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

Journal article

Sajjad, T, Sharma, Nidhi, Pal, Amlan K, Hasan, Kamrul, Xie, Guohua, Kölln, Lisa S, Hanan, Garry S, Samuel, Ifor DW and Zysman-Colman, Eli (2016). Controlling the emission efficiency of blue-green iridium (iii) phosphorescent emitters and applications in solution-processed organic light-emitting diodes. Journal of Materials Chemistry C. 4 (38), pp. 8939-8946. https://doi.org/10.1039/C6TC02909D
AuthorsSajjad, T, Sharma, Nidhi, Pal, Amlan K, Hasan, Kamrul, Xie, Guohua, Kölln, Lisa S, Hanan, Garry S, Samuel, Ifor DW and Zysman-Colman, Eli
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%.

Year2016
JournalJournal of Materials Chemistry C
Journal citation4 (38), pp. 8939-8946
PublisherRoyal Society of Chemistry (RSC)
ISSN2050-7534
Digital Object Identifier (DOI)https://doi.org/10.1039/C6TC02909D
Publication dates
Print30 Aug 2016
Online30 Aug 2016
Publication process dates
Accepted30 Aug 2016
Deposited05 Feb 2020
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