A method for improving the long term stability of nano-crystalline semiconductors in an exterior enviroment

摘要

A medium is provided in which nano-crystalline semiconductors or quantum dots are stable for extended periods when subjected to exterior lighting. The colour emission of the resultant quantum dots provides a fingerprint which is still effective after one year of exposure to exterior conditions. Such encapsulation protects the quantum dots in exterior conditions, so that they may be used as pigments or coding systems based on their optical emission.