Fluorescence Lifetime  Infinite, No quenching or photobleaching Fluorescence is size-independent 
Fluorescence intermittency None, no blinking 
Surface functionalization  Excellent surface chemistry allows attachment of proteins & antibodies to the surfaces, Eliminates non-specific binding 
Temperature Tolerates >1000 °C 
Pressure Withstands excess of 600 GigaPascals 
Laser Tolerates gigawatt laser, resistant to radiation 
Particle stability Stable in all aqueous solutions, at any pH 
Biocompatibility Non-toxic
Mixtures Homogeneous mixtures with other solids 
Imaging Capability  Subsurface detectable, permitting real-time, in vivo monitoring and real-time cell tracking
Size  Particle sizes from 50 nm to several micron available