Luminescence
Introduction
Luminescence describes the light-emission of electronically excited molecules. The nature of excitation can happen in different ways. For example photons (photo-luminescence), sound waves (sonor-luminescence) or even heat (thermal-luminescence) can induce light emission of materials. In nature, one can observe bio-luminescence of flowers or animals.
One knows two different types of luminescence: fluorescence and phosphorescence, that can be distinguished by their emitting state. Excited electrons relax from a metastable first excited singulett state (S1) or triplett state (T1) to the ground-state (S0).
If there was no emission of light due to the absorbance of energy, the energy transfer must have happened in a different way. Besides radationless transfer of energy (quenching) and (photo-) chemical reactions the energy can be distributed inside the molecules (ITC and IC).
Varian Cary Eclipse
Luminescence-furnace
The group of Prof. Becker uses temperature-ranges of -191°C to 400°C (77-673K). To reach low temperatures there can be used a nitrogen bath-cryostat; to work at higher temperatures there is a custom built luminescence-furnace to investigate crystals and powders. As a new feature, luminescence life-times can be measured.
Application:
- Varian Cary Eclipse Luminescence photospectrometer
- Oxford DN-V Nitrogen Bath-cryostat (77K-RT)
- Luminescence-furnace (RT-673K)
- Pfeiffer Turbomolecular Vacuumpump
Responsible:
Content Manager
Feedback to s.dlugocz@tu-braunschweig.de
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