Design of an LED chip structure with an integrated two-dimensional photonic crystal to enhance the light-extraction efficiency

Choi, Won-Sik; Park, Si-Hyun

doi:10.3938/jkps.64.1425

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…Choi et al used a structure that integrated the PC pattern in relief on the front side and intaglio on the negative side as a square arrangement to the top of the LED and found the best parameters to maximize the LEE through calculations and experimental studies. 74 Figure 13C shows a schematic of the PC-integrated LED structure. Figure 13D-F shows the maximum relative LEE of various PC patterns etched, including square and hexagonal columns, cylinders, and hexagonal pyramids, and the variation curves of LEE with PC relief and gravure cycles, which finally determined the PC structure parameters with maximum LEE.…”

Section: Surface (Top Bottom) 2d Photonic Crystal Ledsmentioning

confidence: 99%

“…Choi et al. used a structure that integrated the PC pattern in relief on the front side and intaglio on the negative side as a square arrangement to the top of the LED and found the best parameters to maximize the LEE through calculations and experimental studies 74 . Figure 13C shows a schematic of the PC‐integrated LED structure.…”

Section: Different Phc Structures To Improve the Optoelectronic Perfo...mentioning

confidence: 99%

“…(F) Relative extraction efficiency variation with frontal (blue dash) and negative (yellow dash) PC shapes. Reproduced from refs 73, 74. with permission of IOPscience and Springer.…”

Section: Different Phc Structures To Improve the Optoelectronic Perfo...mentioning

confidence: 99%

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Design of photonic crystals for light‐emitting diodes

Wang,

Dong,

et al. 2023

J Am Ceram Soc.

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Photonic crystals (PC) can greatly enhance the optoelectronic performance of LEDs, due to their distinctive color and photonic band gap, etc. Therefore, many scholars have conducted extensive research based on the high light extraction efficiency, good monochromaticity, and other excellent optoelectronic properties of PC LEDs. This review discusses the main principles of photonic crystals to improve the optoelectronic performance of LEDs and summarizes 12 structural applications of photonic crystal LEDs, such as PC slabs, Bragg grating, Backside reflectors, Surface PC, Embedded PC, Dual PC, PC beads, CPC, PC thin films, LIPC, defective PC, composite architectures with other materials that boost LED optoelectronic qualities. In summary, it is found that photonic crystals can not only greatly improve the light extraction efficiency of LEDs but also improve other optoelectronic properties such as luminescent color, and directional radiation angle, and reduce the manufacturing cost of LEDs. Photonic crystal LEDs are expected to be a strong candidate for future lighting technology Finally, the prospects and challenges of PC LEDs are summarized.This article is protected by copyright. All rights reserved

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Section: Surface (Top Bottom) 2d Photonic Crystal Ledsmentioning

confidence: 99%

Section: Different Phc Structures To Improve the Optoelectronic Perfo...mentioning

confidence: 99%

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Design of photonic crystals for light‐emitting diodes

Wang,

Dong,

et al. 2023

J Am Ceram Soc.

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“…To calculate the extraction power, first we simulate and calculate the extracted light power 0.1 μm from the top p-GaN surface at each time. Then, by integrating the extracted light power from 0 to the mean time required for a photon generated at the centre of the LED chip to reach to its boundary, we obtain the extraction power for the given LED structure [29]. Fig.…”

Section: Numerical Simulation Proceduresmentioning

confidence: 99%

Numerical simulations of light‐extraction efficiencies of light‐emitting diodes on micro and nanopatterned sapphire substrates

Cui

Park

2014

Micro & Nano Letters

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Numerical simulations are performed to investigate the light-extraction efficiencies (LEEs) of gallium nitride-based light-emitting diodes (LEDs) on patterned sapphire substrates (PSSs), using the three-dimensional finite-difference time-domain method. PSSs with hexagonal arrays of cone-shaped patterns were used, and the pitch of the pattern array, pattern fill factor and pattern height were varied from nanoscale to microscale. The relative LEE for each PSS-LED was calculated, and the geometrical parameters were analysed for optimised light extraction enhancement of the PSS-LEDs.

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“…Photons emitted beyond this angle will be internally confined due to the effect of total reflection. Many investigations have been made in this respect, such as texturing the emitting surface [2][3][4][5] , using a patterned substrate 6 , generating photonic crystals in LEDs [7][8][9][10] and some other special structures 11 . All these structures can realize the improvement of light extraction efficiency, but due to the diffraction effects, the scattered angle will have a certain increase 2 .…”

Section: Introductionmentioning

confidence: 99%

Both improvements of the light extraction efficiency and scattered angle of GaN-LED using sub-micron Fresnel lens array

Gu¹,

Chen²,

Shen³

et al. 2015

SPIE Proceedings

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With the demanding requirements for light source, light emitting diodes (LED) attracts more and more attention because of its inherent advantages such as low power consumption, high reliability and longevity. However, there are two disadvantages for LED, one is the low light extraction efficiency resulting from the total internal reflection, and the other is the relative large scattered angle. In order to improve the light extraction efficiency and collimate the out-coupling light, a sub-micron Fresnel lens array is introduced and investigated in this paper. The focal length of the proposed Fresnel lens is 3µm and the minimum width of the outmost ring is about 150nm. To calculate and analyze the light extraction efficiency and the scattered angle of LED with such Fresnel lens array structure, we optimize the parameters of the Fresnel lens, such as the depth of the Fresnel lens array structure and the thickness of the p-type gallium nitride layer by using the finite difference time domain method (FDTD). By comparing the discussed patterned GaN-based LED with that traditional flat LEDs, it can be found that significant enhancement factor of the light extraction efficiency, which is improved by 3.5 times, can be obtained and the scattered angle at half maximum can be decreased 50° from 60° with this novel Fresnel lens structure. It will be expected that the proposed sub-micron structure can find wide applications in LEDs industry.

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Design of an LED chip structure with an integrated two-dimensional photonic crystal to enhance the light-extraction efficiency

Cited by 6 publications

References 23 publications

Design of photonic crystals for light‐emitting diodes

Design of photonic crystals for light‐emitting diodes

Numerical simulations of light‐extraction efficiencies of light‐emitting diodes on micro and nanopatterned sapphire substrates

Both improvements of the light extraction efficiency and scattered angle of GaN-LED using sub-micron Fresnel lens array

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