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Optimization of Quantum Dot Thin Films using Electrohydrodynamic Jet Spraying for Solution-Processed Quantum Dot

Tuan Canh Nguyen¹, Thi Thu Thuy Can¹, Woon-Seop Choi²

¹Department of Display Engineering, Hoseo University, Asan, Chungnam, 31499, Korea.

Scientific Reports

|September 27, 2019

Summary

Electrohydrodynamic (EHD) jet spraying enables quantum dot (QD) layer fabrication for light-emitting diodes (LEDs). A straight-line spraying technique achieved uniform, large-area QD films, enhancing LED performance.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Electrohydrodynamic (EHD) jet spraying is a promising technique for fabricating quantum dot (QD) layers in light-emitting diodes (LEDs).
Achieving uniform morphology and scalable production of QD layers is crucial for high-performance, all-solution-processed QD-LEDs.

Purpose of the Study:

To investigate and compare different EHD jet spraying techniques for QD layer fabrication.
To identify an optimal spraying method for uniform, large-area QD film deposition and improved QD-LED performance.

Main Methods:

Utilized EHD jet spraying with three distinct deposition patterns: big circular film, spiral-line, and straight-line methods.
Fabricated QD films using these techniques and evaluated their uniformity.
Fabricated QD-LED devices using the most promising spraying method and characterized their optoelectronic properties.

Main Results:

The straight-line spray technique demonstrated superior capability in producing uniform QD layers over large areas compared to the circular and spiral methods.
QD-LEDs fabricated using the straight-line spray method exhibited enhanced performance.
Achieved a low turn-on voltage of 3.0 V, a luminance of 7801 cd/m², and a maximum current efficiency of 2.93 cd/A.

Conclusions:

The straight-line EHD jet spraying technique is highly effective for fabricating uniform, large-area quantum dot films.
This method significantly improves the performance of solution-processed quantum dot light-emitting diodes.
EHD jet spraying offers a viable pathway for scalable, high-performance QD-LED manufacturing.