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A new class of nanocrystal quantum dot (NQD), the “giant” NQD (g-NQD), was investigated for its potential to address outstanding issues associated with the use of NQDs as down-conversion phosphors in light-emitting devices, namely, insufficient chemical/photostability and extensive self-reabsorption when packed in high densities or in thick films. Here, we demonstrate that g-NQDs afford significantly enhanced operational stability compared to their conventional NQD counterparts and minimal self-reabsorption losses. The latter results from a characteristic large Stokes shift (>100 nm; >0.39 eV), which itself is a manifestation of the internal structure of these uniquely thick-shelled NQDs. In carefully prepared g-NQDs, light absorption occurs predominantly in the shell but emission occurs exclusively from the core. We directly compare for the first time the processes of shell→core energy relaxation and core→core energy transfer by evaluating CdS→CdSe down-conversion of blue→red light in g-NQDs and in a com...
| Authors: | Janardan Kundu; Yagnaseni Ghosh; Allison M. Dennis; Han Htoon; Jennifer A. Hollingsworth | |
| Journal: | Nano Letters | |
| Year: | 2012 | |
| DOI: | 10.1021/nl3008659 | |
| Publication date: | 18-05-2012 |
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