Enhancing light extraction of GaN-based blue light-emitting diodes by a tuned nanopillar array

Chen, Zhanxu; Ren, Yuan; Xiao, Guoqing; Li, Juntao; Xia, Chen; Chen, Jin; Zhang, Baijun

doi:10.1088/1674-1056/23/1/018502

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…Firstly, an ordered monolayer of polystyrene (PS) spheres with 450 nm in diameter was formed on the undoped GaN layer. [23,24] Secondly, in order to prepare the arrays of larger nanoparticles or nanohole arrays, the sizes of nanospheres were tailored by reactive-ion etching (RIE) with oxygen plasma, prior to deposition of the silver. The nanospheres could be etched to a smaller diameter, while maintaining the position of the sphere in the crystalline lattice.…”

Section: Experimental Methodsmentioning

confidence: 99%

Enhanced light emission from InGaN/GaN quantum wells by using surface plasmonic resonances of silver nanoparticle array

et al. 2014

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Section: Experimental Methodsmentioning

confidence: 99%

Enhanced light emission from InGaN/GaN quantum wells by using surface plasmonic resonances of silver nanoparticle array

et al. 2014

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“…Tsai et al [18] have fabricated embedded PhCs within the GaN/InGaN green LEDs to enhance the LEE of LEDs by 78%, and meanwhile, the view angle of LEDs has also been collimated from 131.5 • to 114.0 • . Chen et al [19] have used nano-pillar array to improve the LEE of GaN-based blue LEDs and achieved a factor of 1.41 enhancement at 20 mA current injection. However, these methods were all aiming at a single wavelength extraction which had little effect on the LEE enhancement of other wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

Li¹,

Li²,

Kong³

et al. 2017

PIER C

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Abstract-In this work, we present a three-component hierarchical structure to simultaneously improve the red, green, and blue (RGB) light extraction efficiency (LEE) of white light-emitting diodes (LEDs) based on color mixing method. With the help of 3D finite-difference time-domain (FDTD) simulations, the effects of the embedded photonic crystals (PhCs) the normal surface PhCs and the nano-rods on the enhancement of RGB light extraction were investigated. The results were compared with those of the conventional planar LEDs and the normal surface PhCs LEDs over the whole visible spectrum. Results from the simulations demonstrated that the maximum LEE for the hierarchical structures LEDs gave 112%, 327%, and 284% RGB LEE enhancement, respectively, compared to that of the conventional planar LEDs, and achieved 104%, 191%, and 187% RGB LEE enhancement compared to that of LEDs with normal surface PhCs. The emission characteristics of the hierarchical structures LEDs were also revealed in detail by FDTD simulations. The results shown in this paper would do a favor for the design and fabrication of high efficiency LEDs.

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“…Comparing to the silica nanosphere, the size of polystyrene (PS) nanosphere will be decreased with increasing the etching time as an etching mask. Through the PS NSL method, nanopillars with different diameters can be obtained and the LEE of LEDs can be optimized [23]. In addition, the nanopillar structure will take the characteristic of small top and big bottom, and this is helpful for the light to escape due to the gradient refractive index.…”

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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Enhancing light extraction of GaN-based blue light-emitting diodes by a tuned nanopillar array

Cited by 9 publications

References 29 publications

Enhanced light emission from InGaN/GaN quantum wells by using surface plasmonic resonances of silver nanoparticle array

Enhanced light emission from InGaN/GaN quantum wells by using surface plasmonic resonances of silver nanoparticle array

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

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

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