Luminescence and fluorescence   Fig. 1  Aquaria victoria’s luminescence Fluorescence is a type of photoluminescence.  Photoluminescence refers to the process of light re-emission after a material has absorbed photons. Unlike reflection and scattering, the wavelength of the emitted light is longer than the wavelength of the absorbed light.  When a fluorescent or phosphorescent material is … Continue reading Principles of fluorescence spectroscopy (1) – What is fluorescence?