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Further studies of radiation trapping in Er3+ doped chalcogenide glasses

Further studies of radiation trapping in Er3+ doped chalcogenide glasses
Further studies of radiation trapping in Er3+ doped chalcogenide glasses
Absorption and emission bands in trivalent erbium ions Er3+ are known to strongly overlap, which means that in heavily doped samples, it is possible to observe the effects of sequential radiation absorption and re-emission processes that involve the Er3+ ions. In particular, this effect of “radiation trapping” (RT) or “radiation/ excitation diffusion” is responsible for the dependence of the measured photoluminescence (PL) lifetime and PL spectrum shape in Er3+ chalcogenide glasses on the rare-earth doping concentration and sample size.[1,2]. It is worth mentioning here that the original name “excitation diffusion” originates from Milne’s paper where he pointed out the formal similarity of equations describing the effect with those for normal diffusion [3].In present paper we present the results of experiments which are design to maximize the effect of RT by passing the light along the bulk of a chalcogenide glass sample as shown in Figure 1 (b-d). We carry out experiments on samples having regular cylindrical shape, which allows us to do some simple calculations predicting the shape and lifetime of PL (see Equations (1-3) in Figure 1). The results of these predictions appear to be in a very good agreement with experimental data as shown in Figure 1(a). These results show that RT effectively “stirs” the excitation inside of sample, evenly distributing it throughout the whole volume of the sample.&more...
Koughia, Cyril
f1e20fa6-6675-488a-9db7-8cfc7e9300e3
Craig, Christopher
2328b42b-552e-4a82-941d-45449e952f10
Hewak, Daniel
87c80070-c101-4f7a-914f-4cc3131e3db0
Kasap, Safa
4b1e6486-5957-4c45-94f9-154b0c693b91
Koughia, Cyril
f1e20fa6-6675-488a-9db7-8cfc7e9300e3
Craig, Christopher
2328b42b-552e-4a82-941d-45449e952f10
Hewak, Daniel
87c80070-c101-4f7a-914f-4cc3131e3db0
Kasap, Safa
4b1e6486-5957-4c45-94f9-154b0c693b91

Koughia, Cyril, Craig, Christopher, Hewak, Daniel and Kasap, Safa (2017) Further studies of radiation trapping in Er3+ doped chalcogenide glasses. Photoluminescence in Rare Earths: Photonic Materials and Devices (PRE'17), Rome, Italy. 30 Nov - 02 Dec 2017.

Record type: Conference or Workshop Item (Other)

Abstract

Absorption and emission bands in trivalent erbium ions Er3+ are known to strongly overlap, which means that in heavily doped samples, it is possible to observe the effects of sequential radiation absorption and re-emission processes that involve the Er3+ ions. In particular, this effect of “radiation trapping” (RT) or “radiation/ excitation diffusion” is responsible for the dependence of the measured photoluminescence (PL) lifetime and PL spectrum shape in Er3+ chalcogenide glasses on the rare-earth doping concentration and sample size.[1,2]. It is worth mentioning here that the original name “excitation diffusion” originates from Milne’s paper where he pointed out the formal similarity of equations describing the effect with those for normal diffusion [3].In present paper we present the results of experiments which are design to maximize the effect of RT by passing the light along the bulk of a chalcogenide glass sample as shown in Figure 1 (b-d). We carry out experiments on samples having regular cylindrical shape, which allows us to do some simple calculations predicting the shape and lifetime of PL (see Equations (1-3) in Figure 1). The results of these predictions appear to be in a very good agreement with experimental data as shown in Figure 1(a). These results show that RT effectively “stirs” the excitation inside of sample, evenly distributing it throughout the whole volume of the sample.&more...

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Published date: 30 November 2017
Venue - Dates: Photoluminescence in Rare Earths: Photonic Materials and Devices (PRE'17), Rome, Italy, 2017-11-30 - 2017-12-02

Identifiers

Local EPrints ID: 417125
URI: http://eprints.soton.ac.uk/id/eprint/417125
PURE UUID: 891e4fcc-ddec-4f47-9c9e-38fc2ff89b18
ORCID for Christopher Craig: ORCID iD orcid.org/0000-0001-6919-4294
ORCID for Daniel Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 19 Jan 2018 17:30
Last modified: 24 May 2019 00:32

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