Fabrication of high-brightness GaN-based light-emitting diodes via thermal nanoimprinting of ZnO-nanoparticle-dispersed resin

Byeon, Kyeong Jae; Cho, Joong Yeon; Jo, Han Byeol; Lee, Heon

doi:10.1016/j.apsusc.2015.03.022

Cited by 23 publications

(10 citation statements)

References 39 publications

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“…ZnAl 2 O 4 with a spinel crystalline structure and wide bind gap of 3.8 eV has drawn much attention [8] since it can be used as catalyst, catalyst support, and in optical coating with reasonable properties including withstanding high temperature, high mechanical resistance, better diffusion and ductility, and low surface acidity [9,10]. ZnO with a hexagonal wurtzite structure has a wide band gap (3.37 eV), making it appropriate for application such as a luminescent material in LED [11], phosphor material in CRT screens [12], in solar cells because of the high optical transmittance [13], and so on. In addition, ZnO has an excellent photocatalytic capacity to decompose organic pollutants to CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

In situ crystallization of ZnAl2O4/ZnO nanocomposite on alumina granule for photocatalytic purification of wastewater

et al. 2016

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ZnAl 2 O 4 /ZnO nanocomposites with different ZnO (20,30, and 40 mol%) concentrations and coated samples on supports were successfully prepared through combustion synthesis assisted by microwave. Two catalyst supports (a-Al 2 O 3 granules and c-Al 2 O 3 granules) in the forming of granules were used by sintering. The obtained products after calcination were characterized by X-ray diffraction (XRD), electron microscopy (SEM and TEM), Brunauer-Emmett-Teller (BET), dynamic light scattering (DLS), photoluminescence spectroscopy (PL), and UV-Vis spectroscopy. Samples were studied by degradation of methyl orange (MO) under UV irradiation in a photoreactor to evaluate the photocatalytic performance. Degradation using a ZnAl 2 O 4 /ZnO (30 mol%) nanocomposite reached 97.1 %. cAl 2 O 3 granules have demonstrated considerable difference in photocatalytic efficiency compared to a-Al 2 O 3 granules. Therefore, the coated granules were able to & Mozhgan Shahmirzaee be employed for the removal of dyes from wastewater, having desirable repeatability and reusability. Our results may initiate large-scale production of coated layers with promising photocatalytic performances.

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Section: Introductionmentioning

confidence: 99%

In situ crystallization of ZnAl2O4/ZnO nanocomposite on alumina granule for photocatalytic purification of wastewater

et al. 2016

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“…This hypothesis is in agreement with the scattered light measured from a thin layer of TiO 2 NPs on silicon at these wavelengths (see supplementary material). For embossed LEDs, the obtained values for the OPE are significantly higher than those reported with other approaches involving add-on layers made at room temperature 18 and comparable to or higher than the values obtained with approaches which require recrystallization 2,15 or even GaN patterning. 6,8,[24][25][26] Further enhancement is also expected after encapsulation, compared to the OPE value reported in Ref.…”

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confidence: 41%

“…Patterning the surface of the gallium nitride (GaN) layers on light emitting devices like matrices of micro-LEDs hybridized on CMOS substrates 11,12 or on thinner InGaN/ GaN LEDs is, however, more difficult to implement on a wafer-scale (unless, in the latter case, advanced lattice matched substrates are used). 13 More recently, add-on patterned layers have been introduced [14][15][16][17][18][19] and may help to circumvent this issue. The developed approaches use SiNbased or sol-gel-based photonic crystals, microprisms made from sputtered TiO 2 , arrays of microstructures made from polymers with or without high-index TiO 2 nanoparticles (NPs) in it, or grown ZnO wires.…”

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confidence: 99%

“…Although surface patterns composed of metal-oxide nanoparticles have recently been investigated for light extraction, the OPE was limited to 1.2. 18 In this study, arrays of microcones made of TiO 2 nanoparticle (NP) assemblies are investigated for light extraction management in GaN-based LEDs. The microcone arrays are embossed using a TiO 2 NP solution dispersed on the target surface and by subsequently pressing a pre-formed mold.…”

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confidence: 99%

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Strong light extraction enhancement using TiO2 nanoparticles-based microcone arrays embossed on III-Nitride light emitting diodes

Désières

Chen

Visser

et al. 2018

Applied Physics Letters

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DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

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“…The demand for the miniaturized oxygen partial pressure sensor is becoming increasingly high due to the low signal-to-noise ratio, low power consumption, reduced weight, and low cost, especially for integrated applications [1,33,34]. The patterning of ZnO NPs have been attempted by various techniques such as inkjet printing [35], imprinting [36], laser ablation [37], and photolithography [37,38]. However, the patterning of ZnO NPs is still challenged by the mechanical stability, chemical resistivity, and cost, etc.…”

Section: Sensing With the Patterned Zno Np Linesmentioning

confidence: 99%

Sensing of Oxygen Partial Pressure in Air with ZnO Nanoparticles

Chang

Chu

2020

Sensors

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The demand for sensors in response to oxygen partial pressure in air is increasingly high in recent years and small-size sensors on a micrometer scale and even a nanometer scale are particularly desirable. In this paper, the sensing of oxygen partial pressure in air was realized by a solution-processed ZnO nanoparticle (NP). Thin-film ZnO NP was prepared by spin-coating and a highly sensitive sensor was then fabricated. The oxygen sensing performance was characterized in air and compared with that in nitrogen, which showed an increase in electrical conductance by more than 100 times as a result of decreasing oxygen partial pressure from 103 mBar to 10−5 mBar. Moreover, higher sensitivity was achieved by increasing the annealing temperature and the effect of thermal annealing was also investigated. Furthermore, ZnO NP lines with 7 μm in width were successfully patterned with low cost by a mould-guided drying technique from ZnO NP dispersion, which makes ZnO NP extremely promising for miniaturized and integrated sensing applications.

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Fabrication of high-brightness GaN-based light-emitting diodes via thermal nanoimprinting of ZnO-nanoparticle-dispersed resin

Cited by 23 publications

References 39 publications

In situ crystallization of ZnAl2O4/ZnO nanocomposite on alumina granule for photocatalytic purification of wastewater

In situ crystallization of ZnAl2O4/ZnO nanocomposite on alumina granule for photocatalytic purification of wastewater

Strong light extraction enhancement using TiO2 nanoparticles-based microcone arrays embossed on III-Nitride light emitting diodes

Sensing of Oxygen Partial Pressure in Air with ZnO Nanoparticles

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