Fully radiative relaxation of silicon nanocrystals in colloidal ensemble revealed by advanced treatment of decay kinetics

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F17%3A00477581" target="_blank" >RIV/61388963:_____/17:00477581 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/17:10370564

Result on the web

<a href="http://dx.doi.org/10.1063/1.4993584" target="_blank" >http://dx.doi.org/10.1063/1.4993584</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4993584" target="_blank" >10.1063/1.4993584</a>

Result language

angličtina

Original language name

Fully radiative relaxation of silicon nanocrystals in colloidal ensemble revealed by advanced treatment of decay kinetics

Original language description

A comprehensive study of the spectrally resolved photoluminescence (PL) decay kinetics of dodecyl-passivated colloidal silicon nanocrystals (Si NCs) is presented. The correct treatment of average decay lifetime is demonstrated. We report on importance to distinguish the external quantum efficiency (QE) from the internal QE. The external QE of the ensemble of Si NCs is measured to be similar to 60%, while the internal QE of Si NCs emitting around similar to 1.5 eV is evaluated to be near unity. This difference between internal and external QE is attributed to a fraction of ”dark” (absorbing but non-emitting) Si NCs in the ensemble. This conclusion is based on the analysis of deconvoluted size-selected decay curves retrieved by the presented mathematical procedure. The homogeneous line-broadening is estimated to be around 180 meV by experimentally challenging single-NC PL measurements. In addition, radiative lifetimes are calculated by the envelope function approximation and confirm the observed exponential increase of lifetime with decreasing emission photon energy.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10610 - Biophysics

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

Publication year

2017

Confidentiality

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

Name of the periodical

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

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Volume of the periodical

122

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

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UT code for WoS article

000406128800018

EID of the result in the Scopus database

2-s2.0-85024829337