Origin of Enhanced Efficiency and Stability in Diblock Copolymer-Grafted Cd-Free Quantum Dot-Based Light-Emitting Diodes

2021 ◽  
Author(s):  
Yeseul Park ◽  
Benjamin Klöckner ◽  
Donghyo Hahm ◽  
Jaehoon Kim ◽  
Taesoo Lee ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Diblock Copolymer ◽  
Light Emitting Diodes ◽  
Charge Balance ◽  
Electron Hole ◽  
Light Emitting ◽  
Hole Charge ◽  
Operational Lifetime

The efficiency and operational lifetime of quantum dot (QD) based light-emitting diodes (QLEDs) are essentially affected by the electron–hole charge balance. Although various methods have been reported to improve the...

Remarkable lifetime improvement of quantum-dot light emitting diodes by incorporating rubidium carbonate in metal-oxide electron transport layers

2019 ◽  
Vol 7 (32) ◽  
pp. 10082-10091 ◽  
Author(s):  
Yujin Lee ◽  
Hyo-Min Kim ◽  
Jeonggi Kim ◽  
Jin Jang
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Metal Oxide ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Remarkable Improvement ◽  
Operational Lifetime ◽  
Electron Transporting Layer ◽  
Doped Zno ◽  
Mg Doped

We demonstrated the remarkable improvement of efficiency roll-off and operational lifetime in red quantum dot light emitting diodes (R-QLEDs) by incorporating rubidium carbonate (Rb2CO3) in Mg doped ZnO (MZO) electron transporting layer (ETL).

Controlling charge balance using non-conjugated polymer interlayer in quantum dot light-emitting diodes

2017 ◽  
Vol 50 ◽  
pp. 82-86 ◽  
Author(s):  
Jinyoung Yun ◽  
Jaeyun Kim ◽  
Ho-Kyun Jang ◽  
Kook Jin Lee ◽  
Jung Hwa Seo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Conjugated Polymer ◽  
Light Emitting Diodes ◽  
Charge Balance ◽  
Light Emitting

scholarly journals Enhancing the performance of blue quantum-dot light-emitting diodes through the incorporation of polyethylene glycol to passivate ZnO as an electron transport layer

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 23121-23127 ◽  
Author(s):  
Jun-hao Sun ◽  
Jia-hui Huang ◽  
Xu-yan Lan ◽  
Feng-chun Zhang ◽  
Ling-zhi Zhao ◽  
...  
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Zno Nanoparticles ◽  
Surface Defect ◽  
Light Emitting Diodes ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Charge Balance ◽  
Defect States ◽  
Light Emitting

Highly efficient blue quantum-dot light-emitting diodes have been realized by blending PEG into ZnO nanoparticles as an electron transport layer due to regulating charge balance and passivating the surface defect states of ZnO nanoparticles.

scholarly journals Interlayer doping with p-type dopant for charge balance in indium phosphide (InP)-based quantum dot light-emitting diodes

2019 ◽  
Vol 27 (16) ◽  
pp. A1287 ◽  
Author(s):  
Hyejin Kim ◽  
Woosuk Lee ◽  
Hyungsuk Moon ◽  
Sun Jung Kim ◽  
Ho Kyoon Chung ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Indium Phosphide ◽  
Light Emitting Diodes ◽  
Charge Balance ◽  
Light Emitting ◽  
P Type

scholarly journals Effects of UV Irradiation and Storage on the Performance of Inverted Red Quantum-Dot Light-Emitting Diodes

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1606
Author(s):  
Yu Luo ◽  
Junjie Wang ◽  
Pu Wang ◽  
Chaohuang Mai ◽  
Jian Wang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Uv Irradiation ◽  
Power Efficiency ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Storage Period ◽  
Charge Balance ◽  
Light Emitting ◽  
Practical Applications ◽  
And Storage

We report the effects of ultraviolet (UV) irradiation and storage on the performance of ZnO-based inverted quantum-dot light-emitting diodes (QLEDs). The effects of UV irradiation on the electrical properties of ZnO nanoparticles (NPs) were investigated. We demonstrate that the charge balance was enhanced by improving the electron injection. The maximum external quantum efficiency (EQE) and power efficiency (PE) of QLEDs were increased by 26% and 143% after UV irradiation for 15 min. In addition, we investigated the storage stabilities of the inverted QLEDs. During the storage period, the electron current from ZnO gradually decreased, causing a reduction in the device current. However, the QLEDs demonstrated improvements in maximum EQE by 20.7% after two days of storage. Our analysis indicates that the suppression of exciton quenching at the interface of ZnO and quantum dots (QDs) during the storage period could result in the enhancement of EQE. This study provides a comprehension of the generally neglected factors, which could be conducive to the realization of high-efficiency and highly storage-stable practical applications.

Improved Charge Balance of Quantum Dot Light-Emitting Diodes via Spiro-OMeTAD Electron Blocking Layer

2019 ◽  
Vol 39 (5) ◽  
pp. 0523003
Author(s):  
张文静 Zhang Wenjing ◽  
张芹 Zhang Qin ◽  
杨亮 Yang Liang ◽  
江莹 Jiang Ying ◽  
常春 Chang Chun ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Blocking Layer ◽  
Charge Balance ◽  
Electron Blocking Layer ◽  
Light Emitting
Sign in / Sign up

Export Citation Format

Share Document