If {HEAD ~ the semiconductor nanocrystals} are composed of {TAIL ~ two or more compounds}, it may be a uniformly mixed type, gradiently mixed type, core shell type or ally type 
If { HEAD ~ the semiconductor nanocrystals } are composed of { TAIL ~ two or more compounds } , it may be a uniformly mixed type , gradiently mixed type , core shell type or ally type
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH