Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution

doi:10.1088/1674-1056/28/5/057803

Abstract

We investigated the optical properties of hybrid exciton-plasmon coupling ensembles composed of ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution. We modulated their average interval by changing the ratio of quantum dots and Ag nanoparticles. The transition from dramatic PL enhancement to PL quenching state was experimentally observed, according to the continuous decrease of the PL lifetime. The PL enhancement rate exceeded 10, with the Purcell factor of 3.5. Meanwhile, the proportion of fast decay increased from 0.3 to 0.6, corresponding to the proportion of slow decay decreased from 0.7 to 0.4. Our experiment is important for the hybrid exciton-plasmon coupling system to be practicable in optoelectronic application.

Keywords: ZnSe/ZnS quantum dots enhancement and quenching localized surface plasmons aqueous solution

Received: 10 January 2019
Revised: 20 February 2019
Accepted manuscript online:

PACS:	78.55.Et	(II-VI semiconductors)
	68.65.Hb	(Quantum dots (patterned in quantum wells))
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)

Fund:

Project supported by the National Key R&D Program of China (Grant No. 2018YFA0306304) and the National Natural Science Foundation of China (Grant No. 11674069).

Corresponding Authors: Zhanghai Chen
E-mail: zhanghai@fudan.edu.cn

Cite this article:

Shaoyi Yin(殷少轶), Liming Liao(廖李明), Song Luo(罗松), Zhe Zhang(张喆), Xiaoyu Zhang(张晓宇), Jian Lu(鹿建), Zhanghai Chen(陈张海) Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution 2019 Chin. Phys. B 28 057803

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Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution

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