Quantum dot (QD) nanocrystals dispersed in photoresist (PR) film was developed and applied to white organic light-emitting diode (OLED) to improve optical power of red color through down-converting of blue and green light. To integrate to white OLED display panel, the QD dispersed photoresist film was prepared in a thickness of 2 μm with high concentration of QDs up to 30 wt%. QDs were dispersed successfully in PR with a matching of nonpolar characteristic for the ligands of QDs and PR as well as a careful mixing process of PR and QD dispersed solutions. We also realized the patterning of QD dispersed PR film with a stripe pattern of 60-μ m width without a residual layer. The experimental measurement after passing through a 30 wt% QD dispersed PR film and a red color filter in white OLED shows the enhancement of 40.2% in the optical power of red color compared to that from a conventional white OLED without QD dispersed PR film.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering