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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Highly efficient inverted top-emitting organic light-emitting diodes using a lead monoxide electron injection layer
Qiang Wang1, Zhaoqi Deng, Dongge Ma
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
Optics Express
|November 13, 2009
Summary
High-efficiency inverted top-emitting organic light-emitting diodes (ITOLEDs) were achieved using lead monoxide (PbO) as an electron injection layer (EIL). This, combined with optical design, improved efficiency and color stability across viewing angles.
Area of Science:
- Materials Science
- Organic Electronics
- Optoelectronics
Background:
- Organic light-emitting diodes (OLEDs) are crucial for display and lighting technologies.
- Improving electron injection and light outcoupling remains a key challenge for high-performance OLEDs.
- Inverted top-emitting OLEDs (ITOLEDs) offer advantages in certain applications but require optimized structures.
Purpose of the Study:
- To develop high-efficiency ITOLEDs with stable color and wide viewing angles.
- To investigate the role of lead monoxide (PbO) as an effective electron injection layer (EIL).
- To optimize device structure for enhanced light outcoupling and reduced angular color shift.
Main Methods:
- Fabrication of green ITOLEDs incorporating a lead monoxide (PbO) electron injection layer (EIL).
- Optical design of the device structure, including resonant wavelength tuning and addition of an outcoupling layer.
- Characterization of device performance, including current efficiency, power efficiency, and angular color stability.
Main Results:
- Achieved a maximum current efficiency of 33.8 cd/A and a maximum power efficiency of 16.6 lm/W.
- Demonstrated saturated and stable colors with minimal variation within a 140-degree viewing cone.
- PbO EIL significantly reduced operational voltage, enhancing overall device efficiency.
- Optical optimization further improved efficiency and reduced angular color shift.
Conclusions:
- Lead monoxide (PbO) is an effective material for electron injection layers in ITOLEDs.
- Combined EIL and optical design strategies lead to simultaneous improvements in efficiency and angular performance.
- The developed ITOLEDs show potential for high-quality display and lighting applications.
