Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10502260

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Optics Express

ISSN

1094-4087

e-ISSN

—

Svazek periodika

33

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

7434-7449

Kód UT WoS článku

001437127800003

EID výsledku v databázi Scopus

2-s2.0-85218495149