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White Light Emitting CdS Quantum Dot Devices Coated with Layers of Graphene Carbon Quantum Dots

Published online by Cambridge University Press:  02 December 2020

O. Deodanes ,
J. C. Molina ,
C. Violantes ,
D. Pleitez ,
J. Cuadra ,
H. Ponce  and
C. Rudamas
O. Deodanes*
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
J. C. Molina
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
C. Violantes
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
D. Pleitez
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
J. Cuadra
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
H. Ponce
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
C. Rudamas
Affiliation:
Laboratorio de Espectroscopia Óptica, Escuela de Física, Facultad de Ciencias Naturales y Matemática, Universidad de El Salvador, El Salvador.
*
[email protected]
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Abstract

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.

Type
Articles
Information
MRS Advances , Volume 5 , Issue 63: International Materials Research Congress XXIX , 2020 , pp. 3337 - 3343
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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