Disentangling the effects of clustering and multi-exciton emission in second-order photon correlation experiments.
Opt Express
; 21(6): 7419-26, 2013 Mar 25.
Article
em En
| MEDLINE
| ID: mdl-23546125
ABSTRACT
In single particle spectroscopy, the degree of observed fluorescence anti-bunching in a second-order cross correlation experiment is indicative of its bi-exciton quantum yield and whether or not a particle is well isolated. Advances in quantum dot synthesis have produced single particles with bi-exciton quantum yields approaching unity. Consequently, this creates uncertainty as to whether a particle has a high bi-exciton quantum yield or if it exists as a cluster. We report on a time-gated anti-bunching technique capable of determining the relative contributions of both multi-exciton emission and clustering effects. In this way, we can now unambiguously determine if a particle is single. Additionally, this time-gated anti-bunching approach provides an accurate way for the determination of bi-exciton lifetime with minimal contribution from higher order multi-exciton states.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotometria
/
Espectrometria de Fluorescência
/
Modelos Teóricos
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article