Abstract
Authors have demonstrated highly efficient white organic light-emitting diodes (WOLEDs) using the same blue emitter, 1,4-bis[2-(7- N-diphenyamino-2-(9,9-diethyl-9H-fluoren-2-yl)) vinyl] benzene (DAF-ph), and the different red emitters, bis(5-isobutyryl-2-phenylpyridinato-C,N)iridium(III) (acetylacetonate) ((Ibppy)2Ir(acac)) and bis(5-acetyl-2-phenylpyridinato-C,N) iridium(III) (acetylacetonate) ((acppy)2Ir(acac)). Although the red emitters had the same highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), they showed the different electrical and optical characteristics due to the difference of stearic hindrance. Two devices showed the maximum luminance of 21,600 and 30,500 cd/m 2 at 14 V, maximum luminous efficiency of 30.2 and 38.0 cd/A at 0.004 and 0.005 mA/cm 2, and CIE x , y coordinates of ( x=0.37, y=0.43) and ( x=0.33, y=0.40) at 10 V, respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
