Photoluminescence Enhancement, Blinking Suppression, and Improved Biexciton Quantum Yield of Single Quantum Dots in Zero Mode Waveguides

被引：10

作者：

Al Masud, Abdullah ^{[1
]}

Arefin, S. M. Nayeem ^{[2
]}

Fairooz, Fatema ^{[2
]}

Fu, Xu ^{[1
]}

Moonschi, Faruk ^{[3
]}

Srijanto, Bernadeta R. ^{[4
]}

Neupane, Khaga Raj ^{[1
]}

Aryal, Surya ^{[1
]}

Calabro, Rosemary ^{[1
]}

Kim, Doo-Young ^{[1
]}

Collier, C. Patrick ^{[4
]}

Chowdhury, Mustafa Habib ^{[2
]}

Richards, Christopher, I ^{[1
]}

机构：

[1] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA

[2] Independent Univ, Dept Elect & Elect Engn, Bangladesh IUB, Dhaka, Bangladesh

[3] Univ Kentucky, Dept Physiol, Lexington, KY 40536 USA

[4] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, POB 2009, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2021年 / 12卷 / 13期

关键词：

PHOTON-EMISSION; FLUORESCENCE ENHANCEMENT; MULTIPHOTON EMISSION; NANOCRYSTALS; ALUMINUM; NANOAPERTURE; MOLECULES; DELIVERY; STATES; FILMS;

D O I：

10.1021/acs.jpclett.1c00450

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：3303 / 3311

页数：9

共 60 条

[1] Multiexcitons confined within a subexcitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals [J].