Vertically Aligned ZnO and ZnS Quantum Dot Based Hybrid White LED

Tiwari, Neha; Mehto, Varsha R.; Nishad, K. K.; Singh, Rakesh; Pandey, R. K.

doi:10.1166/jno.2015.1691

Cited by 4 publications

(1 citation statement)

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“…Since they display unique physical, chemical, and optical properties, these materials have often been used in various advanced devices, such as non-linear optics [ 3 ] and photovoltaic devices [ 4 ] and, more recently, in some advanced biomedical areas for diagnostic or therapeutic studies [ 5 , 6 ]. Among the most well-known examples, first-row divalent transition metal ion-doped ZnS nanocrystallites, such as ZnS:Mn [ 7 ] and ZnS:Cu [ 8 ], have gained special interest due to their high luminescent efficiency and thermal stability, which are essential properties required for commercial electro-luminescence devices [ 9 ]. There have been many published articles regarding preparation methods of such materials.…”

Section: Introductionmentioning

confidence: 99%

Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution

Heo

Hwang

2016

Nanomaterials

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Water-dispersible ZnS:Mn nanocrystals (NCs) were synthesized by capping the surface with polar L-aspartic acid (Asp) molecules. The obtained ZnS:Mn-Asp NC product was optically and physically characterized using the corresponding spectroscopic methods. The ultra violet-visible (UV-VIS) absorption spectrum and photoluminescence (PL) emission spectrum of the NCs showed broad peaks at 320 and 590 nm, respectively. The average particle size measured from the obtained high resolution-transmission electron microscopy (HR-TEM) image was 5.25 nm, which was also in accordance with the Debye-Scherrer calculations using the X-ray diffraction (XRD) data. Moreover, the surface charge and degree of aggregation of the ZnS:Mn-Asp NCs were determined by electrophoretic and hydrodynamic light scattering methods, respectively. These results indicated the formation of agglomerates in water with an average size of 19.8 nm, and a negative surface charge (−4.58 mV) in water at ambient temperature. The negatively-charged NCs were applied as a photosensor for the detection of specific cations in aqueous solution. Accordingly, the ZnS:Mn-Asp NCs showed an exclusive luminescence quenching upon addition of copper (II) cations. The kinetic mechanism study on the luminescence quenching of the NCs by the addition of the Cu2+ ions proposed an energy transfer through the ionic binding between the two oppositely-charged ZnS:Mn-Asp NCs and Cu2+ ions.

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Section: Introductionmentioning

confidence: 99%

Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution

Heo

Hwang

2016

Nanomaterials

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Colloidal quantum dots for optoelectronics

et al. 2017

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Optically tunable magnetoelectric properties of inorganic-organic multiferroic flexible film

Chakraborty

Mandal

Saha

2019

Journal of Applied Physics

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Magnetoelectric composites are promising materials for their physical properties such as spontaneous electrical polarization or magnetization with the application of magnetic or electric field. In addition, Spinel ferrite based magnetoelectric composite materials absorb a range of light energy, which offers a lot of physical phenomena behind the light-dependent magnetoelectric properties of the composite. The piezoelectric organic polymer based magnetoelectric composite of Zn0.2Co0.8Fe2O4-poly(vinylidene fluoride) flexible film has been fabricated by a chemical pyrophoric reaction process followed by a solution casting process. Structural and surface morphologies of the composite film have been studied. The visible light and applied magnetic field dependent AC electrical properties of the composite flexible film have been investigated at room temperature which reveals that the maximum change in impedance is found to be ∼10% and ∼20%, respectively. However, with an influence of both the light and the magnetic field, the impedance of the composite film is largely changed attributing that the excited electron may get a low resistive path through the grain and grain boundaries where the maximum change in impedance is found to be ∼30%. This result further is confirmed from the change of grain and grain boundary resistance and capacitance through the fitting of Nyquist plots. The present work provides information about the optically and magnetically influenced physical properties of the composite flexible film, which will be expanded for multiferroic magnetoelectric device applications.

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Vertically Aligned ZnO and ZnS Quantum Dot Based Hybrid White LED

Cited by 4 publications

References 0 publications

Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution

Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution

Colloidal quantum dots for optoelectronics

Optically tunable magnetoelectric properties of inorganic-organic multiferroic flexible film

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