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Topic: what is the purpose of measuring the quatum yield?  (Read 661 times)

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Offline Exploring

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what is the purpose of measuring the quatum yield?
« on: January 28, 2019, 08:07:33 AM »
I have seen in many papers the measurement of the QUANTUM YIELD. However, I do not see what is the practical use of it. Any suggestion?
thanks

Offline Babcock_Hall

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Re: what is the purpose of measuring the quatum yield?
« Reply #1 on: January 28, 2019, 03:25:32 PM »
Have you looked into photosynthesis at all?

Offline wildfyr

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Re: what is the purpose of measuring the quatum yield?
« Reply #2 on: January 28, 2019, 09:23:44 PM »
It helps us gauge how efficient photoreaction is.

Offline Enthalpy

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Re: what is the purpose of measuring the quantum yield?
« Reply #3 on: January 29, 2019, 10:19:25 AM »
In many cases, the quantum yield is the hard limit, hence it tells you, better than a power yield for instance, how far a process is from the best possible yield. This makes it also a tool for understanding.

Take for instance visible light on a silicon photodetector. You get almost on electron photocurrent per incident photon, which is the limit. It explains you why amps of photocurrent per watt of light drop at shorter wavelength: just because a joule of blue light contains fewer photons than with green light. Having checked the quantum yield, you know that competitor detectors working similarly won't do better.

Offline Exploring

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Re: what is the purpose of measuring the quatum yield?
« Reply #4 on: January 30, 2019, 04:35:41 AM »
thanks a lot for the answers, especially to Enthalpy.
I  know what is about. 
However, in real industrial examples, I was not sure how important is that measurement, and how to compare among samples.


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