Date：2017-12-05 |
Views：2009 |
【Academic writing Sharing 20171201】 |
Highly efficient and spectrally stable white organic light-emitting diodes using new red heteroleptic Iridium(III) complexes
Article excerpt is from:Hee Un Kim, Jae-Ho Jang, Hea Jung Park, Byung Jun Jung, Wook Song, Jun Yeob
Lee, Do-Hoon Hwang
Dyes and Pigments, 2017 in press
Red phosphorescent iridium(III) complexes, (MPQ)2Ir(Pppy) and (MPQ)2Ir(TMSppy), were designed and successfully synthesized to investigate the effect of second cyclometalated Pppy and TMSppy ligands on their use in phosphorescent OLEDs.
The devices fabricated using (MPQ)2Ir(Pppy) and (MPQ)2Ir(TMSppy) exhibited EQE of
21.4% and 18.4%, respectively, at 15% doping concentration. Especially, the second cyclometalated Pppy ligand prevented concentration self-quenching and suppressed triplettriplet annihilation at high doping concentration. The WOLED fabricated using (MPQ)2Ir(Pppy) exhibited the highest EQE of 28.0%. Especially, CIE-X and CIE-Y values at different driving voltages of the WOLED fabricated with (MPQ)2Ir(Pppy) showed excellent spectral stability.
