A linear deep-blue bipolar fluorescent material with the CIEy < 0.065 serving as the emitter and host for high-performance monochromatic and hybrid white OLEDs

In this work, a novel linear deep-blue hybrid local and charge transfer fluorophore ( P2MPC ) with good thermal stability, balanced bipolar transporting properties, a high horizontal dipole ratio of 86.5%, and a triplet state energy over 2.4 eV is developed for constructing high efficiency and low efficiency roll-off monochromatic and hybrid white organic light emitting diodes (OLEDs). P2MPC can not only serve as a neat emitter to develop non-doped OLEDs, realizing a Commission Internationale de LEclairage (CIE) coordinate of (0.157, 0.064) and a high external quantum efficiency (EQE) of 7.15%, but also act as a universal host to sensitize green, yellow and red phosphors, achieving high efficiency and low roll-off phosphorescent OLEDs. More significantly, high-performance complementary-color and three-color hybrid white OLEDs with forward-viewing EQEs and power efficiencies of 24.63%/82.43 lm W 1 and 22.65%/55.60 lm W 1 are achieved using P2MPC as the emitter and host. By weakening the electron-trapping effect on dopant sites, white OLEDs exhibit excellent spectral stability with the CIE coordinates varying from (0.003, 0.002) and (0.004, 0.008) in the range of 1000 to 10000 cd m 2 . Such high efficiencies achieved based on P2MPC can provide a new insight for designing high-performance non-doped deep-blue OLEDs and hybrid white OLEDs. A linear deep-blue HLCT material P2MPC served as the emitter and host in high-performance monochromatic and hybrid white OLEDs.