## How is quantum efficiency calculated?

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To calculate the QE it is necessary to use some basic physical relations:

- Current in ampere is really just some number of charge carriers (electrons) per second.
- Light energy in watt is some number of photons per second, but the number of photons varies with how much energy each photon carries.

### Is quantum yield and quantum efficiency the same?

Please note that quantum yield refers to events/photons emitted per events/photons absorbed while quantum efficiency refers to energy, i.e. energy out/energy in.

**How do you calculate quantum efficiency from responsivity?**

where h ν is the photon energy, η is the quantum efficiency, and e the elementary charge. For example, a silicon photodiode with 90% quantum efficiency at a wavelength of 800 nm, the responsivity would be ≈ 0.58 A/W….

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**What is fluorescence quantum yield and how do you calculate it?**

Fluorescence quantum yield can be measured using two methods: the absolute method and the relative method. Relative ΦF measurements are achieved using the comparative method. Here, the ΦF of a sample is calculated by comparing its fluorescence intensity to another sample of known ΦF (the reference).

## How do you calculate quantum efficiency?

### How do you calculate the quantum efficiency of a reaction?

The formula is: QE= 2 (number of evolved hydrogen molecules) / number of incident photons.

**How do you calculate internal quantum efficiency?**

IQE = EQE/(1-R) . IQE tells you about the fraction of absorbed photons that are being converted to electrons in the device.

**How do you calculate apparent quantum yield?**

Apparent quantum yield (%) = [number of reacted electrons or holes]/[number of incident photons] · 100 = [number of H2 molecules evolved · 2]/[number of incident photons] · 100.