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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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High-Throughput Virtual Screening of Host Materials and Rational Device Engineering for Highly Efficient
Deepak Kumar Dubey1, Diksha Thakur2, Rohit Ashok Kumar Yadav1
1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.
ACS Applied Materials & Interfaces
|May 28, 2021
Summary
This study developed a new method for virtually screening organic materials to design efficient organic light-emitting diodes (OLEDs). Optimized OLEDs achieved record power efficiency and created safer, physiologically friendly lighting solutions.
Area of Science:
- Materials Science
- Organic Electronics
- Device Physics
Background:
- Host and electron-transporting materials (ETMs) are critical for organic light-emitting diodes (OLEDs) performance.
- Current methods lack efficient virtual screening for organic materials and device design.
- Material chemistry offers vast possibilities for novel OLED structures.
Purpose of the Study:
- To develop a methodology for fast virtual screening of host materials for OLEDs.
- To design and optimize a highly efficient multistack OLED device structure.
- To create physiologically friendly OLED lighting solutions.
Main Methods:
- Utilized the SETFOS 4.5 software for high-throughput virtual screening of host materials.
- Implemented a co-host approach and optimized device structure with two different ETMs.
- Fabricated solution-processed OLED devices for performance evaluation.
Main Results:
- Achieved a record 83.20 lm/W power efficiency and 61,362 cd/m² brightness for a green OLED.
- Developed a blue, hazard-free OLED (2083 K) with 51.4 lm/W power efficiency and 44,548 cd/m² luminance.
- Demonstrated significantly improved safety metrics for retinal protection and melatonin generation compared to traditional lighting.
Conclusions:
- The developed virtual screening and device design methodology enables high-performance OLEDs.
- Optimized OLEDs offer superior efficiency and safer lighting alternatives.
- Balanced charge carriers, mixed-host systems, and optimized energy levels contribute to enhanced device performance.
