scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

A novel white light LED structure using omnidirectional one-dimensional photonic crystals

15 Dec 2003-Vol. 1, pp 171-171
TL;DR: In this article, a white light LED structure containing a one-dimensional photonic crystal was designed by realistic fabrication parameters for the formation of omnidirectional photonic band gaps.
Abstract: We theoretically demonstrate a white light LED structure containing a one-dimensional photonic crystal which is designed by realistic fabrication parameters for the formation of omnidirectional photonic band gaps. With a band gap around 370 nm, such a novel structure could completely trap the desired UV light inside the LED array and let the visible light pass through.
Citations
More filters
Patent
17 Jul 2006
TL;DR: In this paper, the wall material of the photonic material has dielectric properties and acts as such in an essentially non-absorbing manner for the wavelength of an absorption band of the respective colorant.
Abstract: The invention relates to photonic materials with regularly arranged cavities, containing at least one colorant. The wall material of the photonic material has dielectric properties and acts as such in an essentially non-absorbing manner for the wavelength of an absorption band of the respective colorant and is essentially transparent to the wavelength of an emission of the colorant, which can be excited by the absorption wavelength, and the cavities are formed in such a manner that radiation of the wavelength of the weak absorption band of the colorant is stored in the photonic material. The invention also relates to the use of these photonic materials as luminous substance system in an illuminant, to corresponding illuminants and to production methods.

26 citations

Patent
17 Jul 2006
TL;DR: In this article, angeordneten Kavitaten, enthaltend mindestens ein Farbmittel, wobei das Wandmaterial des photonischen Materials dielektrische Eigenschaften aufweist and als solches im wesentlichen nicht absorbierend fur die Wellenlange einer Absorptionsbande des jeweiligen Farbittels wirkt.
Abstract: Die Erfindung betrifft photonische Materialien mit regelmasig angeordneten Kavitaten, enthaltend mindestens ein Farbmittel, wobei das Wandmaterial des photonischen Materials dielektrische Eigenschaften aufweist und als solches im wesentlichen nicht absorbierend fur die Wellenlange einer Absorptionsbande des jeweiligen Farbmittels wirkt und im wesentlichen transparent ist fur die Wellenlange einer durch die Absorptionswellenlange anregbaren Emission des Farbmittels und die Kavitaten so gestaltet sind, dass Strahlung der Wellenlange der schwachen Absorptionsbande des Farbmittels in dem photonischen Material gespeichert wird, deren Verwendung als Leuchtstoffsystem in einem Beleuchtungsmittel, entsprechende Beleuchtungsmittel und Herstellverfahren.
Patent
17 Jul 2006
TL;DR: In this article, an agent colorant is considered to be transparent to the longueur d'onde d'une emission de l'agent colorant, i.e., it peut etre induite par la longueure d'deux d'absorption.
Abstract: L'invention concerne des materiaux photoniques comportant des cavites agencees de maniere reguliere, renfermant au moins un agent colorant. Selon l'invention, le materiau de paroi dudit materiau photonique presente des proprietes dielectriques. Ainsi, il n'absorbe sensiblement pas la longueur d'onde d'une bande d'absorption de l'agent colorant respectif, et est sensiblement transparent a la longueur d'onde d'une emission de l'agent colorant, qui peut etre induite par la longueur d'onde d'absorption. En outre, les cavites sont configurees de maniere que le rayonnement de la longueur d'onde de la bande d'absorption faible de l'agent colorant soit stockee dans ledit materiau photonique. Cette invention concerne egalement l'utilisation de ces materiaux photoniques en tant que systemes de substance lumineuse dans un moyen d'eclairage, des moyens d'eclairage correspondants, et des procedes de production.
References
More filters
Journal ArticleDOI
TL;DR: If a three-dimensionally periodic dielectric structure has an electromagnetic band gap which overlaps the electronic band edge, then spontaneous emission can be rigorously forbidden.
Abstract: It has been recognized for some time that the spontaneous emission by atoms is not necessarily a fixed and immutable property of the coupling between matter and space, but that it can be controlled by modification of the properties of the radiation field. This is equally true in the solid state, where spontaneous emission plays a fundamental role in limiting the performance of semiconductor lasers, heterojunction bipolar transistors, and solar cells. If a three-dimensionally periodic dielectric structure has an electromagnetic band gap which overlaps the electronic band edge, then spontaneous emission can be rigorously forbidden.

12,787 citations

Journal ArticleDOI
27 Nov 1998-Science
TL;DR: A design criterion that permits truly omnidirectional reflectivity for all polarizations of incident light over a wide selectable range of frequencies was used in fabricating an all-dielectric omnid Directional reflector consisting of multilayer films.
Abstract: A design criterion that permits truly omnidirectional reflectivity for all polarizations of incident light over a wide selectable range of frequencies was used in fabricating an all-dielectric omnidirectional reflector consisting of multilayer films. The reflector was simply constructed as a stack of nine alternating micrometer-thick layers of polystyrene and tellurium and demonstrates omnidirectional reflection over the wavelength range from 10 to 15 micrometers. Because the omnidirectionality criterion is general, it can be used to design omnidirectional reflectors in many frequency ranges of interest. Potential uses depend on the geometry of the system. For example, coating of an enclosure will result in an optical cavity. A hollow tube will produce a low-loss, broadband waveguide, whereas a planar film could be used as an efficient radiative heat barrier or collector in thermoelectric devices.

1,227 citations

Journal ArticleDOI
TL;DR: In this article, the AlF6/ZnSe multilayer structure developed by means of standard optical technology was found to have a reflection coefficient of more then 99% in the range of incident angles 0°-86° at the wavelength of 632.8nm for s-polarization.
Abstract: AlF6/ZnSe multilayer structure developed by means of standard optical technology. The structure was found to have a reflection coefficient of more then 99% in the range of incident angles 0°-86°at the wavelength of 632.8 nm for s-polarization. The results are likely to stimulate new experiments on photonic crystals and controlled spontaneous emission.

300 citations