Inter-Ligand Energy Transfer and Related Emission Change in the Cyclometalated Heteroleptic Iridium Complex:  Facile and Efficient Color Tuning over the Whole Visible Range by the Ancillary Ligand Structure

Solvatochromism Exothermic reaction
DOI: 10.1021/ja052880t Publication Date: 2005-09-07T04:54:04Z
ABSTRACT
We report a novel color tuning methodology in the electrophosphorescent iridium complex by substituting one cyclometalating ligand to an ancillary as emitting center. Highly efficient exothermic inter-ligand energy transfer (ILET) from MLCT3 state produced between and 2-(2,4-difluorophenyl)pyridine LX3 of offers chance access wider range sky blue (478 nm) red (666 nm). Characteristic shapes photoluminescence spectra, strong solvatochromic phenomena well DFT calculations gave evidences for this ILET.
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