Abstract
Materials for studying biological interactions and for alternative energy applications are continuously under development. Semiconductor quantum dots are a major part of this landscape due to their tunable optoelectronic properties. Size-dependent quantum confinement effects have been utilized to create materials with tunable bandgaps and Auger recombination rates. Other mechanisms of electronic structural control are under investigation as not all of a material's characteristics are affected by quantum confinement. Demonstrated here is a new structure-property concept that imparts the ability to spatially localize electrons or holes within a core/shell heterostructure by tuning the charge carrier's kinetic energy on a parabolic potential energy surface. This charge carrier separation results in extended radiative lifetimes and in continuous emission at the single-nanoparticle level. These properties enable new applications for optics, facilitate novel approaches such as time-gated single-particle imaging, and create inroads for the development of other new advanced materials.
Original language | English (US) |
---|---|
Pages (from-to) | 9470-9476 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 22 |
Issue number | 23 |
DOIs | |
State | Published - Dec 14 2022 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- Mechanical Engineering
- Bioengineering
- General Materials Science
Keywords
- Auger recombination
- blinking suppression
- emission intermittency
- quantum dots
- semiconductor heterostructure
- type II