InP-Based Quantum Dots Toward Efficient Color Conversion Pixels

Colloidal quantum dots (QDs) have been known to be the best candidates for photon emissive materials owing to their unique optical properties including high color purity and quantum efficiency. Cd-based QDs like CdSe, CdS, and CdTe have been extensively studied and their synthesis and application methods are very well developed. However, their potential harmful effects on health and the environment prohibit the applications to commerical products. InP QDs have been considered as the best alternative owing to their band gaps corresponding to visible light as well as their relatively low toxicity, despite the high tendency of oxidation and the small defect tolerance originating from relatively high covalent character. In this talk, we will present InP-based core/shell-type QDs showing almost unity photoluminescence quantum efficiency and long-term stability on high power blue irradiation. Based on this superior optical properties, the QDs could be applied for the color conversion pixels on blue OLED display. Structural and spectroscopic analysis about the In-based QDs will be introduced as well.