Light extraction efficiency improvement by multiple laser stealth dicing in InGaN-based blue light-emitting diodes

Zhang, Yiyun; Xie, Hongtao; Zheng, Hui; Wei, Tongbo; Yang, Hua; Li, Jing; Yi, Xiaoyan; Song, Xiangyang; Wang, Guohong; Li, Jinmin

doi:10.1364/oe.20.006808

Cited by 40 publications

(35 citation statements)

References 15 publications

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“…The nano-roughened surface allows the photons emitted from the active regions to escape from the LEDs, accordingly, increases the LEE of LED devices. This mechanism for the improvement of light output power in our experiment agrees well with the previously reported [9,11,12]. It is necessary to point out that light output power of sample D is a little lower than sample C. We suspect that the lower output power of sample D is caused by the degradation of crystalline quality in p-GaN layer, which has been showed by XRD FWHMs above.…”

Section: Resultssupporting

confidence: 92%

“…This problem seriously hindered the realization of high external quantum efficiency (EQE) of LEDs. Some methods toward improving the LEE of LED devices have been proposed, mainly including photonic crystal (PC) [2,3], localized surface plasmons (LSPs) [4][5][6], patterned substrate [7] and surface roughening [8][9][10][11][12]. Specifically, surface roughening is widely accepted on account of its simple and efficient characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, surface roughening is widely accepted on account of its simple and efficient characteristics. Nowadays, etching process is often used to obtain a rough surface [8][9][10]. However, the etching processes not only increase costs, but also easily change the surface state of p-GaN layer and thereby degrade the electrical properties of devices.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of light extraction efficiency in InGaN/GaN-based light-emitting diodes with a nano-roughened p-GaN surface

Xiang-Jing

Zhang

et al. 2014

J Mater Sci: Mater Electron

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The following paper presents a study on the performance of InGaN/GaN-based light-emitting diodes (LEDs) with a nano-roughened p-GaN surface, which were grown by metal-organic chemical vapor deposition. This nano-roughened p-GaN surface was obtained by using nitrogen (N 2 ) as cyclopentadienyl magnesium (Cp 2 Mg) carrier gas during the growth of p-GaN layer. Research results show that the surface roughness of p-GaN layer is influenced by the injection flow of N 2 and the injection time of N 2 . Under the optimal process condition, the light output power of LED with a nano-roughened p-GaN surface is improved by 30.4 % compared with that of conventional LED with an injection current of 20 mA. Meanwhile, current-voltage curve shows that the electrical performance of this sample is similar to that of conventional LED. The improvement of light output power is mainly attributed to the higher light extraction efficiency when nano-roughened p-GaN surface is adopted.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of light extraction efficiency in InGaN/GaN-based light-emitting diodes with a nano-roughened p-GaN surface

Xiang-Jing

Zhang

et al. 2014

J Mater Sci: Mater Electron

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“…Fireflies produce their own light, which needs to be extracted from photocytes found in its bioluminescent organ (called "lantern"). It has been shown in previous works [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] that the firefly Photuris sp. presents a two-dimensional pattern with an asymmetrical triangular profile with sizes in the range of a few micrometers on its lantern cuticle.…”

Section: Introductionmentioning

confidence: 99%

Optimal overlayer inspired by Photuris firefly improves light-extraction efficiency of existing light-emitting diodes

Bay¹,

André²,

Sarrazin³

et al. 2013

Opt. Express

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In this paper the design, fabrication and characterization of a bioinspired overlayer deposited on a GaN LED is described. The purpose of this overlayer is to improve light extraction into air from the diode's high refractive-index active material. The layer design is inspired by the microstructure found in the firefly Photuris sp. The actual dimensions and material composition have been optimized to take into account the high refractive index of the GaN diode stack. This two-dimensional pattern contrasts other designs by its unusual profile, its larger dimensions and the fact that it can be tailored to an existing diode design rather than requiring a complete redesign of the diode geometry. The gain of light extraction reaches values up to 55% with respect to the reference unprocessed LED.

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“…[352,353] Bay et al have recently shown that the structure of the cuticle outside of the light-emitting organ increases the efficiency of the light emission by ≈10%. [352] The light-extraction efficiency of synthetic electroluminescent devices, e.g., organic light-emitting diodes (OLEDs), suffers from the same refractive-index-mismatch, [354] and the insight from the firefly lantern structure has been used to improve light-extraction from OLEDs by up to 55%. [353] …”

Section: Bioluminescencementioning

confidence: 99%

It's Not a Bug, It's a Feature: Functional Materials in Insects

2018

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Over the course of their wildly successful proliferation across the earth, the insects as a taxon have evolved enviable adaptations to their diverse habitats, which include adhesives, locomotor systems, hydrophobic surfaces, and sensors and actuators that transduce mechanical, acoustic, optical, thermal, and chemical signals. Insect‐inspired designs currently appear in a range of contexts, including antireflective coatings, optical displays, and computing algorithms. However, as over one million distinct and highly specialized species of insects have colonized nearly all habitable regions on the planet, they still provide a largely untapped pool of unique problem‐solving strategies. With the intent of providing materials scientists and engineers with a muse for the next generation of bioinspired materials, here, a selection of some of the most spectacular adaptations that insects have evolved is assembled and organized by function. The insects presented display dazzling optical properties as a result of natural photonic crystals, precise hierarchical patterns that span length scales from nanometers to millimeters, and formidable defense mechanisms that deploy an arsenal of chemical weaponry. Successful mimicry of these adaptations may facilitate technological solutions to as wide a range of problems as they solve in the insects that originated them.

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Light extraction efficiency improvement by multiple laser stealth dicing in InGaN-based blue light-emitting diodes

Cited by 40 publications

References 15 publications

Improvement of light extraction efficiency in InGaN/GaN-based light-emitting diodes with a nano-roughened p-GaN surface

Improvement of light extraction efficiency in InGaN/GaN-based light-emitting diodes with a nano-roughened p-GaN surface

Optimal overlayer inspired by Photuris firefly improves light-extraction efficiency of existing light-emitting diodes

It's Not a Bug, It's a Feature: Functional Materials in Insects

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