The energy difference between the maximum of {HEAD ~ the gain} and the emission maximum decreases with {TAIL ~ decreasing size} of the nanocrystal 
The energy difference between the maximum of { HEAD ~ the gain } and the emission maximum decreases with { TAIL ~ decreasing size } of the nanocrystal
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH