New Laser Dye Systems Based on Luminescent Transition Metal Complexes.
Abstract
Excited state interactions of luminescent ruthenium (II) complexes with laser dyes are being studied. Novel experimental tools including an ultra high accuracy quantum counter comparator, a microcomputer controlled nanosecond risetime boxcar integrator, a luminescent wavelength shifter method for correcting for the wavelength dependence of phototube transit times in decay time measurements, and a step excitation method for studying reversible excited state electron transfer have been developed to facilitate these studies. Energy transfer from the tris(2,2'-bipyridine)-ruthenium(II) complex to a variety of rhodamine and oxazine laser dyes have been demonstrated in both homogeneous solutions and in micellar assisted ones. In favorable cases energy transfer efficiencies from the charge transfer (CT) sensitizing state of the Ru(II) complex to the singlet state of the laser dyes exceed 80%. To date energy transfer appears to be dominantly by a Forster resonance mechanism. In the micellar cases the dye and complex are brought so closely together that contact quenching of the excited dye singlet state can occur. Applications of these systems to new binary laser dyes are under study. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 30, 1979
- Accession Number
- ADA074245
Entities
People
- James N. Demas
Organizations
- University of Virginia