Quantum Yield
| Formula / Notation | Φ = events / photons absorbed |
|---|---|
| Also Known As | Photochemical quantum yield, fluorescence quantum yield, Φ, photon efficiency |
What is Quantum Yield?
Quantum yield (Φ) is the ratio of the number of events (photons emitted, molecules reacted, electrons produced) to the number of photons absorbed. In photochemistry, it measures the efficiency of a photochemical reaction. In fluorescence, it is the fraction of absorbed photons that result in fluorescent emission. A quantum yield of 1 means every absorbed photon produces one event.
Formula & Notation
Other Names / Synonyms: Photochemical quantum yield, fluorescence quantum yield, Φ, photon efficiency
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Quantum yield (Φ) is the ratio of the number of events (photons emitted, molecules reacted, electrons produced) to the number of photons absorbed. In photochemistry, it measures the efficiency of a photochemical reaction. In fluorescence, it is the fraction of absorbed photons that result in fluorescent emission. A quantum yield of 1 means every absorbed photon produces one event.
Fluorescent dye selection for microscopy and sensing. Photovoltaic cell efficiency. Photosynthesis efficiency measurement. Photocatalysis optimization. Photographic film sensitivity. LED efficiency. Phototherapy dosimetry. Atmospheric photochemical modeling.
Photochemical reactions may involve UV/visible radiation hazards. High quantum yield photoreactions can proceed rapidly. Some photochemical products may be toxic.
The formula or notation for Quantum Yield is: Φ = events / photons absorbed