Photo luminescence
• Molecules that have an electronic excitation are excited
• Molecules that have a vibration excitation are hot
• With light absorption, molecules may become hot and excited
• Physical process that leads to excited molecules can be
physical(e.g. absorption of light), mechanical (e.g. friction),
or chemical(e.g. reactions)
• When excited molecular states decay back to the ground
state,resulting in the emission of light, they are undergoing a
luminescence process
• Generation of excited molecules by light absorption, that then
decay emitting visible light, is photo luminescence
• Photo luminescence processes are divided into 2 classes:
– Fluorescence and Phosphorescence
• Molecules that have an electronic excitation are excited
• Molecules that have a vibration excitation are hot
• With light absorption, molecules may become hot and excited
• Physical process that leads to excited molecules can be
physical(e.g. absorption of light), mechanical (e.g. friction),
or chemical(e.g. reactions)
• When excited molecular states decay back to the ground
state,resulting in the emission of light, they are undergoing a
luminescence process
• Generation of excited molecules by light absorption, that then
decay emitting visible light, is photo luminescence
• Photo luminescence processes are divided into 2 classes:
– Fluorescence and Phosphorescence
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