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Coating CdTe nanocrystals (NCs) with a hybrid SiO 2 shell with CdS-like clusters drastically increased their photoluminescence (PL) efficiency and substantially red-shifted their PL peak. The coating was done either by a two-step synthesis including a sol-gel process and a subsequent reflux with a short reaction time or by a sol–gel procedure with a long reaction time at room temperature....
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