Use of Recycling-Reflection Color-Purity Enhancement Film to Improve Color Purity of Full-Color Micro-LEDs

Area of Science:

• Optoelectronics
• Materials Science
• Display Technology

Background:

• Full-color micro-light-emitting diode (LED) displays commonly use quantum dots (QDs) for color conversion.
• Incomplete wavelength absorption by QDs leads to mixed emission, compromising color purity in micro-LED displays.

Purpose of the Study:

• To propose and evaluate a recycling-reflection color-purity-enhancement film (RCPEF) for improving micro-LED display performance.
• To address the issue of wavelength mixing and enhance color purity and efficiency in QD-based color conversion.

Main Methods:

• Development and integration of a novel recycling-reflection color-purity-enhancement film (RCPEF).
• Experimental testing of RCPEF with green and red quantum dots (QDs) using a 445.5 nm excitation source.
• Measurement of color purity and light conversion efficiency before and after RCPEF implementation.

Main Results:

• The RCPEF effectively reflects incident wavelengths, preventing mixing with converted wavelengths from QDs.
• With green QDs, RCPEF increased color purity from 77.2% to 97.49% and light conversion efficiency by 1.97 times.
• With red QDs, RCPEF improved color purity to 94.68% and light conversion efficiency by 1.46 times.

Conclusions:

• The proposed RCPEF significantly enhances color purity and light conversion efficiency in micro-LED displays.
• RCPEF technology offers a viable solution for achieving high-performance full-color displays using micro-LEDs and QDs.
• This approach effectively overcomes the limitations of wavelength mixing in current QD color conversion methods.