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Size- and temperature-dependent carrier dynamics in oleic acid capped PbS quantum dots

Size- and temperature-dependent carrier dynamics in oleic acid capped PbS quantum dots
Size- and temperature-dependent carrier dynamics in oleic acid capped PbS quantum dots
In this work, we investigate the temperature dependence of the photoluminescence decay and integrated photoluminescence of oleic acid capped PbS quantum dots with diameters ranging from 2.3 to 3.5 nm over a broad temperature range (6–290 K). All the investigated samples exhibit similar behavior, consisting of three different temperature regimes. The low-temperature regime (<180 K) is characterized by an increase in the average decay rate and a decrease in integrated photoluminescence. The intermediate regime (∼180–250 K) is described by an enhancement in the photoluminescence intensity and a decrease in the average decay rate. The high-temperature regime (>250 K) is governed by quenched photoluminescence intensity and acceleration in the average lifetimes. We propose a three-level system, composed of bright, dark, and surface states, which describes the observed photoluminescence dynamics of oleic acid capped PbS QDs.
1932-7447
1887-1892
Andreakou, Peristera
9a6d6dea-bb9a-46e1-b50b-b200bcfd5b6c
Brossard, Mael
8081f6a5-50c8-419c-9c97-1fccbee48bda
Li, Chunyong
478eecf5-1e61-4bd1-8c2b-f37d80f03880
Bernechea, Maria
2c5a44ab-32fe-4d11-9a4d-3311c5979dab
Konstantatos, Gerasimos
8cb31950-5fdd-42e9-9b0a-5669356c6826
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Andreakou, Peristera
9a6d6dea-bb9a-46e1-b50b-b200bcfd5b6c
Brossard, Mael
8081f6a5-50c8-419c-9c97-1fccbee48bda
Li, Chunyong
478eecf5-1e61-4bd1-8c2b-f37d80f03880
Bernechea, Maria
2c5a44ab-32fe-4d11-9a4d-3311c5979dab
Konstantatos, Gerasimos
8cb31950-5fdd-42e9-9b0a-5669356c6826
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Andreakou, Peristera, Brossard, Mael, Li, Chunyong, Bernechea, Maria, Konstantatos, Gerasimos and Lagoudakis, Pavlos G. (2013) Size- and temperature-dependent carrier dynamics in oleic acid capped PbS quantum dots. The Journal of Physical Chemistry C, 117 (4), 1887-1892. (doi:10.1021/jp3054108).

Record type: Article

Abstract

In this work, we investigate the temperature dependence of the photoluminescence decay and integrated photoluminescence of oleic acid capped PbS quantum dots with diameters ranging from 2.3 to 3.5 nm over a broad temperature range (6–290 K). All the investigated samples exhibit similar behavior, consisting of three different temperature regimes. The low-temperature regime (<180 K) is characterized by an increase in the average decay rate and a decrease in integrated photoluminescence. The intermediate regime (∼180–250 K) is described by an enhancement in the photoluminescence intensity and a decrease in the average decay rate. The high-temperature regime (>250 K) is governed by quenched photoluminescence intensity and acceleration in the average lifetimes. We propose a three-level system, composed of bright, dark, and surface states, which describes the observed photoluminescence dynamics of oleic acid capped PbS QDs.

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More information

e-pub ahead of print date: 4 December 2012
Published date: 31 January 2013

Identifiers

Local EPrints ID: 430550
URI: http://eprints.soton.ac.uk/id/eprint/430550
ISSN: 1932-7447
PURE UUID: be39df41-e143-48d5-9b86-ffb816868d7d

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Date deposited: 03 May 2019 16:30
Last modified: 03 May 2019 16:30

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Contributors

Author: Peristera Andreakou
Author: Mael Brossard
Author: Chunyong Li
Author: Maria Bernechea
Author: Gerasimos Konstantatos

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