Local field effect on luminescent properties of organic molecule-doped silica nanoparticles

Anjun Huang; Ka Leung Wong; Peter A. Tanner

doi:10.1016/j.omx.2021.100073

Local field effect on luminescent properties of organic molecule-doped silica nanoparticles

Anjun Huang, Ka Leung Wong^*, Peter A. Tanner^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

Abstract

The local field effect involves the modification of the spontaneous emission rate of an emitting center in a nanoparticle (NP) due to its environment which modifies the photon density of states and the electric field acting within the NP. We are unaware of reports of this effect for organic molecules so that we encapsulated a green dye and a porphyrin in a silica shell and dispersed these in media of different refractive index. The emission decays were monoexponential so that the calculated lifetimes could be fitted by a model recently employed for the local field effect. It was found that a good fit was achieved for the smaller NPs employed, indicating the importance of the effect, but the effect was not important for the larger NPs where different behavior was observed due to agglomeration.

Original language	English
Article number	100073
Number of pages	6
Journal	Optical Materials: X
Volume	10
DOIs	https://doi.org/10.1016/j.omx.2021.100073
Publication status	Published - May 2021

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Spectroscopy
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Electrical and Electronic Engineering

User-Defined Keywords

Chemical interaction
HPTS
Local field effect
Silica coating

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10.1016/j.omx.2021.100073

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title = "Local field effect on luminescent properties of organic molecule-doped silica nanoparticles",

abstract = "The local field effect involves the modification of the spontaneous emission rate of an emitting center in a nanoparticle (NP) due to its environment which modifies the photon density of states and the electric field acting within the NP. We are unaware of reports of this effect for organic molecules so that we encapsulated a green dye and a porphyrin in a silica shell and dispersed these in media of different refractive index. The emission decays were monoexponential so that the calculated lifetimes could be fitted by a model recently employed for the local field effect. It was found that a good fit was achieved for the smaller NPs employed, indicating the importance of the effect, but the effect was not important for the larger NPs where different behavior was observed due to agglomeration.",

keywords = "Chemical interaction, HPTS, Local field effect, Silica coating",

author = "Anjun Huang and Wong, {Ka Leung} and Tanner, {Peter A.}",

note = "Funding Information: K.-L.W acknowledges financial support from the Durham- HKBU joint laboratory and the Staff Development Fund from HKBU , SDF19-1011-P02; Dr. Mok Man Hung Endowed Professor in Chemistry from HKBU; and Hong Kong Research Grants Council grant HKBU 12300320 . Funding Information: K.-L.W acknowledges financial support from the Durham-HKBU joint laboratory and the Staff Development Fund from HKBU, SDF19-1011-P02; Dr. Mok Man Hung Endowed Professor in Chemistry from HKBU; and Hong Kong Research Grants Council grant HKBU 12300320. Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2021",

month = may,

doi = "10.1016/j.omx.2021.100073",

language = "English",

volume = "10",

journal = "Optical Materials: X",

issn = "2590-1478",

publisher = "Elsevier BV",

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AU - Huang, Anjun

AU - Wong, Ka Leung

AU - Tanner, Peter A.

N1 - Funding Information: K.-L.W acknowledges financial support from the Durham- HKBU joint laboratory and the Staff Development Fund from HKBU , SDF19-1011-P02; Dr. Mok Man Hung Endowed Professor in Chemistry from HKBU; and Hong Kong Research Grants Council grant HKBU 12300320 . Funding Information: K.-L.W acknowledges financial support from the Durham-HKBU joint laboratory and the Staff Development Fund from HKBU, SDF19-1011-P02; Dr. Mok Man Hung Endowed Professor in Chemistry from HKBU; and Hong Kong Research Grants Council grant HKBU 12300320. Publisher Copyright: © 2021 The Authors

PY - 2021/5

Y1 - 2021/5

N2 - The local field effect involves the modification of the spontaneous emission rate of an emitting center in a nanoparticle (NP) due to its environment which modifies the photon density of states and the electric field acting within the NP. We are unaware of reports of this effect for organic molecules so that we encapsulated a green dye and a porphyrin in a silica shell and dispersed these in media of different refractive index. The emission decays were monoexponential so that the calculated lifetimes could be fitted by a model recently employed for the local field effect. It was found that a good fit was achieved for the smaller NPs employed, indicating the importance of the effect, but the effect was not important for the larger NPs where different behavior was observed due to agglomeration.

AB - The local field effect involves the modification of the spontaneous emission rate of an emitting center in a nanoparticle (NP) due to its environment which modifies the photon density of states and the electric field acting within the NP. We are unaware of reports of this effect for organic molecules so that we encapsulated a green dye and a porphyrin in a silica shell and dispersed these in media of different refractive index. The emission decays were monoexponential so that the calculated lifetimes could be fitted by a model recently employed for the local field effect. It was found that a good fit was achieved for the smaller NPs employed, indicating the importance of the effect, but the effect was not important for the larger NPs where different behavior was observed due to agglomeration.

KW - Chemical interaction

KW - HPTS

KW - Local field effect

KW - Silica coating

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U2 - 10.1016/j.omx.2021.100073

DO - 10.1016/j.omx.2021.100073

M3 - Journal article

AN - SCOPUS:85108610021

SN - 2590-1478

VL - 10

JO - Optical Materials: X

JF - Optical Materials: X

M1 - 100073

ER -

Local field effect on luminescent properties of organic molecule-doped silica nanoparticles

Abstract

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