TY - JOUR

T1 - Resonant plasmon enhancement of light emission from CdSe/CdS nanoplatelets on Au nanodisk arrays

AU - Milekhin, I. A.

AU - Anikin, K. V.

AU - Rahaman, M.

AU - Rodyakina, E. E.

AU - Duda, T. A.

AU - Saidzhonov, B. M.

AU - Vasiliev, R. B.

AU - Dzhagan, V. M.

AU - Milekhin, A. G.

AU - Batsanov, S. A.

AU - Gutakovskii, A. K.

AU - Latyshev, A. V.

AU - Zahn, D. R.T.

N1 - Funding Information: The authors gratefully acknowledge financial support from the Volkswagen Foundation, MERGE project (TU Chemnitz), State assignment (Grant No. 0242-2019-0001), DFG project (Grant No. ZA 146/43-1), DFG project (Grant No. ZA 146/44-1), RFBR (Project Nos. 19-52-12041_NNIO_a and 18-02-00615_a), and the Ministry of Education and Science of the Russian Federation [Grant No. 075-15-2020-797 (13.1902.21.0024)]. HRTEM studies were performed using the equipment of CKP “Nanostructures.” The authors are thankful to Mr. A. S. Medvedev for Au deposition. Publisher Copyright: © 2020 Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10/28

Y1 - 2020/10/28

N2 - Semiconducting nanoplatelets (NPLs) have attracted great attention due to the superior photophysical properties compared to their quantum dot analogs. Understanding and tuning the optical and electronic properties of NPLs in a plasmonic environment is a new paradigm in the field of optoelectronics. Here, we report on the resonant plasmon enhancement of light emission including Raman scattering and photoluminescence from colloidal CdSe/CdS nanoplatelets deposited on arrays of Au nanodisks fabricated by electron beam lithography. The localized surface plasmon resonance (LSPR) of the Au nanodisk arrays can be tuned by varying the diameter of the disks. In the case of surface-enhanced Raman scattering (SERS), the Raman intensity profile follows a symmetric Gaussian shape matching the LSPR of the Au nanodisk arrays. The surface-enhanced photoluminescence (SEPL) profile of NPLs, however, follows an asymmetric Gaussian distribution highlighting a compromise between the excitation and emission enhancement mechanisms originating from energy transfer and Purcell effects. The SERS and SEPL enhancement factors depend on the nanodisk size and reach maximal values at 75 and 7, respectively, for the sizes, for which the LSPR energy of Au nanodisks coincides with interband transition energies in the semiconductor platelets. Finally, to explain the origin of the resonant enhancement behavior of SERS and SEPL, we apply a numerical simulation to calculate plasmon energies in Au nanodisk arrays and emission spectra from NPLs in such a plasmonic environment.

AB - Semiconducting nanoplatelets (NPLs) have attracted great attention due to the superior photophysical properties compared to their quantum dot analogs. Understanding and tuning the optical and electronic properties of NPLs in a plasmonic environment is a new paradigm in the field of optoelectronics. Here, we report on the resonant plasmon enhancement of light emission including Raman scattering and photoluminescence from colloidal CdSe/CdS nanoplatelets deposited on arrays of Au nanodisks fabricated by electron beam lithography. The localized surface plasmon resonance (LSPR) of the Au nanodisk arrays can be tuned by varying the diameter of the disks. In the case of surface-enhanced Raman scattering (SERS), the Raman intensity profile follows a symmetric Gaussian shape matching the LSPR of the Au nanodisk arrays. The surface-enhanced photoluminescence (SEPL) profile of NPLs, however, follows an asymmetric Gaussian distribution highlighting a compromise between the excitation and emission enhancement mechanisms originating from energy transfer and Purcell effects. The SERS and SEPL enhancement factors depend on the nanodisk size and reach maximal values at 75 and 7, respectively, for the sizes, for which the LSPR energy of Au nanodisks coincides with interband transition energies in the semiconductor platelets. Finally, to explain the origin of the resonant enhancement behavior of SERS and SEPL, we apply a numerical simulation to calculate plasmon energies in Au nanodisk arrays and emission spectra from NPLs in such a plasmonic environment.

KW - QUANTUM DOTS

KW - RAMAN-SCATTERING

KW - OPTICAL-PROPERTIES

KW - SEEDED GROWTH

KW - SHAPE CONTROL

KW - NANOCRYSTALS

KW - NANOPARTICLES

KW - FLUORESCENCE

KW - SE

KW - HETEROSTRUCTURES

UR - http://www.scopus.com/inward/record.url?scp=85094902803&partnerID=8YFLogxK

U2 - 10.1063/5.0025572

DO - 10.1063/5.0025572

M3 - Article

C2 - 33138402

AN - SCOPUS:85094902803

VL - 153

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 16

M1 - 164708

ER -