Strategic use of dopants and device structure optimization for enhanced color gamut and efficiency in organic light-emitting diodes microdisplay applications
Hyunsu Cho, Dae Hyun Ahn, Sukyung Choi, Gi Heon Kim, Chul Woong Joo, Chan-mo Kang, Jin-Wook Shin, Kukjoo Kim, Byoung-Hwa Kwon, Chunwon Byun, Nam Sung Cho, Young Jae An, Jin Sun Kim, Hyoc Min Youn,
Strategic use of dopants and device structure optimization for enhanced color gamut and efficiency in organic light-emitting diodes microdisplay applications, Optical Materials, Volume 159, 2025, 116571, ISSN 0925-3467,
The goal of this study was to enhance the color gamut and efficiency of OLED microdisplays by strategically selecting dopants and optimizing the device structure, especially for top-emitting white OLEDs combined with color filters (CFs).
Key findings revealed that careful tuning of the emitting materials’ photoluminescence properties and optimizing the device’s optical cavity significantly improved color purity and luminance. Using a deeper red dopant and selecting green dopants with narrow spectral widths achieved a color gamut of 130.2% (sRGB standard). Adjustments to cavity length allowed emission resonance at shorter wavelengths, critical for maximizing blue color purity, which is essential for high-resolution microdisplays.
Fluxim’s Setfos software was pivotal in this study for optical simulations, allowing the team to model device structures, predict emission spectra shifts, and optimize cavity designs before fabrication. This reduced experimental iterations and supported a deeper understanding of optical interference effects crucial for microdisplay development.
The findings are important for the scientific community as they offer a clear path toward achieving high-performance, vibrant OLED microdisplays—critical for applications like augmented and mixed reality devices, where both color quality and energy efficiency are essential.