Room-temperature infrared luminescence with high quantum yield (48%) has be
en observed from HgTe nanocrystals. The colloidal preparation, reported for
the first time, gave rise to nanocrystals of size 3 to 6 nm with coloradoi
te structure. The thiol-capped quantum dots. precipitated as a white powder
from the colloidal solution with 2-propanol, and readily redissolved in wa
ter, are stable towards oxidation and display luminescence covering the 1.3
mu m telecommunications fiber window.