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Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: Exploring on January 28, 2019, 08:07:33 AM

Title: what is the purpose of measuring the quatum yield?
Post by: Exploring 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
Title: Re: what is the purpose of measuring the quatum yield?
Post by: Babcock_Hall on January 28, 2019, 03:25:32 PM
Have you looked into photosynthesis at all?
Title: Re: what is the purpose of measuring the quatum yield?
Post by: wildfyr on January 28, 2019, 09:23:44 PM
It helps us gauge how efficient photoreaction is.
Title: Re: what is the purpose of measuring the quantum yield?
Post by: Enthalpy 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.
Title: Re: what is the purpose of measuring the quatum yield?
Post by: Exploring 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.