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Whispering gallery modes in photoluminescence of ruthenium bipyridine in coated microcavities

Whispering gallery modes in photoluminescence of ruthenium bipyridine in coated microcavities
Whispering gallery modes in photoluminescence of ruthenium bipyridine in coated microcavities

We used the charge transfer (CT) complex of tris (2,2′ bipyridyl) dichloro ruthenium (II) hexahydrate (Ru(bpy)3Cl2.6H2O) (RuCOM), well- characterised in water and in microcrystalline state, to dope or coat the microspheres and study the effect of whispering gallery modes (WGMs) on photoluminescence (PL) spectra and radiative lifetimes. Interestingly, in presence of dissipative quality factor, RuCOM broadens the WGMs when coated than when doped. Theoretical simulations for electric field for a coating of RuCOM on glass microspheres shows evanescent field extending in to the coated layer. The decay rates of RuCOM embedded or coated on microspheres are considerably different from the rates in crystalline RuCOM and the decay has an additional component of short lifetime. The enhancement of decay rate in small microcavities has been assigned to a weak Purcell's effect due to presence of microcrystals.

microcavities, photoluminescence, time resolved spectroscopy, whispering gallery modes
Bhattacharya, Shubhayan
64fa4af8-6833-4075-b4ad-f86b787a656f
Veluthandath, Aneesh V.
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Bisht, Prem B.
9e617371-071b-48b1-9f33-2801ea08cace
Bhattacharya, Shubhayan
64fa4af8-6833-4075-b4ad-f86b787a656f
Veluthandath, Aneesh V.
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Bisht, Prem B.
9e617371-071b-48b1-9f33-2801ea08cace

Bhattacharya, Shubhayan, Veluthandath, Aneesh V. and Bisht, Prem B. (2018) Whispering gallery modes in photoluminescence of ruthenium bipyridine in coated microcavities. Materials Research Express, 5 (12), [126201]. (doi:10.1088/2053-1591/aad5b6).

Record type: Article

Abstract

We used the charge transfer (CT) complex of tris (2,2′ bipyridyl) dichloro ruthenium (II) hexahydrate (Ru(bpy)3Cl2.6H2O) (RuCOM), well- characterised in water and in microcrystalline state, to dope or coat the microspheres and study the effect of whispering gallery modes (WGMs) on photoluminescence (PL) spectra and radiative lifetimes. Interestingly, in presence of dissipative quality factor, RuCOM broadens the WGMs when coated than when doped. Theoretical simulations for electric field for a coating of RuCOM on glass microspheres shows evanescent field extending in to the coated layer. The decay rates of RuCOM embedded or coated on microspheres are considerably different from the rates in crystalline RuCOM and the decay has an additional component of short lifetime. The enhancement of decay rate in small microcavities has been assigned to a weak Purcell's effect due to presence of microcrystals.

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More information

Accepted/In Press date: 25 July 2018
e-pub ahead of print date: 26 September 2018
Published date: 1 December 2018
Keywords: microcavities, photoluminescence, time resolved spectroscopy, whispering gallery modes

Identifiers

Local EPrints ID: 444640
URI: http://eprints.soton.ac.uk/id/eprint/444640
PURE UUID: ada7316a-cb68-485c-b3a4-158bf3ced3b1
ORCID for Aneesh V. Veluthandath: ORCID iD orcid.org/0000-0003-4306-6723

Catalogue record

Date deposited: 28 Oct 2020 17:30
Last modified: 18 Feb 2021 17:41

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