Koninklijke Philips Corporation N.V.

Lumileds LLC

Philips Lighting Holding B.v.

Philips Lumileds Lighting Company LLC

Koninklijke Philips Electronics N.v.

Lumileds Holding B.v.

Philips Intellectual Property & Standards Gmbh

Hans-Helmut Bechtel

Peter Josef Schmidt

Matthias Heidemann

Wolfgang Busselt

Walter Mayr

Joerg Meyer

Baby-Seriyati Schreinemacher

Oleg Borisovich Shchekin

Thomas Diederich

Michael Ragan Krames

Gerd O Mueller

Thomas Juestel

Regina B Mueller-Mach

Joachim F Opitz

Detlef Uwe Wiechert

Jens Meyer

Harald Glaeser

April Dawn Schricker

Kenneth John Vampola

Volker Weiler

Wouter Anthon Soer

Erik Maria Roeling

Theo Arnold Kop

Joerg Feldmann

Matthias Wendt

Jan De Graaf

Ronja Missong

Gerd Mueller

Danielle Chamberlin

Regina Mueller-Mach

Markus Heinrich Klein

Bernd Ackermann

Martinus Petrus Joseph Peeters

Dietrich Bertram

Antonio Lopez-Julia

Marcus Jozef Henricus Kessels

Christoph Martiny

Johannes Willem Herman Sillevis Smitt

Uwe Mackens

Bernd Hofmann

Kim Kevin Mai

Joost Peter Andre Vogels

Marinus Johannes Petrus Maria Van Gerwen

Harald Gl&auml;ser

Marcel Van Gerwen

Marcellinus Petrus Carolus Michael Krijn

Cornelis Reinder Ronda

Siebe Tjerk De Zwart

Achim Hilgers

Herbert Friedrich Boerner

Erik Paul Boonekamp

Hans Nikol

Teunis Willem Tukker

Parijat Deb

Yourii Martynov

Egbert Lenderink

Peter Alexander Duine

Aldegonda Lucia Weijers

David Eves

Danielle Russell Chamberlin

Nijs Cornelis Van Der Vaart

Thomas J&uuml;stel

Martijn Henri Richard Lankhorst

Thomas Justel

Lingli Wang

Ulrich Hechtfischer

Volker Van Elsbergen

Martin Weibrecht

Martin Gerard Hendrik Hiddink

Hans-Peter Stormberg

Theunis S Baller

Cornelis Jojakim Jalink

Antonius Hendricus Maria Holtslag

Stefan Peter Grabowski

Marco Van As

Thomas Jüstel

Hendrikus Bernardus Van Den Brink

Georg Friedrich Gaertner

Peter J Quadflieg

Olaf Mastenbroek

Marc Salsbury

Henricus Franciscus Johannus Jacobus Van Tongeren

Oliver Steigelmann

Rainald Gierth

Niels Jeroen Van Der Veen

Jorg Meyer

Petra Huppertz

Philippa C Wagner

Patrick Henricus Johannes Van Stijn

Oscar Arturo Chao Pujol

Claudia Goldmann

Klemens Brunner

Sumit Gangwal

Silvia Golsch

Jean Paul Jacobs

Gregoire Denis

Guido Salmaso

Jordy Bernard Margreth Schoenmaekers

This specification discloses pcLEDs in which the wavelength converting structure comprises one or more layers of phosphor particles disposed on a transparent substrate at high packing density. The particles are coated with an inorganic non-absorbing layer which mechanically stabilizes the phosphor particle layers and provides a thermally conductive connection between the phosphor particles. The wavelength converting structure is attached to a semiconductor LED die with the transparent substrate of the wavelength converting structure facing away from the die by a thin glue layer that bonds a light emitting surface of the die to the phosphor particle layers. Methods for fabricating such pcLEDs are also disclosed.

Thin compact wavelength converting structure for pcLED

A light emitting device is disclosed and includes an emission source configured to emit a primary blue light and a wavelength-converting element configured to convert the primary blue light to a secondary light, where the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm. The device may have a correlated color temperature (CCT) in the range of 1600K-2500K, may exhibit a melanopic/photopic ratio less than 0.25 and/or may exhibit a radiometric power fraction of light having a wavelength below 530 nm below 0.1.

Light emitting device with improved warm-white color point

An optical coupling structures are disposed on light output surfaces of semiconductor LEDs of a miniLED or microLED array to facilitate coupling of light emitted by the semiconductor LEDs through the light output surfaces. The optical coupling structures comprise light scattering particles and/or air voids embedded in or coated with a thin layer of a material that has an index of refraction close to or matching the index of refraction of the material forming the light output surface of the semiconductor LEDs.

Optical coupling layer to improve output flux in LEDs

In a method according to embodiments of the invention, for a predetermined amount of light produced by a light emitting diode and converted by a phosphor layer comprising a host material and a dopant, and for a predetermined maximum reduction in efficiency of the phosphor at increasing excitation density, a maximum dopant concentration of the phosphor layer is selected.

