Quantum dots — is a nano-crystals of semiconducting matetial. It’s size could vary from single nanometer to few tens of nanometers, what makes them possess quantum-mechanical properties like a single molecules. Quantum dots have an uncommon fluorescence properties too: with a wide excitation spectrum, their fluorescence peak position strongly depends on it’s size: bigger nano-crystal emits reder light. Quantum dots much more lightfast, then organic dues, that makes their use perspective in many science and technical issues, like fluorescent probes in medicine and biology. [1]

Process of quantum dot creation usually consists of covering nano-crystal (core) with 1—3 atomic layer if insulation cover (shell), that raises quantum yield to 70%. Covered with shell nano-crystalls could be funcionalised with different organic molecules for solubilisation in different solvents or tie them to other molecules, for as example their visualization invivo. [2]

Quantum dots could be utilised in photobiology as light-harvesting complexes for photosynthetic reaction centers, as they collect light much more efficient then natural light antennas do. So, in theory, they could raise efficiency of primary photosynthetic stages in several times. [3]

On this illustration presented scheme of interaction between purple bacteria (Rb. sphaeroides) reaction center, integrated in liposome membrane, and quantum dots (CdSe core and ZnS shell), that is situated inside liposome or integrated in membrane, but without organic cover (PEG).