Improved Efficiency and Enhanced Color Quality of Light-Emitting Diodes with Quantum Dot and Organic Hybrid Tandem Structure

2016 ◽  
Vol 8 (40) ◽  
pp. 26982-26988 ◽  
Author(s):  
Heng Zhang ◽  
Yuanxiang Feng ◽  
Shuming Chen
Keyword(s):  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Hybrid ◽  
Color Quality ◽  
Tandem Structure

Excellent Color Quality of White-Light-Emitting Diodes by Embedding Quantum Dots in Polymers Material

2016 ◽  
Vol 22 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Huang-Yu Lin ◽  
Sheng-Wen Wang ◽  
Chien-Chung Lin ◽  
Kuo-Ju Chen ◽  
Hau-Vei Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Quality ◽  
White Light Emitting Diodes ◽  
Excellent Color

scholarly journals Sequential Improvement from Cosolvents Ink Formulation to Vacuum Annealing for Ink-Jet Printed Quantum-Dot Light-Emitting Diodes

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4754
Author(s):  
Young Joon Han ◽  
Do Yeob Kim ◽  
Kunsik An ◽  
Kyung-Tae Kang ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Vacuum Annealing ◽  
Device Performance ◽  
Ohnesorge Number ◽  
Emission Layer ◽  
Light Emitting ◽  
Ink Jet ◽  
Jet Printing

Optimization of ink-jet printing conditions of quantum-dot (QD) ink by cosolvent process and improvement of quantum-dot light-emitting diodes (QLEDs) characteristics assisted by vacuum annealing were analyzed in this research. A cosolvent process of hexane and ortho-dichlorobenzene (oDCB) was optimized at the ratio of 1:2, and ink-jetting properties were analyzed using the Ohnesorge number based on the parameters of viscosity and surface tension. However, we found that these cosolvents systems cause an increase in the boiling point and a decrease in the vapor pressure, which influence the annealing characteristics of the QD emission layer (EML). Therefore, we investigated QLEDs’ performance depending on the annealing condition for ink-jet printed QD EML prepared using cosolvents systems of hexane and oDCB. We enhanced the quality of QD EML and device performance of QLEDs by a vacuum annealing process, which was used to prevent exposure to moisture and oxygen and to promote effective evaporation of solvent in QD EML. As a result, the characteristics of QLEDs formed using ink-jet printed QD EML annealed under vacuum environment increased luminescence (L), current efficiency (CE), external quantum efficiency (EQE), and lifetime (LT50) by 30.51%, 33.7%, 21.70%, and 181.97%, respectively, compared to QLEDs annealed under air environment.

An ZnMgO:PVP inorganic–organic hybrid electron transport layer: towards efficient bottom-emission and transparent quantum dot light-emitting diodes

2019 ◽  
Vol 7 (8) ◽  
pp. 2291-2298 ◽  
Author(s):  
Heng Zhang ◽  
Shuming Chen
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Light Emitting ◽  
Organic Hybrid

Efficient bottom-emission and transparent quantum-dot light-emitting diodes (QLEDs) have been demonstrated by using an ZnMgO:PVP hybrid electron transport layer.

Quantum-Dot and Organic Hybrid Tandem Light-Emitting Diodes with Color-Selecting Intermediate Electrodes for Full-Color Displays

Nanoscale ◽  
2021 ◽  
Author(s):  
Heng Zhang ◽  
Lianna Chen ◽  
Shuming Chen
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Hybrid ◽  
Full Color ◽  
The Poor ◽  
Color Displays ◽  
Poor Stability ◽  
Color Patterning

The immaturity of color patterning technology and the poor stability of blue (B) quantum-dots are two of the challenges that restrict the development of quantum-dot electroluminescence displays. In this work,...

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