Midgap radiative centers in carbon-enriched hexagonal boron nitride.
defects
hexagonal boron nitride
midgap centers
single-photon emitters
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
16 06 2020
16 06 2020
Historique:
pubmed:
3
6
2020
medline:
3
6
2020
entrez:
3
6
2020
Statut:
ppublish
Résumé
When serving as a protection tissue and/or inducing a periodic lateral modulation for/in atomically thin crystals, hexagonal boron nitride (hBN) has revolutionized the research on van der Waals heterostructures. By itself, hBN appears as an emergent wide-bandgap material, which, importantly, can be optically bright in the far-ultraviolet range and which frequently displays midgap defect-related centers of yet-unclear origin, but, interestingly, acting as single-photon emitters. Controlling the hBN doping is of particular interest in view of the possible practical use of this material. Here, we demonstrate that enriching hBN with carbon (C) activates an optical response of this material in the form of a series of well-defined resonances in visible and near-infrared regions, which appear in the luminescence spectra measured under below-bandgap excitation. Two, qualitatively different, C-related radiative centers are identified: One follows the Franck-Condon principle that describes transitions between two defect states with emission/annihilation of optical phonons, and the other shows atomic-like resonances characteristic of intradefect transitions. With a detailed characterization of the energy structure and emission dynamics of these radiative centers, we contribute to the development of controlled doping of hBN with midgap centers.
Identifiants
pubmed: 32482864
pii: 2003895117
doi: 10.1073/pnas.2003895117
pmc: PMC7306815
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
13214-13219Informations de copyright
Copyright © 2020 the Author(s). Published by PNAS.
Déclaration de conflit d'intérêts
The authors declare no competing interest.
Références
Annu Rev Phys Chem. 2019 Jun 14;70:123-142
pubmed: 30735459
Nano Lett. 2015 Nov 11;15(11):7329-33
pubmed: 26509431
Nanoscale. 2017 Sep 21;9(36):13575-13582
pubmed: 28876012
Nat Nanotechnol. 2016 Jan;11(1):37-41
pubmed: 26501751
Phys Rev B Condens Matter. 1996 Jul 1;54(2):1117-1122
pubmed: 9985381
Opt Lett. 2000 Sep 1;25(17):1294-6
pubmed: 18066197
Phys Rev B Condens Matter. 1991 Jan 1;43(1):879-893
pubmed: 9996283
Nat Mater. 2004 Jun;3(6):404-9
pubmed: 15156198
Annu Rev Phys Chem. 2014;65:83-105
pubmed: 24274702
Nat Mater. 2020 May;19(5):540-545
pubmed: 32094496
Nat Mater. 2021 Aug;20(8):1079-1084
pubmed: 33958771
Science. 2007 Aug 17;317(5840):932-4
pubmed: 17702939