Red light emitting solid state hybrid quantum dot–near-UV GaN LED devices

Song, Hong-Joo; Lee, Seonghoon

doi:10.1088/0957-4484/18/25/255202

Cited by 65 publications

(48 citation statements)

References 13 publications

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“…© 2008 American Institute of Physics. ͓DOI: 10.1063/1.2973163͔ Quantum dots ͑QDs͒ have attracted much attention due to their potential applications for many high performance devices, 1 viz., the Si-solar cell 2 and QD based light emitting diodes. 3 Chemically synthesized 4,5 QDs with precise size ͑Ͻ5 nm͒ control and a suitable organic/inorganic cap are currently available for many practical applications.…”

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confidence: 99%

Controlled surface distribution and luminescence of YVO4:Eu3+ nanophosphor layers

Khan

Haranath

Yadav

et al. 2008

Applied Physics Letters

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A method of dispersing YVO 4 : Eu quantum dots ͑QDs͒ as uniform two-dimensional ͑2D͒ layers with a high degree of homogeneity is presented. Annealing at 773 K resulted in coalescence of QDs to form nanoclusters with size of ϳ25 nm with an improved photoluminescence and ϳ80% transmittance at 800 nm. An efficient 5 D 0 -7 F 2 transition and lifetimes of ϳ1038 s for the characteristic Eu 3+ emission were observed. The absorption and emission peaks showed a slight blueshift, due to quantum-size effect, as compared to that for the bulk counterpart. Our method of 2D layer deposition is useful to enhance spectral response of the solar cells. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2973163͔ Quantum dots ͑QDs͒ have attracted much attention due to their potential applications for many high performance devices, 1 viz., the Si-solar cell 2 and QD based light emitting diodes.3 Chemically synthesized 4,5 QDs with precise size ͑Ͻ5 nm͒ control and a suitable organic/inorganic cap are currently available for many practical applications. 6 The QDs of phosphor materials could be even more interesting as they do not scatter light and show enhanced emission efficiencies 7 and radiative lifetime shortening. 8 The spatially distributed phosphor QDs can act as a thin layer having good optical transparency and high emission characteristics. Such a layer can be useful for increasing the power conversion efficiency of a solar cell. The objective of the present study is to fabricate highly transparent and luminescent two-dimensional ͑2D͒ layer using inorganic capped YVO 4 QDs that possess the advantages of quantum-size effect. Annealing treatments performed to the layers not only initiated the nanocluster formation but also provided a proper thermal encapsulation, adherence, and increased PL emission related efficiencies.In utilizing nanoparticles for device technology one of the fundamental issues is how to distribute nanoparticles uniformly over a substrate with a precise control of particle density. In most of the studies, the self-assembly scheme has been employed using the chemical interaction between the nanoparticles and the substrate.9-11 This method is effective in achieving a dense layer of nanoparticles. However, the control of the particle density is difficult at submonolayer regime. Moreover, special chemical treatments of the substrate surface are needed and the results are sensitive to local chemical environment with enhanced defect susceptibility.In this letter, we demonstrate the fabrication of uniformly distributed sodium hexametaphosphate ͑SHMP͒ capped YVO 4 : Eu nanophosphor layer with controlled particle density using the conventional spin-coating method followed by annealing treatment.It is well known that the OH − groups show significant luminescence quenching behavior for most of the inorganic QDs.12 Commonly, researchers synthesize YVO 4 : Eu nanophosphor by wet-chemical methods and protect the surface atoms by phosphate capping followed by redispersion in deionized water. This results in fully hydrat...

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confidence: 99%

Controlled surface distribution and luminescence of YVO4:Eu3+ nanophosphor layers

Khan

Haranath

Yadav

et al. 2008

Applied Physics Letters

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“…10.3.3 may alleviate many of these problems. In fact, CdSe-ZnSe quantum dots or nanoparticles have been demonstrated as potential substitute for "red phosphor" for use in near UV pumping [68]. However, due to their direct nature, luminescence of a given nanoparticle size is sharply dependent on its size, which requires the use of an appropriate size distribution to produce broadened emission.…”

Section: Solid State Led White Lightingmentioning

confidence: 99%

Optics in Nanotechnology

Nayfeh

2016

Optics in Our Time

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“…An example is shown in Figure 6. Physical mixing is often used with organic soluble polymers, such as PMMA [29,31], cellulose [23,32] and so on. In order to maintain or even increase the PL QY, additional protective shells e.g., out of CdS [32], ZnS [20] and/or silica [33] are utilized for covering the core NCs.…”

Section: Integration Of As Synthesized Semiconductor Ncs Into Polymermentioning

confidence: 99%