InGaN micro-LED-pillar as the building block for high brightness emitters

Shen, Chao; Ng, Tien Khee; Yang, Yang; Cha, Dongkyu; Ooi, Boon S.

doi:10.1109/ipcon.2013.6656491

Cited by 8 publications

(4 citation statements)

References 7 publications

(6 reference statements)

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“…51,52) Though the micro-pixel LEDs (µLEDs) have shown enhanced modulation characteristics compared to the conventional LEDs, their output powers are relatively low, making it less attractive for high brightness applications. 13,53) Therefore, the InGaN-based laser diode became a competitive light emitter for both indoor and outdoor VLC systems.…”

Section: Progress In Laser Based White Light Communicationsmentioning

confidence: 99%

“…Group-III nitride light-emitters, such as LEDs and LDs, have been demonstrated and studied for SSL and VLC applications. 53,55,73) However, the performance of LED-based SSL-VLC system is limited by "efficiency droop" and <100 MHz 3-dB bandwidth. InGaN-based LDs were recently studied for "efficiency-droop-free", high-speed light-emitter.…”

Section: Optical Light Sourcesmentioning

confidence: 99%

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Light based underwater wireless communications

Oubei

Shen

Kammoun

et al. 2018

Jpn. J. Appl. Phys.

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113

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Underwater wireless optical communication (UWOC) is a wireless communication technology that uses visible light to transmit data in underwater environment. Compared to radio-frequency (RF) and acoustic underwater techniques, UWOC has many advantages including large information bandwidth, unlicensed spectrum and low power requirements. This review paper provides an overview of the latest UWOC research. Additionally, we present a detailed description of transmitter and receiver technologies which are key components of UWOC systems. Moreover, studies investigating underwater optical channel models for both simple attenuation and the impact of turbulence including air bubbles and inhomogeneous salinity and temperature are also described. Future research challenges are identified and outlined.

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Section: Progress In Laser Based White Light Communicationsmentioning

confidence: 99%

Section: Optical Light Sourcesmentioning

confidence: 99%

Light based underwater wireless communications

Oubei

Shen

Kammoun

et al. 2018

Jpn. J. Appl. Phys.

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113

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“…Further investigations show that both GaN-based edge emitting laser diodes (EELDs) and vertical-cavity surface-emitting lasers (VCSELs) exhibit beyond GHz modulation bandwidth [21,22]. Though the micro-pixel LEDs have shown enhanced modulation characteristics compared to the broad-area counterparts, their output powers are relatively low, making it less attractive for high brightness applications [23,24]. Therefore, the GaN laser-based VLC will play an important part in free space optical communications.To date, the smart lighting and VLC functionalities have been demonstrated based on discrete devices, such as IIInitride LDs, transverse-transmission modulators, and planar photodetectors [25,26].…”

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confidence: 99%

Visible Lasers and Emerging Color Converters for Lighting and Visible Light Communications

Shen

2017

Light, Energy and the Environment

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GaN-based lasers are promising for white lighting and visible-light communication (VLC). The advances of III-nitride photonic integration, and the application of YAG crystal and perovskite-based phosphors to lighting and VLC will be discussed. OCIS codes: (060.2605) Free-space optical communication; (140.7300) Visible lasers; (230.3670) Light-emitting diodes; (230.5590) Quantum-well, -wire and -dot devices; (250.0250) Optoelectronics; (250.5960) Semiconductor lasers.The past decade witnessed the rapid development of III-nitride light-emitting diodes (LEDs) [1,2], superluminescent diodes (SLDs) [3,4], and laser diodes (LDs) [5,6], for solid-state lighting (SSL), visible-light communication (VLC), optical storage, and internet-of-things (IoT) [7,8]. InGaN/GaN quantum well (QW)-based LEDs have been established as the fundamental component for SSL applications while recent studies suggested that the GaN-based LDs, which is free from efficiency droop, may outperform LEDs as a viable high-power light source [9,10]. Meanwhile, there are increasing potentials in using such emitters in visible-light based optical communication systems for indoor and outdoor applications as data-rate demands are exponentially growing in the near future [8,11,12]. Since LDs exhibit significantly larger modulation bandwidth than LEDs, VLC links based on GaN lasers have shown multiple gigabit per second (Gbps) data rate, suggesting its growing potential for SSL-VLC dual-functionality applications [12,13]. The development of devices and components in laser-based white lighting and data communication systems will be discussed.Similar to the structure in white LEDs, laser white light bulb can be constructed by employing a blue laser exciting yellow phosphor as the color converter. A correlated color temperature (CCT) of ~ 4000 K and a color rendering index (CRI) of ~ 57 has been achieved using a 450-nm emitting LD and YAG:Ce phosphor [13,14]. The CRI and CCT can be further improved or engineered by using combinations of violet-blue LDs with a mixture of two or more color converters. For example, a CCT of ~ 2700 K and a CRI of > 90 has been reported using a violet LD exciting a mixture of red-, green-, and blue-emitting (RGB) phosphors [14]. By using a blue LD with novel CsPbBr3 perovskite nanocrystals (NCs) with conventional red phosphor as the color converter, a CRI of ~ 89 and a CCT of ~ 3200 K has been achieved [15]. Apart from the white light characteristics including CRI and CCT, the conversion efficiency and stability of color converters are of particular interest due to a significantly higher excitation power density in LD based white lighting [16]. Hence, the utilization of YAG:Ce single crystal phosphor plate has been investigated for high power laser based SSL lamp reaching a peak luminous flux of 1100 lm [17]. Ceramic YAG:Ce yellow phosphor plates have also been developed for efficient white light conversion under high power blue radiant flux density of 19.1 W/mm 2 [18]. The YAG crystal and perovskite-based phosphors offer new opportu...

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“…InGaN/GaN quantum well (QW) based optoelectronic devices are essential for light generation, transmission, modulation, and detection in the violet-blue-green color regime [1][2][3][4][5][6]. Recently, III-nitride laser diodes (LDs) have shown advantages as a viable high-power light source for a number of important applications, such as smart lighting, optical storage, free-space visible light communication, underwater wireless optical communication, and internet of things [1,[7][8][9].…”

mentioning

confidence: 99%