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Core/Shell CdSe/CdS bone‐shaped nanocrystals with a thick and anisotropic shell as optical emitters

Andrea Castelli, Balaji Dhanabalan, Anatolii Polovitsyn (UGent) , Vincenzo Caligiuri, Francesco Di Stasio, Alice Scarpellini, Rosaria Brescia, Milan Palei, Beatriz Martín‐García, Mirko Prato, et al.
(2020) ADVANCED OPTICAL MATERIALS. 8(1).
Author
Organization
Abstract
Colloidal core/shell nanocrystals are key materials for optoelectronics, enabling control over essential properties via precise engineering of the shape, thickness, and crystal structure of their shell. Here, the growth protocol for CdS branched nanocrystals is applied on CdSe nanoplatelet seeds and bone-shaped heterostructures are obtained with a highly anisotropic shell. Surprisingly, the nanoplatelets withstand the high growth temperature of 350 degrees C and structures with a CdSe nanoplatelet core that is overcoated by a shell of cubic CdS are obtained, on top of which tetrahedral CdS structures with hexagonal lattice are formed. These complex core/shell nanocrystals show a band-edge emission around 657 nm with a photoluminescence quantum yield of approximate to 42% in solution, which is also retained in thin films. Interestingly, the nanocrystals manifest simultaneous red and green emission and the relatively long wavelength of the green emission indicates charge recombination at the cubic/hexagonal interface of the CdS shell. The nanocrystal films show amplified spontaneous emission, random lasing, and distributed feedback lasing when the material is deposited on suitable gratings. This work stimulates the design and fabrication of more exotic core/shell heterostructures where charge carrier delocalization, dipole moment, and other optical and electrical properties can be engineered.
Keywords
amplified spontaneous emission, random lasing, branched heterostructures, core, shell nanocrystals, dual emission, seeded-growth synthesis, COLLOIDAL NANOCRYSTALS, SEMICONDUCTOR NANOCRYSTALS, AUGER RECOMBINATION, ROD NANOCRYSTALS, SEEDED GROWTH, QUANTUM DOTS, EMISSION, NANOPLATELETS, HETEROSTRUCTURES, CHALCOGENIDES

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MLA
Castelli, Andrea, et al. “Core/Shell CdSe/CdS Bone‐shaped Nanocrystals with a Thick and Anisotropic Shell as Optical Emitters.” ADVANCED OPTICAL MATERIALS, vol. 8, no. 1, 2020, doi:10.1002/adom.201901463.
APA
Castelli, A., Dhanabalan, B., Polovitsyn, A., Caligiuri, V., Di Stasio, F., Scarpellini, A., … Arciniegas, M. P. (2020). Core/Shell CdSe/CdS bone‐shaped nanocrystals with a thick and anisotropic shell as optical emitters. ADVANCED OPTICAL MATERIALS, 8(1). https://doi.org/10.1002/adom.201901463
Chicago author-date
Castelli, Andrea, Balaji Dhanabalan, Anatolii Polovitsyn, Vincenzo Caligiuri, Francesco Di Stasio, Alice Scarpellini, Rosaria Brescia, et al. 2020. “Core/Shell CdSe/CdS Bone‐shaped Nanocrystals with a Thick and Anisotropic Shell as Optical Emitters.” ADVANCED OPTICAL MATERIALS 8 (1). https://doi.org/10.1002/adom.201901463.
Chicago author-date (all authors)
Castelli, Andrea, Balaji Dhanabalan, Anatolii Polovitsyn, Vincenzo Caligiuri, Francesco Di Stasio, Alice Scarpellini, Rosaria Brescia, Milan Palei, Beatriz Martín‐García, Mirko Prato, Liberato Manna, Iwan Moreels, Roman Krahne, and Milena P. Arciniegas. 2020. “Core/Shell CdSe/CdS Bone‐shaped Nanocrystals with a Thick and Anisotropic Shell as Optical Emitters.” ADVANCED OPTICAL MATERIALS 8 (1). doi:10.1002/adom.201901463.
Vancouver
1.
Castelli A, Dhanabalan B, Polovitsyn A, Caligiuri V, Di Stasio F, Scarpellini A, et al. Core/Shell CdSe/CdS bone‐shaped nanocrystals with a thick and anisotropic shell as optical emitters. ADVANCED OPTICAL MATERIALS. 2020;8(1).
IEEE
[1]
A. Castelli et al., “Core/Shell CdSe/CdS bone‐shaped nanocrystals with a thick and anisotropic shell as optical emitters,” ADVANCED OPTICAL MATERIALS, vol. 8, no. 1, 2020.
@article{8699729,
  abstract     = {{Colloidal core/shell nanocrystals are key materials for optoelectronics, enabling control over essential properties via precise engineering of the shape, thickness, and crystal structure of their shell. Here, the growth protocol for CdS branched nanocrystals is applied on CdSe nanoplatelet seeds and bone-shaped heterostructures are obtained with a highly anisotropic shell. Surprisingly, the nanoplatelets withstand the high growth temperature of 350 degrees C and structures with a CdSe nanoplatelet core that is overcoated by a shell of cubic CdS are obtained, on top of which tetrahedral CdS structures with hexagonal lattice are formed. These complex core/shell nanocrystals show a band-edge emission around 657 nm with a photoluminescence quantum yield of approximate to 42% in solution, which is also retained in thin films. Interestingly, the nanocrystals manifest simultaneous red and green emission and the relatively long wavelength of the green emission indicates charge recombination at the cubic/hexagonal interface of the CdS shell. The nanocrystal films show amplified spontaneous emission, random lasing, and distributed feedback lasing when the material is deposited on suitable gratings. This work stimulates the design and fabrication of more exotic core/shell heterostructures where charge carrier delocalization, dipole moment, and other optical and electrical properties can be engineered.}},
  articleno    = {{1901463}},
  author       = {{Castelli, Andrea and Dhanabalan, Balaji and Polovitsyn, Anatolii and Caligiuri, Vincenzo and Di Stasio, Francesco and Scarpellini, Alice and Brescia, Rosaria and Palei, Milan and Martín‐García, Beatriz and Prato, Mirko and Manna, Liberato and Moreels, Iwan and Krahne, Roman and Arciniegas, Milena P.}},
  issn         = {{2195-1071}},
  journal      = {{ADVANCED OPTICAL MATERIALS}},
  keywords     = {{amplified spontaneous emission,random lasing,branched heterostructures,core,shell nanocrystals,dual emission,seeded-growth synthesis,COLLOIDAL NANOCRYSTALS,SEMICONDUCTOR NANOCRYSTALS,AUGER RECOMBINATION,ROD NANOCRYSTALS,SEEDED GROWTH,QUANTUM DOTS,EMISSION,NANOPLATELETS,HETEROSTRUCTURES,CHALCOGENIDES}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{9}},
  title        = {{Core/Shell CdSe/CdS bone‐shaped nanocrystals with a thick and anisotropic shell as optical emitters}},
  url          = {{http://doi.org/10.1002/adom.201901463}},
  volume       = {{8}},
  year         = {{2020}},
}
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