Combining surface plasmonic and light extraction enhancement on InGaN quantum-well light-emitters

Fadil, Ahmed; Ou, Yiyu; Iida, Daisuke; Kamiyama, Satoshi; Petersen, Paul Michael; Ou, Haiyan

doi:10.1039/c6nr04375e

Cited by 18 publications

(17 citation statements)

References 29 publications

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“…With advances in manufacturing processes, including the use of a low-dimensional light-emitting medium with high spontaneous emission rate [1], a plasmonic nanostructure for light extraction improvement [2] and a novel wafer-scale packaging technique [3], solid-state lighting based upon GaN-based light-emitting diodes (LEDs) has emerged as the dominant technology for indoor/outdoor illumination, horticulture/car lighting, and advertising displays. For these visible LEDs, InGaN/GaN multiple quantum wells (MQWs) grown on sapphire substrates are generally used as the active layer for light emission.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Dual Functional InGaN LED Arrays as the Optical Transmitter and Receiver for Optical Wireless Communications

Tsai

Wang²,

Lu³

et al. 2021

IEEE Photonics J.

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The feasibility of using InGaN/GaN multiple-quantum-well light-emitting diode arrays (LED arrays) as photodiodes (PDs) is investigated experimentally in addition to their light emitting function. Two discrete LED arrays are produced from one 4 × 4 LED array with a parallel-connected pixel configuration. Such compact designs are useful for light emission or detection at the transmitting/receiving terminals of optical wireless communication systems. Despite 4 × 2 LED arrays achieving a light output power of 67.4 mW at 250 mA, they exhibit an optical responsivity (detectivity) of 0.183 A/W (1.61 × 1012 cm Hz 1/2 W −1 ) under ultraviolet light illumination (λ = 380 nm) at zero bias. For 4 × 2 LED arrays, the presence of an appreciable ultraviolet light response, together with a high 3-dB bandwidth (~8 MHz) for modulated light detection, allowed us to build a 15 Mbit/s directed optical link with these LEDs functioning as both the optical transmitter and the receiver. Finally, the unitary LED array-based optical link is capable of real-time transmission of digital audio signals (data rate = 6 Mbit/s) at a propagation distance of 100 cm in free space even though some of the constituent pixels are inactive for light detection.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Dual Functional InGaN LED Arrays as the Optical Transmitter and Receiver for Optical Wireless Communications

Tsai

Wang²,

Lu³

et al. 2021

IEEE Photonics J.

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“…By virtue of their unique material properties, nanostructures of III-nitride materials have been of considerable interest for various applications including piezotronic sensing, ambient energy harvesting, nanostructurebased lighting and computing devices, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13] Numerous types of nitride nanostructures have been explored via either templateassisted or template-free fabrication methodologies. [14][15][16][17] In the template-assisted strategy, material growth is carried out on sacrificial nanostructured template materials such as carbon nanotubes, polymers, or anodic aluminum oxide (AAO).…”

Section: Introductionmentioning

confidence: 99%

Long-range ordered vertical III-nitride nano-cylinder arrays via plasma-assisted atomic layer deposition

et al. 2018

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“…However, room for improvements remains, including the internal quantum efficiency of the active region [5,6], the light-extraction technology [7], the current-flow design [8,9], the minimization of resistive loss [10], the electrostatic discharge stability [11], and the color-rendering property via the color mixing [12,13]. Aside these improvements, it is known that, due to their importance, various stress-measured degradation tests, including thermal, electrical, static charges, and moisture, have been developed [14,15].…”

Section: Introductionmentioning

confidence: 99%

Multi-Azimuth Failure Mechanisms in Phosphor-Coated White LEDs by Current Aging Stresses

Peng¹,

Guo²,

Wu³

et al. 2018

Preprint

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Abstract:We have experimentally analyzed multi-azimuth degradation mechanisms that govern failures of commercially-available high-power (1 Watt) phosphor-coated white (hppc-W) light-emitting diodes (LEDs) covered with peanut-shaped lenses under three current-stress aging (CSA) conditions. Comprehensive analyses focus on photometric, chromatic, electrical, thermal, and packaging characteristics. At the packaging level, (a) the decrease of the phosphor-conversion efficiency, (b) the yellow-browning of the optical lens, and (c) the darkening of the silver-coated reflective layer deposited with extraneous chemical elements (e.g., C, O, Si, Mg, and Cu, respectively) contribute collectively to the integral degradation of the optical power. By contrast, Ohmic contacts, thermal properties, and angles of maximum intensity remain unchanged after 3840 h aging in three cases. Particularly at the chip level, the formation of point defects increases the number of non-radiative recombination centers, and thus decreases the optical power during aging stages. Nevertheless, in view of the change of the ideality factor, the dopant activation and the annealing effect facilitate the increase of the optical power in two specific aging stages (192 h∼384 h and 768 h∼1536 h), respectively. This work offers a systematic guidance for the development of reliable LED-based light sources in general-lighting areas.

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Combining surface plasmonic and light extraction enhancement on InGaN quantum-well light-emitters

Cited by 18 publications

References 29 publications

Fabrication and Characterization of Dual Functional InGaN LED Arrays as the Optical Transmitter and Receiver for Optical Wireless Communications

Fabrication and Characterization of Dual Functional InGaN LED Arrays as the Optical Transmitter and Receiver for Optical Wireless Communications

Long-range ordered vertical III-nitride nano-cylinder arrays via plasma-assisted atomic layer deposition

Multi-Azimuth Failure Mechanisms in Phosphor-Coated White LEDs by Current Aging Stresses

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