High light-extracting efficiency for OLED directly fabricated on double-side nanotextured silica substrate

Area of Science:

• Optoelectronics
• Materials Science
• Nanotechnology

Background:

• Organic light-emitting devices (OLEDs) suffer from significant light loss due to waveguide and substrate modes.
• Efficient light extraction is crucial for improving OLED performance and reducing energy consumption.

Purpose of the Study:

• To demonstrate an economical and effective method for enhancing light extraction in OLEDs.
• To investigate the impact of double-sided nanotexturing on OLED efficiency.

Main Methods:

• Fabrication of pillar arrays on both sides of a silica substrate using inductively coupled plasma etching and colloidal masking.
• Integration of quasi-periodic Bragg scattering and subwavelength-scaled antireflection structures.
• Direct fabrication of OLEDs on the nanotextured substrate.

Main Results:

• The Bragg scattering structure at the silica/ITO interface doubled current efficiency.
• The antireflection structure at the silica/air interface increased efficiency by an additional 40%.
• An overall enhancement factor of approximately 2.8 in current efficiency was achieved.

Conclusions:

• Double-sided nanotexturing is a highly effective strategy for improving light extraction in OLEDs.
• The combined Bragg scattering and antireflection structures offer significant performance gains.
• This method provides an economical approach to enhance OLED efficiency.