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

• DOI: 10.1021/ja052880t
• Publication Date: 2005-09-07T04:54:04Z
• Authors: Youngmin You; Soo Young Park
• Keywords: Solvatochromism; Exothermic reaction

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.