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Tuning the Energy Level and Photophysical and Electroluminescent Properties of Heavy Metal Complexes by Controlling the Ligation of the Metal with the Carbon of the Carbazole Unit
Author(s) -
Yang C. L.,
Zhang X. W.,
You H.,
Zhu L. Y.,
Chen L. Q.,
Zhu L. N.,
Tao Y. T.,
Ma D. G.,
Shuai Z. G.,
Qin J. G.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600663
Subject(s) - carbazole , electroluminescence , materials science , density functional theory , metal , dopant , single crystal , photochemistry , crystallography , doping , computational chemistry , nanotechnology , optoelectronics , chemistry , metallurgy , layer (electronics)
Four novel Ir III and Pt II complexes with cyclometalated ligands bearing a carbazole framework are prepared and characterized by elemental analysis, NMR spectroscopy, and mass spectrometry. Single‐crystal X‐ray diffraction studies of complexes 1 , 3 , and 4 reveal that the 3‐ or 2‐position C atom of the carbazole unit coordinates to the metal center. The difference in the ligation position results in significant shifts in the emission spectra with the changes in wavelength being 84 nm for the Ir complexes and 63 nm for the Pt complexes. The electrochemical behavior and photophysical properties of the complexes are investigated, and correlate well with the results of density functional theory (DFT) calculations. Electroluminescent devices with a configuration of ITO/NPB/CBP:dopant/BCP/AlQ 3 /LiF/Al can attain very high efficiencies.