We present a flexible method for multiplexed color encoded nanospheres (MENs) encapsulating layers of different color quantum dots. Our method results in highly efficient photoluminescent nanospheres with monodisperse, photostable, and excellent luminescence properties.
![Multiplexed color encoded silica nanospheres prepared by stepwise encapsulating quantum dot/SiO2 multilayers](https://www.iciq.org/wp-content/uploads/2014/03/Multiplexed-color-encoded_7071.gif)