A highly efficient white quantum dot light-emitting diode employing magnesium doped zinc oxide as the electron transport layer based on bilayered quantum dot layers

Abstract

A highly efficient QLED achieving white emission at a low driving voltage is obtained by employing Zn0.95Mg0.05O as the electron transport layer.

Zinc oxide light-emitting diodes: a review

“…Magnesium-doped ZnO quantum dots have also been used as the electron transport layer in a layered LED made completely out of functional quantum dot layers. 172 Very recently, a CdSe/CdS/ZnS quantum dot LED has also been reported with a sol-gelsynthesized ZnO film as a highly conductive electron transport layer. 173 The use of ZnO quantum dots for making LEDs is an interesting development.…”

Recent progress in the device architecture of white quantum-dot light-emitting diodes

“…Copyright 2018, Royal Society of Chemistry. (f) Device structure of the B/Y-QD-bilayered WQLEDs [38]. Reprinted with permission from ref.…”

“…The emission color of the presented WQLEDs was still unstable as the driving voltage was changed (Figure 3(e)), which was mainly caused by the migration of the exciton recombination zone. Recently, Chen et al reported conventional WQLEDs with a Y/B QD bilayered EML and with a higher CE of 24.6 cd/A (Figure 3(f)) [38]. In this device, the same ZnO nanoparticles were employed as a buffer layer to prevent the under-QD layer from being damaged by the solvent of the upper QDs.…”

Hierarchical core–shell heterostructure of H2O-oxidized ZnO nanorod@Mg-doped ZnO nanoparticle for solar cell applications

“…1 It is an n-type II-IV semiconductor possessing a wide band gap (3.37 eV) and large exciton binding energy (60 meV). 2 These valuable properties make ZnO an excellent candidate for optoelectronic applications including solar cells, [3][4][5][6][7] transparent conducting oxides (TCO), [8][9][10] light emitting diodes (LEDs), [11][12][13] ultraviolet (UV) lasers, 14,15 and photodetectors. 16,17 More specifically for solar cells, nanostructured ZnO can serve as an electron-transporting layer (ETL) or transparent conductive electrode (TCO) owing to its inherent high electron mobility and high conductivity.…”