High brightness AlGaInP light-emitting diodes

Streubel, K.; Linder, N.; Wirth, R.; Jaeger, A.

doi:10.1109/2944.999187

Cited by 179 publications

(87 citation statements)

References 48 publications

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“…A number of strategies have been employed to improve the extraction efficiency by using surface roughening, chip shaping, and nonresonant or resonant cavity effects. [1][2][3][4][5] In this letter, we introduce a way to improve light extraction by using arrays of micron sized LEDs ͑ -LEDs͒ with parabolic sidewalls to direct the emission through the transparent substrate. The active region contains self-assembled In͑Ga͒As quantum dots ͑QDs͒ on a GaAs substrate.…”

Section: Broadband Quantum Dot Micro-light-emitting Diodes With Parabmentioning

confidence: 99%

Broadband quantum dot micro-light-emitting diodes with parabolic sidewalls

Tanriseven¹,

Maaskant²,

Corbett³

2008

Applied Physics Letters

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Section: Broadband Quantum Dot Micro-light-emitting Diodes With Parabmentioning

confidence: 99%

Broadband quantum dot micro-light-emitting diodes with parabolic sidewalls

Tanriseven¹,

Maaskant²,

Corbett³

2008

Applied Physics Letters

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“…However, the TS approach suffers from the use of costly GaP substrates and a complicated wafer bonding process (Kish et al, 1995). Yet another way of improving AlGaInP device performance is the use of wafer-fused thin film LEDs with metal micro-reflectors for significantly increased light extraction (Streubel et al, 2002). The thin-film LEDs discussed by Streubel et al (2002) incorporate micro-reflectors that redirect waveguided modes towards the chip surface.…”

Section: Introductionmentioning

confidence: 99%

AlGaInP light-emitting diodes with omnidirectionally reflecting submount

et al. 2003

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Abstract:A novel AlGaInP light-emitting diode (LED) is presented that employs high-reflectivity omnidirectional reflector (ODR) submounts. It is shown that the reflective-submount (RS) LED has a higher light-extraction efficiency than conventional LEDs. Red AlGaInP RS-LEDs bonded to Sisubstrates are demonstrated using a silver-based ODR. The ODR is perforated by an array of small-area low-resistance ohmic contacts. The optical and electrical characteristics of the RSLEDs are presented and compared to conventional AlGaInP absorbing substrates (AS) LEDs with distributed Bragg reflectors (DBR). It is shown that the light output from the RS-LED exceeds that of AS-LEDs by about a factor of two.

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“…Light emitting diodes (LEDs) are gradually replacing conventional fluorescent lamps and incandescent lights due to their higher efficacy and longer lifespans [1]- [8]. LED drivers provide regulated or controlled currents to LEDs for constant lighting or dimming, regardless of source voltage changes and temperature variations.…”

Section: Introductionmentioning

confidence: 99%

LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation

Lee¹,

Sohn²,

Nguyen³

et al. 2015

Journal of Power Electronics

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A TRIAC dimming LED driver that can control the brightness of LED arrays for a wide range of source voltage variations is proposed in this paper. Unlike conventional PWM LED drivers, the proposed LED driver adopts a TRIAC switch, which inherently guarantees zero current switching and has been proven to be quite reliable over its long lifetime. Unlike previous TRIAC type LED drivers, the proposed LED driver is composed of an LC input filter and a variable switched capacitance, which is modulated by the TRIAC turn-on timing. Thus, the LED power regulation and dimming control, which are done by a volume resistor in the same way as the conventional TRIAC dimmers, can be simultaneously performed by the TRIAC control circuit. Because the proposed LED driver has high efficiency and a long lifetime with a high power factor (PF) and low total harmonic distortion (THD) characteristics, it is quite adequate for industrial lighting applications such as streets, factories, parking garages, and emergency stairs. A simple step-down capacitive power supply circuit composed of passive components only is also proposed, which is quite useful for providing DC power from an AC source without a bulky and heavy transformer. A prototype 60 W LED driver was implemented by the proposed design procedure and verified by simulation and experimental results, where the efficiency, PF, and THD are 92%, 0.94, and 6.3%, respectively. The LED power variation is well mitigated to below ± 2% for 190 V < V s < 250 V by using the proposed simple control circuit.

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High brightness AlGaInP light-emitting diodes

Cited by 179 publications

References 48 publications

Broadband quantum dot micro-light-emitting diodes with parabolic sidewalls

Broadband quantum dot micro-light-emitting diodes with parabolic sidewalls

AlGaInP light-emitting diodes with omnidirectionally reflecting submount

LED Driver with TRIAC Dimming Control by Variable Switched Capacitance for Power Regulation

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