Design of Distributed Bragg Reflectors for Green Light-Emitting Devices Based on Quantum Dots as Emission Layer

Iman E. Shaaban, Ahmed S. Samra, Shabbir Muhammad and Swelm Wageh
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Iman E. Shaaban: Electronics and Communications Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt
Ahmed S. Samra: Electronics and Communications Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt
Shabbir Muhammad: Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
Swelm Wageh: Department of Physics, Faculty of Science, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia

Energies, 2022, vol. 15, issue 3, 1-17

Abstract: Light-emitting diodes based on quantum dots as an active emission can be considered as a promising next generation for application in displays and lighting. We report a theoretical investigation of green emission at 550 nm of microcavity inorganic–organic light-emitting devices based on Zn (Te, Se) alloy quantum dots as an active layer. Distributed Bragg Reflector (DBR) has been applied as a bottom mirror. The realization of high-quality DBR consisting of both high and low refractive index structures is investigated. The structures applied for high refractive index layers are (ZrO 2 , SiN x , ZnS), while those applied for low index layers are (Zr, SiO 2 , CaF 2 ). DBR of ZnS/CaF 2 consisting of three pairs with a high refractive index step of ( Δ n = 0.95) revealed a broad stop bandwidth (178 nm) and achieved a high reflectivity of 0.914.

Keywords: Zn (Te, Se) alloy quantum dot; organic light-emitting devices; green emission; distributed Bragg reflector (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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