Highly efficient and stable green fluorescent OLEDs with high color purity using a BODIPY derivative

Abstract

Although high color purity and efficient organic light-emitting devices (OLEDs) are imperative for high-resolution display applications, the stability of these OLEDs lags far behind that of OLEDs based on conventional thermally activated delayed fluorescent and/or phosphorescent emitters. In this work, using a BODIPY derivative, we successfully developed a high-efficiency, long-lifetime green OLED with high color purity. Based on sophisticated device engineering especially by reducing carrier accumulation at the hole-transporter/emission layer interface, the optimized device realized a narrow full width at half maximum of 32 nm, CIE coordinates of (0.28, 0.67), external quantum efficiency of approximately 19%, and lifetime (LT₅₀) of 14 000 h at 1000 cd m⁻². The device stability was 4.7 times longer than that in the previous work, and among the best reported in the related literature.