Cree Gmbh

Ci Holdings C.v.

Nalini Gupta

James Ibbetson

Bernd P Keller

Kurt S Wilcox

Antony Paul Van De Ven

John K Roberts

Michael John Bergmann

Benjamin A Jacobson

Michael S Leung

Ashish Ekbote

David Clatterbuck

Charles Draper

Combinations of solid state light emitters, optionally arranged to stimulate one or more lumiphoric materials, are used to illuminate surfaces (e.g., upright surfaces) including printed material produced with CMY or CMYK inks. Vibrancy and/or efficacy may be enhanced by increasing the effective steepness of printed ink reflectance wavelength boundaries by illuminating printed material with solid state light emitters of multiple colors having tailored boundaries (e.g., increased separation between colors and/or increased energy in spectral areas highly reflected by CMY inks, or reducing energy of emissions at wavelengths to which the human eye is less sensitive). Lighting devices may include multiple operating modes having different gamut properties (e.g., relative gamut values). One or more subregions of an upright surface bearing printed material may be preferentially illuminated with an array of solid state light emitters including multiple emitters having different peak wavelengths.

Lighting devices including solid state emitter groups for illuminating printed material with enhanced vibrancy

The present disclosure is directed to LED components, methods and systems using such components, having light emitter devices with emissions tuned to meet CRI and LER goal values at a defined CCT. These emitter devices and methods may use a combination of light emitting diodes and quantum dots to tune the emission to meet these criteria. The quantum dots may incorporate additional features to protect the quantum dots from environmental conditions and improve heat dissipation, such as coatings and thermally conductive features.

Quantum dot narrow-band downconverters for high efficiency LEDs

A LED lamp includes a plurality of red LEDs and a plurality of blue LEDs, a phosphor covering at least the plurality of blue LEDs, where the lamp has an LPW of at least 200 in a steady state operation.

High efficiency LED lamp

Solid state light emitting apparatuses include blue LEDs (e.g., including short wavelength and long wavelength blue LEDs in combination) to stimulate green lumiphors, with supplemental emissions by red lumiphors and/or red solid state light emitters, to provide aggregate emissions with high S/P ratio (e.g., &#x2267;1.95) and high color rendering values (e.g., &#x2267;85), preferably in combination with high brightness and high luminous efficacy. In certain embodiments, a light emitting apparatus may be devoid of a LED having a peak wavelength of from 470-599 nm and/or devoid of lumiphors with peak wavelengths in the yellow range. Multiple LEDs may be arranged in an emitter package. A fabrication method includes mounting multiple solid state emitters (e.g., with a first blue and a second red emitter) to a common substrate, applying a stencil or mask over the second emitter, applying a lumiphoric material over the first emitter, and removing the stencil or mask.

Solid state lighting apparatus with high scotopic/photopic (S/P) ratio

Growing community of inventors

Santa Barbara, CA, United States of America

Nalini Gupta