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

Peristera Andreakou, Mael Brossard, Chunyong Li, Maria Bernechea, Gerasimos Konstantatos, Pavlos G. Lagoudakis

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1887-1892
Number of pages6
JournalJournal of Physical Chemistry C
Volume117
Issue number4
DOIs
Publication statusPublished - 31 Jan 2013
Externally publishedYes

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