Efficient, Color-Stable, and Long-Lived White Organic Light-Emitting Diodes Utilizing Phosphorescent Molecular...

Area of Science:

• Materials Science
• Organic Electronics
• Photophysics

Background:

• White organic light-emitting diodes (WOLEDs) are crucial for display and lighting applications.
• Achieving high efficiency, stability, and color purity simultaneously remains a challenge in WOLED development.

Purpose of the Study:

• To develop highly efficient and stable single-stack hybrid WOLEDs.
• To investigate the performance of a device incorporating amber phosphorescent and blue fluorescent emitters.

Main Methods:

• Fabrication of a single-stack hybrid WOLED device utilizing two distinct emissive layers.
• Characterization of the device's optoelectronic properties, including efficiency, color stability, and operational lifetime.

Main Results:

• The optimized WOLED device achieved a high external quantum efficiency (EQE) of 45.5%.
• Exceptional power efficiency of 97.4 Lm W^-1 was recorded.
• Demonstrated high color stability across various current densities and an estimated operational lifetime (LT₉₅) of 50,744 hours at 1000 cd m^-2.

Conclusions:

• The developed single-stack hybrid WOLEDs exhibit superior performance characteristics.
• The combination of phosphorescent and fluorescent emitters offers a promising pathway for advanced display technologies.