Natural white light

Horiuchi, Noriaki

doi:10.1038/nphoton.2010.244

Cited by 41 publications

(14 citation statements)

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“…The high efficiency of light-emitting diodes (LEDs) already provides very substantial energy savings in a number of lighting applications. [1][2][3] Moreover, LEDs fundamentally offer new functionalities such as the control of color temperature, dimming level, pulsation, far-field emission pattern, and even polarization, all of which is far less controllable for traditional lighting sources. 4 Such optically functional light sources (i.e., LEDs) can provide many benefits in general lighting, automobiles, and display applications.…”

mentioning

confidence: 99%

Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers

Meyaard

Shan

et al. 2012

Appl. Phys. Lett.

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We demonstrate a back-emitting (sapphire-substrate emitting) linearly polarized GaInN lightemitting diode (LED) embedded with a subwavelength-sized aluminum wire-grid polarizer (WGP). Rigorous coupled wave analysis is implemented to study the polarization characteristics of such a WGP LED. The aluminum nanowire grating with a period of 150 nm is located on the sapphire backside of a GaInN LED structure and is fabricated by electron-beam lithography and inductively coupled plasma reactive-ion etching. A polarization ratio of 0.96 is demonstrated for a WGP GaInN LED in good agreement with simulation results. V C 2012 American Institute of Physics.The high efficiency of light-emitting diodes (LEDs) already provides very substantial energy savings in a number of lighting applications. 1-3 Moreover, LEDs fundamentally offer new functionalities such as the control of color temperature, dimming level, pulsation, far-field emission pattern, and even polarization, all of which is far less controllable for traditional lighting sources. 4 Such optically functional light sources (i.e., LEDs) can provide many benefits in general lighting, automobiles, and display applications. 5,6 However, the control of one property-optical polarization-still remains insufficient, despite the fact that LEDs with polarized emission would be extremely useful particularly for liquid-crystal display (LCD) backlighting and projectiondisplay lighting, as well as for sensing and communication applications. For example, in a LCD, only polarized emission can be switched on and off. Currently backlighting sources emit unpolarized light and absorptive polarizers are separated from the LED backlighting unit, which results in a loss of light. 7 Therefore, if a LED can generate polarized emission with high efficiency, it will undoubtedly be beneficial to the energy efficiency of LCDs. 8 Previously it has been reported that the light emitted from GaInN LEDs epitaxially grown on different crystal planes of sapphire substrates shows some degree of polarization. 9-11 However, the polarization ratios (PRs) were not high enough for practical applications. In the present study, we investigate polarized emission from a GaInN LED in which a subwavelength aluminum wire-grid polarizer is embedded.A wire-grid polarizer (WGP) relies on a conductive metal grating and its interaction with the incident light, particularly its electric field component. Embedding a metallic WGP on top of a LED (which will be denoted as a "WGP LED") offers several advantages: First, an extremely high PR is possible with a WGP structure. Second, a WPG

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confidence: 99%

Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers

Meyaard

Shan

et al. 2012

Appl. Phys. Lett.

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“…An increasing energy consumption accompanied with a deficiency in fossil fuels has led to a consensus throughout the globe that, harnessing of energy efficiency conception in daily life is vital in ensuring a sustainable tomorrow [1][2]. Prior approach has been devoted to solid-state lighting, owing to a huge fraction of electricity generated today, which is opted for lighting purposes [3][4][5].…”

Section: Accepted Manuscript Intrmentioning

confidence: 99%

Alteration of structural and optical properties in quaternary Al0.1In0.1Ga0.8N films using ultraviolet assisted photo-electrochemical etching route

Lim

Quah

Hassan

et al. 2015

Journal of Alloys and Compounds

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“…[1][2][3] However, these devices suffer from a rapid efficiency droop with increasing injection current, 4,5 which of the exact origin is still under debate. 6 In order to circumvent this problem, numerous methods and novel designs have been proposed and demonstrated to be effective in droop improvement.…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement of blue InGaN/GaN light-emitting diodes with an AlGaN-GaN-AlGaN electron blocking layer

Xia¹,

Li²,

Lü

et al. 2012

Journal of Applied Physics

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Blue InGaN/GaN multiple quantum well light-emitting diodes (LEDs) with the conventional AlGaN and AlGaN-GaN-AlGaN (AGA) electron blocking layer (EBL) are investigated numerically. The simulation results show that the LEDs with the AGA EBL exhibit much higher output power and smaller efficiency droop at high current as compared to those with the conventional EBL due to the enhancement of the electron confinement and improvement of the hole injection from p-type region, which are induced by the strong electrostatic fields and tunneling effect in the AGA EBL.

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Natural white light

Cited by 41 publications

References 1 publication

Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers

Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers

Alteration of structural and optical properties in quaternary Al0.1In0.1Ga0.8N films using ultraviolet assisted photo-electrochemical etching route

Efficiency enhancement of blue InGaN/GaN light-emitting diodes with an AlGaN-GaN-AlGaN electron blocking layer

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