If you use a quantum dot consisting of one semiconductor, for example cadmium selenide, then the ratio of cadmium to selenium will be constant. If you use quantum dots of the core-shell type, when CdSe core is coated with, for example, cadmium sulfide, and then zinc sulfide, then the ratio of these substances will of course affect the quantum yield and fluorescence intensity.
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If you use a quantum dot consisting of one semiconductor, for example cadmium selenide, then the ratio of cadmium to selenium will be constant. If you use quantum dots of the core-shell type, when CdSe core is coated with, for example, cadmium sulfide, and then zinc sulfide, then the ratio of these substances will of course affect the quantum yield and fluorescence intensity.