdS QDs and the crystal polyester resin. We also observed a considerable reduction of unwanted near UV-light. White light emission from WLED devices with common crystal polyester resin and low-cost materials has been achieved. |
| Databáze: | OpenAIRE |
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