I am doing a test on LED coating for phosphors powder.

I am using an old 310 nm LED which is oxidized, it produces an emission peak at ~430nm and the emission spectrum of my phosphors is in the range of 400-600 nm, there is a spectral overlap between the oxidized part of the LED and my phosphors spectrum.

How can i calculate the quantum efficiency of the phosphors in this experiment? If possible, please give me the formula and explanation

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