Abstract
We demonstrate markedly improved electroluminescence (EL) intensity and reduced external quantum efficiency (EQE) roll-off of a device which presents two emitting layers of fac-tris-(2-phenylpyridine) iridium [Ir(ppy)3] in 4,4′-bis(9-carbazolyl)-2,2′-biphenyl (CBP) and 1,3-bis[2-(2,2′-bipyridine-6-yl)-1,3,4-oxadiazo-5-yl]benzene (Bpy-OXD); 4,7-diphenyl-1,10-phenanthroline/Bpy-OXD layers were used as hole blocking and electron transport layers. The device exhibits a maximum EQE of 15.5% (corresponding to an efficiency of 56.8 cd A−1) at a luminance of 600 cd m−2, which is twice the value (8.2%) of the reference diode using Ir(ppy)3 doped CBP as a single emitting layer; the device still maintained a 6.5% efficiency at a luminance of 70 450 cd m−2. The mechanism of this marked improvement in EL intensity and decrease in the EQE roll-off was also explored in detail.
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.
