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Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs

[Image: see text] It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low quantum yield due to the separation of the electron and hole wavefunctions. Recently, high quantum yield levels were reported for cadmium-based type-II QDs. Hence, the quest for finding non-...

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Autores principales: Eren, Guncem Ozgun, Sadeghi, Sadra, Bahmani Jalali, Houman, Ritter, Maximilian, Han, Mertcan, Baylam, Isinsu, Melikov, Rustamzhon, Onal, Asim, Oz, Fatma, Sahin, Mehmet, Ow-Yang, Cleva W., Sennaroglu, Alphan, Lechner, Rainer T., Nizamoglu, Sedat
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8283760/
https://www.ncbi.nlm.nih.gov/pubmed/34196177
http://dx.doi.org/10.1021/acsami.1c08118
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author Eren, Guncem Ozgun
Sadeghi, Sadra
Bahmani Jalali, Houman
Ritter, Maximilian
Han, Mertcan
Baylam, Isinsu
Melikov, Rustamzhon
Onal, Asim
Oz, Fatma
Sahin, Mehmet
Ow-Yang, Cleva W.
Sennaroglu, Alphan
Lechner, Rainer T.
Nizamoglu, Sedat
author_facet Eren, Guncem Ozgun
Sadeghi, Sadra
Bahmani Jalali, Houman
Ritter, Maximilian
Han, Mertcan
Baylam, Isinsu
Melikov, Rustamzhon
Onal, Asim
Oz, Fatma
Sahin, Mehmet
Ow-Yang, Cleva W.
Sennaroglu, Alphan
Lechner, Rainer T.
Nizamoglu, Sedat
author_sort Eren, Guncem Ozgun
collection PubMed
description [Image: see text] It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low quantum yield due to the separation of the electron and hole wavefunctions. Recently, high quantum yield levels were reported for cadmium-based type-II QDs. Hence, the quest for finding non-toxic and efficient type-II QDs is continuing. Herein, we demonstrate environmentally benign type-II InP/ZnO/ZnS core/shell/shell QDs that reach a high quantum yield of ∼91%. For this, ZnO layer was grown on core InP QDs by thermal decomposition, which was followed by a ZnS layer via successive ionic layer adsorption. The small-angle X-ray scattering shows that spherical InP core and InP/ZnO core/shell QDs turn into elliptical particles with the growth of the ZnS shell. To conserve the quantum efficiency of QDs in device architectures, InP/ZnO/ZnS QDs were integrated in the liquid state on blue light-emitting diodes (LEDs) as down-converters that led to an external quantum efficiency of 9.4% and a power conversion efficiency of 6.8%, respectively, which is the most efficient QD-LED using type-II QDs. This study pointed out that cadmium-free type-II QDs can reach high efficiency levels, which can stimulate novel forms of devices and nanomaterials for bioimaging, display, and lighting.
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spelling pubmed-82837602021-07-16 Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs Eren, Guncem Ozgun Sadeghi, Sadra Bahmani Jalali, Houman Ritter, Maximilian Han, Mertcan Baylam, Isinsu Melikov, Rustamzhon Onal, Asim Oz, Fatma Sahin, Mehmet Ow-Yang, Cleva W. Sennaroglu, Alphan Lechner, Rainer T. Nizamoglu, Sedat ACS Appl Mater Interfaces [Image: see text] It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low quantum yield due to the separation of the electron and hole wavefunctions. Recently, high quantum yield levels were reported for cadmium-based type-II QDs. Hence, the quest for finding non-toxic and efficient type-II QDs is continuing. Herein, we demonstrate environmentally benign type-II InP/ZnO/ZnS core/shell/shell QDs that reach a high quantum yield of ∼91%. For this, ZnO layer was grown on core InP QDs by thermal decomposition, which was followed by a ZnS layer via successive ionic layer adsorption. The small-angle X-ray scattering shows that spherical InP core and InP/ZnO core/shell QDs turn into elliptical particles with the growth of the ZnS shell. To conserve the quantum efficiency of QDs in device architectures, InP/ZnO/ZnS QDs were integrated in the liquid state on blue light-emitting diodes (LEDs) as down-converters that led to an external quantum efficiency of 9.4% and a power conversion efficiency of 6.8%, respectively, which is the most efficient QD-LED using type-II QDs. This study pointed out that cadmium-free type-II QDs can reach high efficiency levels, which can stimulate novel forms of devices and nanomaterials for bioimaging, display, and lighting. American Chemical Society 2021-07-01 2021-07-14 /pmc/articles/PMC8283760/ /pubmed/34196177 http://dx.doi.org/10.1021/acsami.1c08118 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Eren, Guncem Ozgun
Sadeghi, Sadra
Bahmani Jalali, Houman
Ritter, Maximilian
Han, Mertcan
Baylam, Isinsu
Melikov, Rustamzhon
Onal, Asim
Oz, Fatma
Sahin, Mehmet
Ow-Yang, Cleva W.
Sennaroglu, Alphan
Lechner, Rainer T.
Nizamoglu, Sedat
Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title_full Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title_fullStr Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title_full_unstemmed Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title_short Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
title_sort cadmium-free and efficient type-ii inp/zno/zns quantum dots and their application for leds
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8283760/
https://www.ncbi.nlm.nih.gov/pubmed/34196177
http://dx.doi.org/10.1021/acsami.1c08118
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