Published January 1, 2014
| Version v1
Journal article
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Study of exciton transfer in dense quantum dot nanocomposites
Creators
- 1. Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA
- 2. Nanyang Technol Univ, Luminous Ctr Excellence Semicond Lighting & Displ, Sch Elect & Elect Engn, Sch Phys & Math Sci, Singapore 639798, Singapore
Description
Nanocomposites of colloidal quantum dots (QDs) integrated into conjugated polymers (CPs) are key to hybrid optoelectronics, where engineering the excitonic interactions at the nanoscale is crucial. For such excitonic operation, it was believed that exciton diffusion is essential to realize nonradiative energy transfer from CPs to QDs. In this study, contrary to the previous literature, efficient exciton transfer is demonstrated in the nanocomposites of dense QDs, where exciton transfer can be as efficient as 80% without requiring the assistance of exciton diffusion. This is enabled by uniform dispersion of QDs at high density (up to similar to 70 wt%) in the nanocomposite while avoiding phase segregation. Theoretical modeling supports the experimental observation of weakly temperature dependent nonradiative energy transfer dynamics. This new finding provides the ability to design hybrid light-emitting diodes that show an order of magnitude enhanced external quantum efficiencies.
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