Moth-eye-structured light-emitting diodes

Rao, Jing; Winfield, Richard Dien; Keeney, Lynette

doi:10.1016/j.optcom.2010.01.056

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…13 Hierarchically-structured coatings have been used to study the mechanosensitivity of fibroblast cells, with relevance to applications in tissue engineering. 14 In optical applications, surface features have been employed to tune the surface optical band gap, 15 to increase the light extraction efficiency of diodes, 16 and to act as diffraction gratings. 17 Dome-like surface structures function as microlenses.…”

Section: Introductionmentioning

confidence: 99%

Bespoke periodic topography in hard polymer films by infrared radiation-assisted evaporative lithography

Georgiadis

Routh²,

Murray

et al. 2011

Soft Matter

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Section: Introductionmentioning

confidence: 99%

Bespoke periodic topography in hard polymer films by infrared radiation-assisted evaporative lithography

Georgiadis

Routh²,

Murray

et al. 2011

Soft Matter

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“…These structures form a gradual change in average refractive indices between air and the inside eye, and minimize surface Fresnel reflection over a broad range of wavelengths and incidence angles. − The gradual change in refractive indices is not only effective for suppressing surface Fresnel reflection but for total internal reflection. Some researchers have attempted to fabricate moth-eye structured LEDs and succeeded in increasing light extraction efficiency. − …”

Section: Introductionmentioning

confidence: 99%

Luminescent Antireflective Coatings with Disordered Surface Nanostructures Fabricated by Liquid Processes

Tanaka

Fujihara

2011

Langmuir

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Antireflective phosphor coatings having disordered surface nanostructures were fabricated by a sol-gel dip coating method and a subsequent hot water treatment. Thin films of a Bi(3+),Eu(3+)-codoped YVO4 red phosphor were first prepared and effects of the addition of an aluminum source to precursor solutions on their microstructure and optical properties were examined. Optical transmittance of the YVO4:Bi(3+),Eu(3+) film was lower than that of a bare quartz glass substrate due to a higher refractive index of YVO4. The addition of the aluminum source and the hot water treatment resulted in a considerable increase of transmittance and its smaller angular dependence, which could generate an antireflective effect by the phosphor thin films. Observation of the microstructure revealed that the hot water treatment brought a remarkable change in the surface as well as the cross-section structure in the aluminum-added YVO4:Bi(3+),Eu(3+) film. The film density and hence the refractive index were gradually changed like a pseudo moth-eye structure, which explained the occurrence of the antireflective effect. The microstructural change was attributed to the dissolution of alumina present in the film and the reprecipitation of boehmite on the film surface during the hot water treatment. Photoluminescence of the YVO4:Bi(3+),Eu(3+) film could also be enhanced by the antireflective effect due to the suppression of surface Fresnel reflection of incident light and total internal reflection of emitted light.

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“…These problems are critical, especially when the antireflective coatings are used textures; (c) optical properties of hierarchical 3D structure surfaces [5]. pol: Polarization for OLED, which are required to be flexible and stretchable in the future [43]. Inspired by the antireflective structure of moth eyes, structural antireflection through manufactured subwavelength structures was proposed by tuning the refractive index from step to gradual (shown in (iii) of Fig.…”

Section: Structures For Optical Manipulationmentioning

confidence: 99%

Laser interference fabrication of large-area functional periodic structure surface

Wang

et al. 2018

Front. Mech. Eng.

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Functional periodic structures have attracted significant interest due to their natural capabilities in regulating surface energy, surface effective refractive index, and diffraction. Several technologies are used for the fabrication of these functional structures. The laser interference technique in particular has received attention because of its simplicity, low cost, and high-efficiency fabrication of large-area, micro/nanometer-scale, and periodically patterned structures in air conditions. Here, we reviewed the work on laser interference fabrication of large-area functional periodic structures for antireflection, self-cleaning, and superhydrophobicity based on our past and current research. For the common cases, four-beam interference and multi-exposure of two-beam interference were emphasized for their setup, structure diversity, and various applications for antireflection, self-cleaning, and superhydrophobicity. The relations between multi-beam interference and multi-exposure of two-beam interference were compared theoretically and experimentally. Nanostructures as a template for growing nanocrystals were also shown to present future possible applications in surface chemical control. Perspectives on future directions and applications for laser interference were presented.

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Moth-eye-structured light-emitting diodes

Cited by 14 publications

References 14 publications

Bespoke periodic topography in hard polymer films by infrared radiation-assisted evaporative lithography

Bespoke periodic topography in hard polymer films by infrared radiation-assisted evaporative lithography

Luminescent Antireflective Coatings with Disordered Surface Nanostructures Fabricated by Liquid Processes

Laser interference fabrication of large-area functional periodic structure surface

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