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Parabolic Potential Surfaces Localize Charge Carriers in Nonblinking Long-Lifetime “Giant” Colloidal Quantum Dots

2022; American Chemical Society; Volume: 22; Issue: 23 Linguagem: Inglês

10.1021/acs.nanolett.2c03563

1530-6992

Marcell Pálmai, Joseph S. Beckwith, Nyssa T. Emerson, Tian Zhao, Eun Byoel Kim, Shuhui Yin, Prakash Parajuli, Kyle Tomczak, Kai Wang, Bibash Sapkota, Ming Tien, Nan Jiang, Robert F. Klie, Haw Yang, Preston T. Snee,

Gold and Silver Nanoparticles Synthesis and Applications

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.