Single Trap States in Single CdSe Nanoplatelets.
CdSe nanoplatelets
single-particle spectroscopy
spectral diffusion
transient absorption
trap states
Journal
ACS nano
ISSN: 1936-086X
Titre abrégé: ACS Nano
Pays: United States
ID NLM: 101313589
Informations de publication
Date de publication:
27 Apr 2021
27 Apr 2021
Historique:
pubmed:
25
3
2021
medline:
25
3
2021
entrez:
24
3
2021
Statut:
ppublish
Résumé
Trap states can strongly affect semiconductor nanocrystals, by quenching, delaying, and spectrally shifting the photoluminescence (PL). Trap states have proven elusive and difficult to study in detail at the ensemble level, let alone in the single-trap regime. CdSe nanoplatelets (NPLs) exhibit significant fractions of long-lived "delayed emission" and near-infrared "trap emission". We use these two spectroscopic handles to study trap states at the ensemble and the single-particle level. We find that reversible hole trapping leads to both delayed and trap PL, involving the same trap states. At the single-particle level, reversible trapping induces exponential delayed PL and trap PL, with lifetimes ranging from 40 to 1300 ns. In contrast with exciton PL, single-trap PL is broad and shows spectral diffusion and strictly single-photon emission. Our results highlight the large inhomogeneity of trap states, even at the single-particle level.
Identifiants
pubmed: 33759503
doi: 10.1021/acsnano.1c00481
pmc: PMC8155320
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
7216-7225Références
J Phys Chem Lett. 2012 Jun 21;3(12):1716-20
pubmed: 26285734
ACS Nano. 2012 Oct 23;6(10):8778-82
pubmed: 22992215
J Phys Chem Lett. 2020 May 7;11(9):3339-3344
pubmed: 32272839
J Phys Chem Lett. 2019 Jul 5;10(13):3637-3644
pubmed: 31187998
Phys Rev Lett. 2004 Sep 3;93(10):107403
pubmed: 15447451
Nano Lett. 2015 May 13;15(5):3056-66
pubmed: 25853555
Nano Lett. 2019 Nov 13;19(11):7770-7774
pubmed: 31596596
J Am Chem Soc. 2018 Nov 21;140(46):15712-15723
pubmed: 30375226
Chem Rev. 2010 Jan;110(1):389-458
pubmed: 19958036
Chem Mater. 2019 Oct 22;31(20):8484-8493
pubmed: 31666761
Nat Mater. 2016 Feb;15(2):141-53
pubmed: 26796733
Nature. 2011 Nov 09;479(7372):203-7
pubmed: 22071764
Chem Commun (Camb). 2016 Sep 29;52(80):11975-11978
pubmed: 27722289
J Am Chem Soc. 2018 Feb 7;140(5):1725-1736
pubmed: 29293359
Phys Chem Chem Phys. 2020 Nov 14;22(42):24686-24696
pubmed: 33103714
Nano Lett. 2017 Sep 13;17(9):5314-5320
pubmed: 28753318
J Phys Chem B. 2005 Apr 21;109(15):7012-21
pubmed: 16851797
J Am Chem Soc. 2018 Oct 17;140(41):13292-13300
pubmed: 30253644
Nat Mater. 2018 Jan;17(1):35-42
pubmed: 29035357
Small. 2011 Jul 18;7(14):2101-8
pubmed: 21710484
J Am Chem Soc. 2016 Apr 6;138(13):4310-3
pubmed: 26978480
J Phys Chem Lett. 2020 Jun 18;11(12):4755-4761
pubmed: 32459489
Science. 2019 Mar 15;363(6432):1199-1202
pubmed: 30872520
Science. 1997 Dec 19;278(5346):2114-7
pubmed: 9405345
J Phys Chem Lett. 2017 Oct 19;8(20):5209-5215
pubmed: 28972763
ACS Nano. 2017 Sep 26;11(9):9119-9127
pubmed: 28787569
Nat Chem. 2016 Nov;8(11):1061-1066
pubmed: 27768112
Phys Rev Lett. 2008 Jan 18;100(2):027403
pubmed: 18232922
J Am Chem Soc. 2015 Oct 14;137(40):12792-5
pubmed: 26414242
Proc Natl Acad Sci U S A. 2005 Oct 4;102(40):14284-9
pubmed: 16169907
J Phys Chem Lett. 2017 Sep 7;8(17):3997-4003
pubmed: 28763227
ACS Energy Lett. 2019 Jan 11;4(1):63-74
pubmed: 30662955
Nano Lett. 2016 Mar 9;16(3):2047-53
pubmed: 26863992
Nanoscale. 2018 Dec 13;10(48):22861-22870
pubmed: 30488930
ACS Nano. 2012 Aug 28;6(8):6751-8
pubmed: 22783952
Nat Mater. 2011 Oct 23;10(12):936-41
pubmed: 22019946
J Am Chem Soc. 2013 Dec 11;135(49):18536-48
pubmed: 24199846
J Phys Chem Lett. 2019 Jul 5;10(13):3732-3738
pubmed: 31204809
J Am Chem Soc. 2008 Dec 10;130(49):16504-5
pubmed: 19554725
Opt Express. 2013 Mar 25;21(6):7419-26
pubmed: 23546125
ACS Nano. 2015 Feb 24;9(2):1012-57
pubmed: 25608730
Nano Lett. 2015 Nov 11;15(11):7718-25
pubmed: 26496661