In modern medical analyzes, various types of organic dyes are used. However, as technology develops, the requirements for these pigments increase. Quantum dots, when they were discovered, immediately began to claim this role, as particles exceeding traditional solutions on many points. Due to the unique structure of the core and the shell, the quantum dots have a large quantum yield, a configurable size and a clear spectrum of luminescence. They are 20 times brighter and 100 times more stable than their predecessors.