64‐1: Novel Highly Stable Organic Phosphors and Their Application to Cd‐free Color Conversion Sheets for Wide Color Gamut LCDs

Abstract

In this study, organic phosphors of high color purity, high fluorescence quantum yield of over 90%, short emission decay time of less than 100 nanoseconds, and high stability that resists degradation even in the presence of oxygen were achieved. By using those organic phosphors, novel color conversion sheets for liquid crystal displays of wide color gamut without toxic elements such as cadmium were achieved. Those sheets can achieve an ultra‐wide color gamut that covers more than 99% of both DCI‐P3 standard and Adobe RGB standard, and more than 90% of BT.2020 standard. Also, those sheets can achieve a higher radiance than QD sheets without cadmium. So, they can be a promising alternative to QD sheets with cadmium. In addition, those sheets do not require a barrier film and do not show edge degradation, which is an issue with QD sheets. The resulting organic phosphors can be applied to various photoluminescence‐based applications and the cadmium‐free color conversion sheets can contribute to the development of environmentally friendly and energy‐saving displays.