- Unit: Faculty of Physics
- Keywords: Spectrometer, Hamamatsu PMA-11, integrating sphere, absorption, fluorescence, phosphorescence, spectra, quantum yield, chromaticity coordinates, radiative and non-radiative excitation decay, optical parameters, concentration, diffusion coefficient, photostability determination
- Responsible person: Dr. Karolis Kazlauskas, tel. +370 600 34126,
High - precision device for fluorescence spectra measurements.
Spectrometer dimensions: 30 cm x 15 cm x 40 cm.
Spectral range 196 nm – 970 nm.
Resolution ≤2 nm.
Pixel of CCD matrix - 1024.
Dark current at 20 ms exposure: 75 electrons.
Light is collected through optical cable.
Exposure interval: 0.02 – 30 s.
Application. Measurements of absorption, fluorescence and phosphorescence spectra of organic compounds. Fluorescence and phosphorescence quantum yield determination using integrating sphere method and by comparing with etalon material. Determination of chromaticity coordinates. Determination of radiative and non-radiative excitation decay rates.Detetermination of singlet and triplet energy levels. Determination of optical parameters at 8-300 K temperature. Determination of the concentration at which fluorescence quenching starts.Exciton diffusion coefficient and diffusion length determination in organic compounds. Stimulated emission threshold determination using thin stripe method. Photostability determination.