Chemical synthesis and optical, structural, and surface characterization of InP-In2O3 quantum dots

Granada-Ramírez, D.A.; Arias-Cerón, J.S.; Pérez-González, M.; Luna-Arias, Juan Pedro; Cruz‐Orea, A.; Rodríguez-Fragoso, P.; Herrera-Pérez, J. L.; Gómez-Herrera, M.L.; Tomás, S.A.; Vázquez-Hernández, F.; Duran-Ledezma, Angel A.; Mendoza-Álvarez, J. G.

doi:10.1016/j.apsusc.2020.147294

Cited by 24 publications

(5 citation statements)

References 44 publications

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“…The high intensity peak recorded at 126–131 eV can be attributed to the P 3– for InP, while another weaker peak in the range of 130–135 eV is related to the P 3+ to 5+ for InPO x . After introducing Ga 3+ , the representative peak of P 2p in InP shifted from 128.5 to 129.2 eV, which is attributed to the slightly higher electronegativity of Ga than In. Meanwhile, due to the presence of both P-Ga and P-In combinations, the P 2p peak in InP of the InP/GaP spectrum is widened significantly.…”

Section: Resultsmentioning

confidence: 98%

Blue-Emitting InP/GaP/ZnS Quantum Dots with Enhanced Stability by Siloxane Capping: Implication for Electroluminescent Devices

Shen

Zhu

et al. 2022

ACS Appl. Nano Mater.

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InP quantum dots (QDs) with low toxicity are an ideal alternative to Cd-based QDs. However, the optical properties and stability of blue-emitting InP QDs are far inferior to those of red and green QDs. In this work, we report the synthesis of highly fluorescent InP/GaP/ZnS core/shell/shell QDs with an emission wavelength of 484 nm and photoluminescence quantum yield of 71%, along with a full width at half-maximum as narrow as 45 nm. In addition, we encapsulated the QDs with siloxane via specific ligand exchange and condensation reactions to improve their stability. The corresponding siloxane capping QD light-emitting device (QLED) shows a maximum luminance of 690 Cd m–2, an external quantum efficiency of 0.09%, and a much longer lifetime than pristine QDs. As a result, these enable the siloxane capping QDs to achieve a much stronger storage stability and a longer QLED lifetime than pristine QDs.

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Section: Resultsmentioning

confidence: 98%

Blue-Emitting InP/GaP/ZnS Quantum Dots with Enhanced Stability by Siloxane Capping: Implication for Electroluminescent Devices

Shen

Zhu

et al. 2022

ACS Appl. Nano Mater.

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“…For the InP core QDs, the In 3d spectrum exhibits two peaks located at 444.5 eV (3d 5/2 ) and 452.1 eV (3d 3/2 ) (Figure g,h), which can be assigned to InP. − The P 2p spectrum shows two doublets, which are related to the two different chemical environments of the phosphorus atoms. The first pre-dominant doublet that occurs at 127.8–128.9 eV (2p 3/2 ) is the characteristic peak for InP. , The doublet in the 132.4–133.4 eV range is associated with the P atoms in an oxidized medium, most probably InPO X . , In the XPS spectra of InP/ZnO core/shell QDs, the peaks corresponding to Zn 2p are observed which indicates the Zn 2+ bound to oxygen in the ZnO. − The Zn 2p 3/2 and 2p 1/2 peaks are at 1022.09 and 1045.8 eV, respectively (Figure S3c). For the InP/ZnO core/shell QDs, the In 3d peak shifts to higher binding energies located at 444.7 eV (3d 5/2 ) and 452.5 eV (3d 3/2 ), compared to the InP core QD (Figure S3a).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The first pre-dominant doublet that occurs at 127.8−128.9 eV (2p 3/2 ) is the characteristic peak for InP. 48,49 The doublet in the 132.4− 133.4 eV range is associated with the P atoms in an oxidized medium, most probably InPO X . 45,50 In the XPS spectra of InP/ ZnO core/shell QDs, the peaks corresponding to Zn 2p are observed which indicates the Zn 2+ bound to oxygen in the ZnO.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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

Eren

Sadeghi

Jalali

et al. 2021

ACS Appl. Mater. Interfaces

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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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“…In plants in a portion of 0.2% and in animals up to 1% of its mass is phosphorus. Since the P 2p doublet is placed between 131 and 136 eV, with the P 2p 3/2 and P 2p 1/2 signals places at 132.8 and 133.7 eV, respectively, indicating that phosphorus oxides have been formed [23]. Potassium is a white-silvery alkali metal, which is abundant in nature in the elements related to saltwater and other minerals [14].…”

Section: Resultsmentioning

confidence: 99%

Application of XPS and PA techniques in the study of lime used in the Talavera House from the historical center of Mexico City

Pérez¹,

Cruz²,

Pérez³

et al. 2021

Superficies y Vacio

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X-ray Photoelectron Spectroscopy (XPS) and Photoacoustic (PA) techniques are useful to identify the structure and optical properties of chemical compounds used in archaeology, among others. In the present study XPS and PA techniques were used to analyze seven samples obtained from the Talavera House, during the conservation and restoration works carried out in the 2012-2013 period. Talavera House is located between the República del Salvador, Talavera and Roldán streets, in the historic center of Mexico City. The objective of this study was to identify the chemical compounds added to the lime when burned in the furnace and its use in the tanneries during the 18th century, both elements located in the second yard, as well as in the construction of the corridor in the 20th century located in the first courtyard. The samples were collected at these points and analyzed by XPS and Photoacoustic (PA) techniques, comparing these results with other excavated sites.

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Chemical synthesis and optical, structural, and surface characterization of InP-In2O3 quantum dots

Abstract: Graphical abstract

Cited by 24 publications

References 44 publications

Blue-Emitting InP/GaP/ZnS Quantum Dots with Enhanced Stability by Siloxane Capping: Implication for Electroluminescent Devices

Blue-Emitting InP/GaP/ZnS Quantum Dots with Enhanced Stability by Siloxane Capping: Implication for Electroluminescent Devices

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

Application of XPS and PA techniques in the study of lime used in the Talavera House from the historical center of Mexico City

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