Abstract
High efficiency non‐doped blue and white organic light emitting diodes (OLEDs) are realized by using a bilayer interface‐exciplex (i‐Exc) structure. Since the neutral exciplex are formed at the interface, the interface charge accumulation is reduced, thereby suppressing exciton quenching in the device. With the i‐Exc structure, a maximum external quantum efficiency (EQE) of 23.1% is achieved in the non‐doped blue phosphorescent OLED. Moreover, the white emission can be obtained by inserting an ultrathin orange‐red phosphorescent emitter into the blue devices. The charge trapping in the orange‐red emitter can be suppressed by adjusting the position of the ultrathin orange‐red emitting layer in the device, contributing to superior spectral stability. The WOLED achieves an EQE of 20.0% and exhibits a stable warm white emission. The Commission Internationale de l'Eclairage (CIE) coordinates of WOLED are (0.41, 0.40) at 5 V and slightly change to (0.40, 0.41) at 9 V.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.