Nearly Blinking-Free, High-Purity Single-Photon Emission by Colloidal InP/ZnSe Quantum Dots

被引：94

作者：

Chandrasekaran, Vigneshwaran ^{[1
]}

Tessier, Mickael D. ^{[1
]}

Dupont, Dorian ^{[1
]}

Geiregat, Pieter ^{[1
]}

Hens, Zeger ^{[1
]}

Brainis, Edouard ^{[1
]}

机构：

[1] Univ Ghent, Ctr Nano & Biophoton & Phys & Chem Nanostruct, B-9000 Ghent, Belgium

来源：

NANO LETTERS | 2017年 / 17卷 / 10期

基金：

欧盟地平线“2020”;

关键词：

Colloidal quantum dots; single-particle; spectroscopy; single-photon emission; blinking; ROOM-TEMPERATURE; FLUORESCENCE INTERMITTENCY; AUGER RECOMBINATION; NANOCRYSTALS; GENERATION; EFFICIENT; BEHAVIOR;

D O I：

10.1021/acs.nanolett.7b02634

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal core/shell InP/ZnSe quantum dots (QDs), recently produced using an improved synthesis method, have a great potential in life-science applications as well as in integrated quantum photonics and quantum information processing as single-photon emitters. Single particle spectroscopy of 10 nm QDs with 3.2 nm cores reveals strong photon antibunching attributed to fast (70 ps) Auger recombination of multiple excitons. The QDs exhibit very good photostability under strong optical excitation. We demonstrate that the antibunching is preserved when the QDs are excited above the saturation intensity of the fundamental-exciton transition. This result paves the way toward their usage as high-purity on-demand single-photon emitters at room temperature. Unconventionally, despite the strong Auger blockade mechanism, InP/ZnSe QDs also display very little luminescence intermittency ("blinking"), with a simple on/off blinking pattern. The analysis of single-particle luminescence statistics places these InP/ZnSe QDs in the class of nearly blinking free QDs, with emission stability comparable to state-of-the-art thick-shell and alloyed-interface CdSe/CdS, but with improved single-photon purity.

引用

页码：6104 / 6109

页数：6

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