- Unit: Faculty of Physics
- Keywords: Organic compounds, solutions, layers, fluorescence, phosphorescence, correlated single photon counting technique, streak camera, organic electronics, OLED, solar cells, sensors
Excited state lifetime determination of sample solutions and thin films of organic compounds using the time correlated single photon counting technique and/or streak camera.
The fluorescence decay is measured at the maximum of the emission spectrum. Streak camera allows to register the excitation decay of the whole emission spectrum. One sample per measurement. Fluorescent or phosphorescent materials should have their absorption and fluorescence in the range from 196 nm to 957 nm. The samples can be excited by the following wavelengths: 280 nm, 330 nm, 375 nm and 450 nm. Pulse duration - 70 ps. The materials must exhibit efficient absorbance in the spectral range from 196 nm to 957 nm and good solubility in common organic solvents. Temporal resolution of the time correlated single photon counting system - 16 ps. The system allows to select the excitation wavelength to additionally integrate the delay line for the measurements of long decay transients.
Application. Measurements of the excited state decay transients will enable to evaluate their potential for applications in organic modern electronic devices (organic light emitting diodes, organic solar cells, sensors).