Wavelength converted light emitting device

A light emitting device comprises a first group of one or more LEDs each configured to emit light having a blue color point in the 1931 CIE x,y Chromaticity Diagram, a second group of one or more LEDs each configured to emit light having a cyan or yellow color point in the 1931 CIE x,y Chromaticity Diagram, and a third group of one or more LEDs each configured to emit light having a red color point in the 1931 CIE x,y Chromaticity Diagram.

LED and phosphor combinations for high luminous efficacy lighting with superior color control

Embodiments include a device having a micro-LED that includes at least two, individually addressable light emitting diodes on a same substrate; a phosphor converter layer disposed on the micro-LED, the phosphor converter layer including phosphor particles having a D50 of greater than 1 &#x3bc;m and less than 10 &#x3bc;m.

Phosphor layer for micro-LED applications

A particle layer is positioned over a light output surface of a light emitting diode. A transparent protection layer positioned between and in contact with the light output surface and the particle layer. The particle layer comprises a multitude of optically scattering or luminescent particles and a thin coating layer of transparent material coating particles of the multitude. The particles are characterized by a D50 greater than about 1.0 &#x3bc;m and less than about 30. &#x3bc;m; the coating layer has a thickness less than about 0.20 &#x3bc;m. The protection layer is less than about 0.05 &#x3bc;m thick and includes one or more materials different from material of the coating layer. The protection and coating layers can each include one or more metal or semiconductor oxides. Oxide precursor reactivities, with respect to the corresponding light output surface, are less for protection layer material than for coating layer material.

Protection layer for a light emitting diode

The invention describes a light conversion device having a light converter, which is adapted to convert primary light to converted light, so that a peak emission wavelength of the converted light is in a longer wavelength range than a peak emission wavelength of the primary light. The light conversion device also has a reflective structure coupled to at least a part of a coupling surface of the light converter, where the reflective structure is a narrowband reflector arranged to reflect at least some of the primary light impinging on the reflective structure and to transmit at least some of the converted light impinging on the reflective structure.

Reliable light conversion device for laser-based light sources

Embodiments include a device having a component with a component surface; a phosphor converter body with a phosphor converter body surface facing the component surface; a plurality of particles between and in contact with the component surface and the phosphor converter body surface; and an inorganic coating on and in contact with at least a portion of the particles, at least a portion of the component surface, and at least a portion of the phosphor converter body surface, and a method making such device.

Bonding of phosphor converter emitters

A light emitting device is disclosed and includes an emission source configured to emit a primary blue light and a wavelength-converting element configured to convert the primary blue light to a secondary light having a correlated color temperature (CCT) in the range of 1600K-2500K and color rendering index (CRI) in the range of 40-60, the wavelength-converting element including a red phosphor material having a peak emission wavelength that is less than 620 nm and a green phosphor material having a peak emission wavelength that is greater than 530 nm. The device may exhibit a melanopic/photopic ratio of less than 0.25 and/or may exhibit a radiometric power fraction of light having a wavelength below 530 nm below .1.

A disclosed light-emitting device may provide white light with a cyan gap coinciding with a melanopic sensitivity range and thus having reduced melanopic content. The disclosed light-emitting device may include a light source providing violet or blue light with a peak wavelength under 450 nanometers (nm). The disclosed light-emitting device may include at least one down-converter coupled to and located downstream of the light source and configured with a long-wavelength onset to convert the spectrum of the violet or blue light to generate white light with a spectral power content in a 447-531 nm wavelength range that is less than or equal to 10% of a total spectral power content in a 380-780 nm wavelength range. The disclosed light-emitting device may be incorporated in a light engine system that further includes a control system that controls a drive current to the light-emitting device.

Lighting system having reduced melanopic spectral content

A light emitting diode (LED) device may include an LED die having a first surface on a substrate. A first phosphor layer may be formed on a second surface and sides of the LED die. The second surface may be opposite the first surface. A second phosphor layer may be formed on the first phosphor layer. The second phosphor layer may have a peak emission wavelength (L2) located between a peak emission wavelength of the LED die (LD) and a peak emission wavelength of the first phosphor layer (L2).

Phosphor converted LED with high color quality

The invention provides a lighting device configured to provide white lighting device light, the lighting device comprising (i) a light source, configured to provide blue light source light, and (ii) a luminescent material element, configured to absorb at least part of the blue light source light and to convert into luminescent material light, wherein the luminescent material element comprises a luminescent material which consists for at least 80 wt. % of a MEuSiAlONphosphor, wherein M comprises one or more of Mg, Ca, Sr, Ba, with a molar ratio of (Mg+Ca+Sr)/(Ba)&#x2264;0.1, wherein x is in the range of 0.001-0.02, wherein y is in the range of &#x2264;0.2, and wherein the white lighting device light comprises said blue light source light and said luminescent material light.

Phosphor converted LED

Growing community of inventors

Roetgen, Germany

Hans-Helmut Bechtel