Controlling the emission efficiency of blue-green iridium(III) phosphorescent emitters and applications in solution-processed organic light-emitting diodes

Muhammad T. Sajjad, Nidhi Sharma, Amlan K. Pal, Kamrul Hasan, Guohua Xie, Lisa S. Kölln, Garry S. Hanan, Ifor D. W. Samuel, Eli Zysman-Colman

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We show that the emission efficiency of blue-green phosphorescent emitters can be controlled through coupling of the excited state to vibrational modes. We controlled this vibrational coupling through choice of different ligands and as a result, complexes with CF3-groups on the ancillary ligand were essentially non-emissive (ΦPL < 1%), whereas with isosteric CH3-groups the complexes were strongly emissive (ΦPL > 50%). Emission of the complexes can be drastically improved (30 times higher ΦPL compared to degassed solution for the CF3-containing complexes) by blending them with an inert solid host such as PMMA, which mitigates metal-ligand vibrations. Solution-processed organic light-emitting diodes made from these materials showed efficiency as high as 6.3%.
Original languageEnglish
Pages (from-to)8939-8946
Number of pages8
JournalJournal of Materials Chemistry
Volume4
Issue number38
Early online date30 Aug 2016
DOIs
Publication statusPublished - 14 Oct 2016

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