Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F25%3A00617957" target="_blank" >RIV/61388963:_____/25:00617957 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/25:10502260
Result on the web
<a href="https://doi.org/10.1364/OE.543512" target="_blank" >https://doi.org/10.1364/OE.543512</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1364/OE.543512" target="_blank" >10.1364/OE.543512</a>
Alternative languages
Result language
angličtina
Original language name
Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots
Original language description
We investigated the laser power-dependent photoluminescence (PL) decay profiles of oleic-acid capped PbS quantum dots (QDs) in toluene, with a mean size of approximately 2.6 nm, under both long duration (LD) and short duration (SD) excitation pulse limits. The absorption cross-section (ACS) of PbS QDs was assessed and compared using two approaches: power-modulated PL kinetics and fitting of PL amplitude saturation curves. Traditionally, the moderate excitation power interval was overlooked in the former approach due to the power dependence of average ACS values within this range. This study elucidates the reasons behind this power dependence and confirms the validity of ACS values at these excitation powers. We demonstrate that experimental conditions, specifically excitation pulse duration and power, can alter the distribution of decay parameters, leading to the power dependence of various average values, including decay lifetime and ACS. To illustrate this concept, we present a simple model with two contributing components, highlighting the major ideas. The key finding of this study is that both the low-power SD excitation and the moderate-power LD excitation form almost identical distributions of lifetime constants in an ensemble. These distributions exhibit a log-normal shape profile, unlike the Gaussian distributions observed with LD excitation at low excitation powers.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Optics Express
ISSN
1094-4087
e-ISSN
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Volume of the periodical
33
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
7434-7449
UT code for WoS article
001437127800003
EID of the result in the Scopus database
2-s2.0-85218495149