Highly efficient deep‐blue fluorescent dopant for achieving low‐power OLED display satisfying BT.2020 chromaticity

In this work, novel blue‐fluorescent dopants with a heteroaromatic ring skeleton instead of the conventional pyrene skeleton were investigated. Bottom‐emission organic light‐emitting diodes (OLEDs) fabricated using the novel blue‐fluorescent dopants in light‐emitting layers achieved better deep‐blue chromaticity than OLEDs based on a conventional pyrene‐based dopant, while maintaining both high external quantum efficiency (EQE) and comparable reliability. The attainment of deep‐blue chromaticity without losing high EQE was ascribed to the improvement of the efficiency of energy transfer from the host to the dopant. Furthermore, it was estimated that using this novel dopant in a top‐emission OLED panel that satisfies BT.2020 chromaticity enables the power consumption of the whole panel to be 24% lower than that of the panel with a conventional dopant. We have succeeded in developing a stable deep‐blue fluorescent dopant which has a shorter emission wavelength and higher emission efficiency than conventional pyrene‐based dopants. It was revealed that the power consumption of a panel using this novel dopant was estimated to be lower than that of a conventional one.