Basics on molecular electronic states. Electronic absorption. Fluorescence and phosphorescence, delayed fluorescence.
Understand the Problem
The question is asking for an explanation of the fundamental concepts related to molecular electronic states, including electronic absorption, fluorescence, phosphorescence, and delayed fluorescence. This involves understanding how molecules absorb energy and the subsequent phenomena resulting from this energy transition.
Answer
Fluorescence emits light immediately after absorption, phosphorescence does so after a delay.
Fluorescence and phosphorescence are molecular luminescence methods where a molecule absorbs light and then emits it at longer wavelengths. Fluorescence occurs rapidly (within nanoseconds), while phosphorescence involves longer-lived excited states due to a spin change, causing delayed emission.
Answer for screen readers
Fluorescence and phosphorescence are molecular luminescence methods where a molecule absorbs light and then emits it at longer wavelengths. Fluorescence occurs rapidly (within nanoseconds), while phosphorescence involves longer-lived excited states due to a spin change, causing delayed emission.
More Information
Fluorescence and phosphorescence are part of luminescence processes. In fluorescence, energy is released and emitted immediately after light absorption. Whereas phosphorescence features a delay in light emission due to electron spin changes, releasing energy more slowly.
Tips
A common mistake is confusing fluorescence and phosphorescence as identical; they differ in their timing and electronic states involved.
Sources
- Fluorescence and Phosphorescence - Chemistry LibreTexts - chem.libretexts.org
- Basic Concepts in Fluorescence - Olympus Life Science - olympus-lifescience.com
- Fluorescence and Phosphorescence - Ossila - ossila.com
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