Osram Sylvania Inc.

Other

Osram Opto Semiconductors Gmbh

Osram Gmbh

John F Kelso

Walter Peter Lapatovich

Alan Lenef

Angela Eberhardt

Joerg Sorg

Madis Raukas

Alan Piquette

Darshan Kundaliya

Yi Zheng

David W Johnston

Florian Peskoller

James A Avallon

Dennis Sprenger

Nathan M Zink

Kathleen A Lawson

Joachim Wirth-Schön

John Nappi

Madis Raukus

David Johnston

An alumina-based ceramic wavelength converter is described having a surface layer containing a second phase of alumina, preferably as alumina crystallites. The surface layer is formed as a result of the sintering process used to form the bulk ceramic which is itself substantially transparent. The ceramic wavelength converter is combined with a light emitting diode to form a light emitting device. Preferably, the ceramic wavelength converter is comprised of an alumina-based phosphor represented by a general formula ABO:Ce, wherein A is Y, Sc, La, Gd, Lu, or Tb and B is Al, Ga or Sc.

Wavelength converter and light-emitting device having same

There is herein described a method of making a single crystal wavelength conversion element from a polycrystalline wavelength conversion element, a single crystal wavelength conversion element, and a light source containing same. By making the single crystal wavelength conversion element from a polycrystalline wavelength conversion element, the method provides greater flexibility in creating single crystal wavelength conversion elements as compared to melt grown methods for forming single crystals. Advantages may include higher activator contents, forming more complex shapes without machining, providing a wider range of possible activator gradients and higher growth rates at lower temperatures.

Method of making a single crystal wavelength conversion element, single crystal wavelength conversion element, and light source containing same

There is herein described a light source comprising a semiconductor device emitting a primary light, a thermally conductive optic having a reflective coating and a wavelength converter having a front surface and a rear surface. The optic is mounted to the rear surface of the wavelength converter and the primary light impinges on the wavelength converter in an emission region. The wavelength converter converts at least a portion of the primary light into a secondary light that is emitted from the front and rear surfaces of the converter and the optic reflects secondary light emitted from the rear surface back into the emission region. The light source may be used in either transmissive or reflective configurations.

Light source utilizing wavelength conversion

The present invention relates to a luminescent ceramic converter comprising a sintered, monolithic ceramic material that converts a light of a first wavelength to a light of a second wavelength, the ceramic material having substantially spherically shaped pores. The present invention also relates to methods for the manufacture of the luminescent ceramic converter that comprises the ceramic material having substantially spherically shaped pores.

Luminescent ceramic converter and method of making same

There is herein described a luminescent ceramic converter that comprises a flat, monolithic piece of a ceramic material containing a luminescent species wherein a concentration of the luminescent species in a peripheral region of the converter is lower than in a central region of the converter.

Luminescent ceramic converter and LED containing same

A wavelength-converting plate for a wavelength-converted light emitting diode (LED) assembly. The wavelength-converting plate includes multiple layers of microlenses deposited thereon. The microlenses may have an index of refraction different from an index of refraction of the wavelength-converting plate.

LED wavelength-coverting plate with microlenses in multiple layers

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Exeter, NH, United States of America

John F Kelso