Multi-parameter and multi-objective optimization of stratified OLEDs over wide field-of-view considering thickness...

Area of Science:

• Materials Science
• Optoelectronics
• Manufacturing Engineering

Background:

• Organic light-emitting diodes (OLEDs) face limitations in large-size displays due to poor wide field-of-view (FOV) performance and low production yields.
• Improving optical characteristics and structural stability is crucial for advancing OLED technology in large-scale applications.

Purpose of the Study:

• To develop an optimization and analysis method for stratified OLEDs to enhance optical performance over wide FOVs.
• To incorporate thickness tolerance into the design process to ensure structural stability and improve production yields.

Main Methods:

• Defined key optical parameters: external quantum efficiency (EQE), current efficiency (CE), just noticeable color difference (JNCD), and color coordinates.
• Employed genetic algorithms (GAs) for multi-parameter, multi-objective optimization of OLEDs over wide FOVs.
• Introduced thickness tolerance analysis to assess and ensure structural stability against manufacturing variations.

Main Results:

• Optimized Green Bottom-emitting OLED (G-BOLED) demonstrated significant improvements: CE increased by over 30%, EQE by over 20%, and JNCD reduced from 4.45 to 1.36 across a 0-60° FOV.
• The optimized device structure exhibited high stability against practical thickness fluctuations, maintaining preferred performance regions.
• The method successfully improved optical performance over wide FOVs and provided a stable structure for stratified OLEDs.

Conclusions:

• The proposed optimization method effectively enhances wide FOV optical performance and structural stability in stratified OLEDs.
• This approach is expected to increase production yields and facilitate the application of OLEDs in large-size display panels.
• The integration of thickness tolerance analysis is key to developing robust and manufacturable OLED devices.