High-performance organic light-emitting diodes comprising ultrastable glass layers

Area of Science:

• Materials Science
• Solid-State Physics
• Organic Electronics

Background:

• Organic light-emitting diodes (OLEDs) are crucial solid-state light sources for displays, lighting, and signage.
• Device efficiency and operational stability are key performance metrics for commercial OLED applications.

Purpose of the Study:

• To enhance the performance of OLEDs by utilizing ultrastable glass functional layers.
• To demonstrate a generalizable method for improving OLED efficiency and lifetime.

Main Methods:

• Fabricating OLED functional layers using ultrastable glasses, representing a thermodynamically stable molecular conformation.
• Optimizing the growth condition for ultrastable glass layers at approximately 85% of the material's glass transition temperature.

Main Results:

• OLEDs with ultrastable glass layers exhibited >15% enhancement in both external quantum efficiencies and LT70 lifetimes compared to reference devices.
• Improvements were observed across four different phosphorescent emitters, indicating broad applicability.

Conclusions:

• The use of ultrastable glasses provides a general strategy to maximize OLED performance, independent of specific emitter materials or device architectures.
• This approach offers a pathway to significantly improve OLED efficiency and operational stability for commercial applications.