Dramatic Decrease Of Joule Losses In The Coupling Between A Crystalline Gold Film And Single Colloidal Cdse/Cds Nanocrystals At 4 K

We study the coupling of colloidal thick-shell CdSe/CdS nanocrystals with amorphous gold films (AFs) and crystalline gold platelets (CPs) at 4 K. Time resolved experiments show that the photoluminescence lifetime increases from 2.4 ns (AF) to 5.1 ns (CP) due to the reduction of Joule losses. The comparison of the experimental results with numerical predictions shows that the radiative quantum efficiency is at least twice higher (>= 20%) for the crystalline structure.