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Unformatted text preview: l: [email protected] Tris-(8-hydroxyquinoline)aluminium (Alq3) is the most used green-emitting material in organic light emitting diodes (OLEDs). For deeper understanding of its optical properties, the binary complexes of Al with 8-hydroxyquinoline were studied and extended to Eu(III) and also Eu(I II), Tb(III) and Dy(III) with dibenzoylmethane (DBM). By using 1,10- phenanthroline as the second ligand, the ternary complexes of Al, Eu(III), Tb(III) and Dy(III) were isolated. All lanthanide-quinoline complexes (binary and ternary) have shown a very sharp luminescence band almost as a line due to the width at the base of the pe ak of the spectrum (δλ) is less than 2 nm at 639.6 nm for Euq 3, 602.2 nm for Euq3(phen)3 and 531.7 nm for Tbq3(phen)3. For lanthanide-DBM complexes, the intensity in Eu(DBM) 3Phen is higher than Eu(DBM)3 at 612 nm and for the Dy(DBM)3 complex, the maximum emission peak observed at 508 nm, the intensity increase significantly for Dy(DBM)3Phen and similarly at 415 nm. In contrast, the intensity is tremendously reduced in the present of second ligand for Tb(III) complexes at 510 nm for Tb(DBM) 3 and 491 nm for Tb(DBM)3(phen). In general the presence of 1,10-phenanthroline in lanthanide complexes, the PL spectra have shown a shift to the lower wavelength. Nevertheless, no significant change in Alq 3 and Alq3(phen)3 was observed at 507.2 nm. 85 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia ANA-P20 NEW CLASS OF LIGAND BASED ON CROWN ETHER FLUORENE FOR PHOTOLUMINESCENCE STUDIES Mohamed Ahmed Moallim and Muhammad Idiris Saleh School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] In the last decades, fluorene based materials become very promising field and have received strong interests due to the huge energy gap, in combination of crown ether for coordination with metal and flourene with is rich in delocalized electrons, and these compounds have shown great promise as potential candidate for photoluminescence materials. The existence of multiple donor sectors wi...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11