Application of Quantum-dot Patterned Film with Scattering Nanoparticles for the High Efficiency Displays

Quantum dot (QD) as a color converting material in the form of patterned film can effectively improve the optical efficiency of displays. Since all of the light passing through the QD film cannot be fully down-converted, however, novel structure or materials are required to improve the light down-converting efficiency in the QD film. TiO₂ and wrinkled silica particles are respectively applied as scattering nanoparticles which can increase optical path of light in this study. From experimental results, it was confirmed that optical efficiencies of red and green light in white OLED prepared with QD and TiO₂ were enhanced further by 57.3% and 17.5%, respectively. In addition, the QD-converting efficiency to green light from blue μ-LED was increased using wrinkled silica-QD hybrid particles, resulting in the enhanced luminous efficacy of 13.1lm/W with 15wt% QD concentration.