How do you define "efficiency in photocatalysis" and "charge separation efficiency?"

Thank you for your reply, Yurii V Geletii . Generally, for example, TiO2/Pt, the Pt is employed as a co-catalyst. In this system, the presence of Pt will help the charge separation efficiency. My question is whether the PL lifespan has a direct relationship with the charge separation efficiency. I checked a lot of papers, there are two totally different explanations.

Thanks for your answer, Claudio Imparato . In the beginning, I was also thinking the same. However, I was confused after reading the reported papers. If all the experiment results are true, does that means the PL lifetime could not directly give the conclusion? I also check some papers, they use τ1 and τ2 to explain the result. Article An Inorganic/Organic S‐Scheme Heterojunction H2‐Production P...

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I checked more papers, and it seems the percentage of τ1 (radioactive process), τ2 (non-radioactive step), and τ3 (energy transfer) is an advanced method in explaining the relationship between the lifetime and charge separation efficiency. I will check it and give the feedback later.

I am looking forward to reading other answers.

Dear Ying Yulong应玉龙

You did not answer my questions. Before discussing any problem, we must clearly explain the meaning of each term and how is measured. What is efficiency and how you measure it? If there are no values, how we can say better or worse?

Yours : "I will check it and give the feedback later." You had to check it before posting a question.

Sorry, but from my point of view your question is not professionally formulated.

Photoluminescence is an emission of light caused by absorption of photon. Fluorescence is the property of material to absorb light of short wavelength and emit light of longer wavelength. "The fluorescence lifetime is the characteristic time that a molecule remains in its excited state before returning to the ground state" (from https://www.sciencedirect.com/topics/chemistry/fluorescence-lifetime). Charge separation is the building of space between particles of opposite charges.

You combined the strictly defined terminology with those which are not defined at all ("efficiency"). In addition, you provide eight references, which we are obliged to read to answer you. Too much job for me to continue the discussion.

Dear Yurii V Geletii

My apologies for my question but it is difficult to pick up the relevant figures and data from the reference I gave. Therefore, I give a brief summary of the reported papers about the photoluminescence lifetime which is marked in bold in the question.

Currently, I just read the literature on photoluminescence lifetime in the photocatalysis field and find these two conflicting results. (I) The shorter the lifetime is, the better charge separation efficiency is. (II) The longer the lifetime, the better charge separation efficiency is.

I got confused. Hence, I am looking for some researchers working in this field who could share some general opinions.

Anyway, I still very much appreciate your effort and time.