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Synthetic control of excited states: New ancillary ligands for cyclometalated Ir(III) complexes

Li, Jian and Djurovich, Peter I. and Alleyne, Bert D. and Yousufuddin, Muhammed and Ho, Nam and Thomas, J. Christopher and Peters, Jonas C. and Bau, Robert and Thompson, Mark E. (2004) Synthetic control of excited states: New ancillary ligands for cyclometalated Ir(III) complexes. Abstracts of Papers of the American Chemical Society, 227 . INOR 385. ISSN 0065-7727.

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Due to the strong spin-orbit coupling of Ir atom, many cyclometalated Ir complexes are phosphorescent at room temperature, making these materials leading candidates for dopant emitters in OLEO applications. One method of modifying emission energies of Ir phosphors is to change the nature of cyclometalating ligand. This presentation will describe a new method of tuning the lowest excited state energy by employing high triplet energy ancillary ligands for Ir phosphors. Using different ancillary ligands, i.e., a family of pyrazolyl ligands and their analogues, and the same cyclometalating ligand, paratolylpyridine (tpy), it is possible to vary the emission color of Ir phosphors over a wide range. Electrochemical analysis shows that different ancillary ligands modify the emission energy by affecting the energy of HOMO while leaving the LUMO relatively unchanged. Meanwhile, the Ir complexes appear to have longer luminescence lifetime and slower radiative decay when their emission energies increase above some level.

Item Type:Article
Li, Jian0000-0003-0297-6528
Peters, Jonas C.0000-0002-6610-4414
Thompson, Mark E.0000-0002-7764-4096
Additional Information:© 2004 American Chemical Society.
Record Number:CaltechAUTHORS:20140728-134929197
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47528
Deposited By: Tony Diaz
Deposited On:28 Jul 2014 21:06
Last Modified:09 Mar 2020 13:19

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