Increased Light Extraction From Vertical GaN Light-Emitting Diodes With Ordered, Cone-Shaped Deep-Pillar Nanostructures

An, Hongyu; Sim, Jae In; Shin, Ki Seob; Sung, Yun Mo; Kim, Tae Geun

doi:10.1109/jqe.2012.2190587

Cited by 25 publications

(12 citation statements)

References 33 publications

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“…The cone-shaped pillar patterns were made by spin-coating polystyrene nanospheres onto n-GaN substrates and subsequently etching the surface under oxygen plasma. They reported that their structure increased the output power of VLEDs by up to 214% at 350 mA versus a reference device, and they attributed this to the multiple light scattering from the sidewalls of the cones (Figure 17) [139]. (Figure 17) [139].…”

Section: Light Emitting Diodesmentioning

confidence: 99%

Bottom-Up Assembly and Applications of Photonic Materials

Zheng

Ravaine

2016

Crystals

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Abstract:The assembly of colloidal building-blocks is an efficient, inexpensive and flexible approach for the fabrication of a wide variety of photonic materials with designed shapes and large areas. In this review, the various assembly routes to the fabrication of colloidal crystals and their post-assembly modifications to the production of photonic materials are first described. Then, the emerging applications of the colloidal photonic structures in various fields such as biological and chemical sensing, anti-reflection, photovoltaics, and light extraction are summarized.

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Section: Light Emitting Diodesmentioning

confidence: 99%

Bottom-Up Assembly and Applications of Photonic Materials

Zheng

Ravaine

2016

Crystals

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“…To increase the LEE of LEDs, several approaches had focused on fabricating micro-/nanostructures either inside or outside the LEDs [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, roughed GaN surface [3][4][5][6][7], roughed sapphire substrate [8,9], roughed indium tin oxide (ITO) surface [10][11][12], and grown ZnO micro-/nanostructures [13][14][15] have been implemented in LEDs. The common nanoscale patterning techniques, such as electron-beam lithography [16], nanoimprint lithography [17], holographic lithography [18], hydrothermally method [19], and nanosphere lithography (NSL) [20], are used to obtain nanoscale surface textures.…”

Section: Introductionmentioning

confidence: 99%

Performance of GaN-Based LEDs with Nanopatterned Indium Tin Oxide Electrode

Chen

Liu

Wan

et al. 2016

Journal of Nanomaterials

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The indium tin oxide (ITO) has been widely applied in light emitting diodes (LEDs) as the transparent current spreading layer. In this work, the performance of GaN-based blue light LEDs with nanopatterned ITO electrode is investigated. Periodic nanopillar ITO arrays are fabricated by inductive coupled plasma etching with the mask of polystyrene nanosphere. The light extraction efficiency (LEE) of LEDs can be improved by nanopatterned ITO ohmic contacts. The light output intensity of the fabricated LEDs with nanopatterned ITO electrode is 17% higher than that of the conventional LEDs at an injection current of 100 mA. Three-dimensional finite difference time domain simulation matches well with the experimental result. This method may serve as a practical approach to improving the LEE of the LEDs.

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“…Most of photons were trapped inside the GaNbased LED device and converted to heat, which degrades the performance and the durability of the device. Roughening the top surface of the LEDs is an effective and simple method to improve the light extraction, such as conelike surface, [6][7][8] honeycomb structure, 9 microlens arrays, [10][11][12] etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of large-scale spherical-cap structure and the application on n-GaN based light-emitting diodes

Yin

Zhu

Shen

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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An under exposure method based on Fresnel diffraction effect in a conventional optical lithography system is used to fabricate large-scale, uniform spherical-cap structures. This method provides an effective roughening technology on the top surface of light-emitting diodes (LEDs) to improve the light extraction efficiency of LEDs. LEDs with high duty cycle spherical-cap structures showed enhanced light output power by 130%-160% compared with the LED with a flat surface. This simple and easy shape control method has potential applications in other optical devices such as organic LEDs, inorganic solar cells, and laser diodes. V

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Increased Light Extraction From Vertical GaN Light-Emitting Diodes With Ordered, Cone-Shaped Deep-Pillar Nanostructures

Cited by 25 publications

References 33 publications

Bottom-Up Assembly and Applications of Photonic Materials

Bottom-Up Assembly and Applications of Photonic Materials

Performance of GaN-Based LEDs with Nanopatterned Indium Tin Oxide Electrode

Fabrication of large-scale spherical-cap structure and the application on n-GaN based light-emitting diodes

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