Research Paper: Dopant and Structure Optimization for OLED Microdisplays
Summary
In this paper the researchers from Electronics and Telecommunications Research Institute (ETRI), Korea demonstrate how optimized dopant selection and device structure improve color purity and efficiency in OLED microdisplays for mixed reality. By combining a deep-blue fluorescent emitter with four green and two red phosphorescent dopants, the researchers tuned cavity length and emission layer composition to maximize performance. Using Setfos, the team simulated CIE color coordinates under different transport layer thicknesses and filter transmittance. The final panel achieved an expanded 130.2% sRGB color gamut, with optimal red dopants between 610–620 nm offering a balance of efficiency and gamut.
Publication details
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. Optical Materials (2025). https://doi.org/10.1016/j.optmat.2024.116571
Fluxim tools used
Setfos — optical simulations to calculate CIE color coordinates, evaluate filter transmittance effects, and optimize cavity resonance below 460 nm for enhanced color purity.
Why it matters
Expands OLED microdisplay gamut to 130.2% sRGB, enabling vibrant MR applications.
Provides guidelines for dopant selection balancing efficiency and color purity.
Demonstrates Setfos as a key design tool linking structure, material choice, and device color outcomes.
FAQs
Which Fluxim tool was used and why?
Setfos simulated optical properties and CIE coordinates, allowing optimization of emission spectra and device structure.
What was the key result?
An OLED microdisplay panel with a 130.2% sRGB color gamut, enabled by optimized dopant spectra and cavity length tuning.