Open AccessPhotoluminescence Enhancement, Blinking Suppression, and Improved Biexciton Quantum Yield of Single Quantum Dots in Zero Mode Waveguides
Author(s) -
Abdullah Al Masud,
Md. Shamsul Arefin,
Fatema Fairooz,
Xu Fu,
Faruk H. Moonschi,
Bernadeta Srijanto,
Khaga R Neupane,
Surya P. Aryal,
Rosemary L. Calabro,
Doo Young Kim,
C. Patrick Collier,
Mustafa H. Chowdhury,
Christopher I. Richards
Publication year - 2021
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/acs.jpclett.1c00450
Subject(s) - biexciton , quantum dot , photoluminescence , quantum yield , materials science , exciton , optoelectronics , spontaneous emission , purcell effect , molecular physics , laser , physics , condensed matter physics , optics , fluorescence
The capability of quantum dots to generate both single and multiexcitons can be harnessed for a wide variety of applications, including those that require high optical gain. Here, we use time-correlated photoluminescence (PL) spectroscopy to demonstrate that the isolation of single CdSeTe/ZnS core-shell, nanocrystal quantum dots (QDs) in Zero Mode Waveguides (ZMWs) leads to a significant modification in PL intensity, blinking dynamics, and biexciton behavior. QDs in aluminum ZMWs (AlZMWs) exhibited a 15-fold increase in biexciton emission, indicating a preferential enhancement of the biexciton radiative decay rate as compared to the single exciton rate. The increase in biexciton behavior was accompanied by a decrease in blinking events due to a shortening in the dark state residence time. These results indicate that plasmon mediated enhanced decay rates of QDs in AlZMWs lead to substantial changes in the photophysical properties of single quantum dots, including an increase in biexciton behavior.