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 (ZrO2, SiNx, ZnS), while those applied for low index layers are (Zr, SiO2, CaF2). DBR of ZnS/CaF2 consisting of three pairs with a high refractive index step of (Δn = 0.95) revealed a broad stop bandwidth (178 nm) and achieved a high reflectivity of 0.914.
Highlights
Quantum dots (QDs) have a unique property that originates almost individually due to the size regime in which they exist
This paper demonstrates the realization of bottom green emission of QD-organic light emitting devices (QD-OLED) by using Distributed Bragg Reflector (DBR) as an optical reflector
This study focuses on the use of a DBR as a bottom mirror; three DBRs labeled
Summary
Quantum dots (QDs) have a unique property that originates almost individually due to the size regime in which they exist. The green emission of Zn (Te1−x Sex ) QDs can be realized by controlling their particle size and composition [3] It is worth mentioning the importance of semiconductor nanocrystals generated from their unique size-dependent optical and electrical properties, which can be utilized in constructing optoelectronic devices [9]. The utilization of high-purity dielectric material leads to the production of highly efficient DBR mirrors It suppresses absorption and controls the thickness of layers during fabrication, leading to obtaining the desired reflection wavelength [14]. DBRs have been used as a bottom mirror for light-emitting devices based on organic and inorganic QD structures with green emission to investigate their microcavity effects on device performance. According to the energylevel diagram, the emission zone is confined to the QD layer due to good energy-level alignments at interfaces of adjacent layers
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