Effective Manipulation of the Electronic Effects and Its Influence on the Emission of 5-Substituted Tris(8-quinolinolate) Aluminum(III) Complexes
作者:Victor A. Montes、Radek Pohl、Joseph Shinar、Pavel Anzenbacher
DOI:10.1002/chem.200501403
日期:2006.6.2
tris(8-quinolinolate) aluminum(III) (Alq(3)) have resulted in extensive use of this material for small molecular organic light-emitting diode (OLED) fabrication. So far, efforts to prepare stable and easy-to-process red/green/blue (RGB)-emitting Alq(3) derivatives have met with only a limited success. In this paper, we describe how the electronic nature of various substituents, projected via an arylethynyl
Red−Green−Blue Emission from Tris(5-aryl-8-quinolinolate)Al(III) Complexes
作者:Radek Pohl、Victor A. Montes、Joseph Shinar、Pavel Anzenbacher
DOI:10.1021/jo035602q
日期:2004.3.1
A simple yet effective strategy for synthesis of 5-aryl-8-quinolinolate-based electroluminophores with tunable emission wavelengths is presented. Two different pathways for the attachment of electron-donating or electron-withdrawing aryl groups to the 5-position of the quinolinolate ligand via Suzuki coupling were developed. A successful tuning in the emission color was achieved: the emission wavelength was found to correlate with the Hammett constant of the respective substituents, providing a powerful strategy for prediction of the optical properties of new electroluminophores.
Synthesis, characterization and DFT investigation of aluminum complexes of aryl- substituted-8-hydroxyquinoline
作者:FakhrEldin O. Suliman、Saleh N. Al-Busafi、Moza Al-Risi、Khalifa N. Al-Badi
DOI:10.1016/j.dyepig.2011.06.033
日期:2012.3
New aryl substituted 8-hydroxyquinoline derivatives have been synthesized. The compounds were characterized by H-1, C-13-NMR spectroscopy and mass spectrometry. The aluminum complexes of these derivatives show strong green emission in the range 530-535 nm with high quantum yield compared to the parent tris (8-hydroxyquinolinato)aluminum(III) complex. The structure of the aryl-substituted 8-hydroxyquinoline aluminum complexes in the ground state have been optimized It the B3LYP/6-31G* level of theory. The parent 8-hydroxyquinoline has also been examined using this method with the same basis set. A clear correlation between the shortening of the Al-N bond and red shift in the fluorescence emission band was observed. We have also found that substitution at the 5 and 7 position of the 8-hydroxyquinoline ligand cause simultaneous energy lowering of both highest occupied molecular orbital and the lowest unoccupied molecular orbital with the 5, 7-aryl substituted derivatives exhibiting the greatest effect. (C) 2011 Elsevier Ltd. All rights reserved.