通过等离子体纳米结构增强InP/ZnSe/ZnSeS/ZnS量子点的光稳定性

Photostability enhancement of InP/ZnSe/ZnSeS/ZnS quantum dots by plasmonic nanostructures.

作者信息

Kulakovich O, Gurinovich L, Li Hui, Ramanenka A, Trotsiuk L, Muravitskaya A, Wei Jing, Li Hongbo, Matveevskaya N, Guzatov D V, Gaponenko S

机构信息

B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimosti Ave, Minsk 220072, Belarus.

Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 10008,1 People's Republic of China.

出版信息

Nanotechnology. 2021 Jan 15;32(3):035204. doi: 10.1088/1361-6528/abbdde.

DOI:10.1088/1361-6528/abbdde

PMID:33007765

Abstract

The effect of gold and silver plasmonic films on the photoluminescence and photostability of InP/ZnSe/ZnSeS/ZnS nanocrystals (quantum dots) is reported. Colloidal gold films promote the photostability enhancement of InP/ZnSe/ZnSeS/ZnS quantum dots (more durable emission properties in the presence of metal nanostructures) through reducing exciton lifetime. In contrast, silver decreases the photostability of InP/ZnSe/ZnSeS/ZnS quantum dots without changing the photoluminescence intensity and kinetics. By adjusting the excitation wavelength closer to the extinction band of gold nanoparticles a 1.8-fold enhancement of luminescence intensity has been obtained using a polyelectrolyte spacer between the metal and InP/ZnSe/ZnSeS/ZnS nanoparticles. Thus, plasmonics offers essential practical improvement of light emitters in terms of their durable luminescent properties upon prolonged optical excitation without losses in luminescence efficiency or even along with increased efficiency.

摘要

报道了金和银等离子体薄膜对InP/ZnSe/ZnSeS/ZnS纳米晶体（量子点）光致发光和光稳定性的影响。胶体金薄膜通过缩短激子寿命促进InP/ZnSe/ZnSeS/ZnS量子点的光稳定性增强（在金属纳米结构存在下具有更持久的发射特性）。相比之下，银在不改变InP/ZnSe/ZnSeS/ZnS量子点光致发光强度和动力学的情况下降低其光稳定性。通过将激发波长调整到更接近金纳米颗粒的消光带，在金属与InP/ZnSe/ZnSeS/ZnS纳米颗粒之间使用聚电解质间隔层，发光强度提高了1.8倍。因此，等离子体激元学在长时间光激发下，在发光体的持久发光特性方面提供了实质性的实际改进，不会损失发光效率，甚至效率会提高。