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Philips Lumileds Lighting Company LLC

Herman C Chui

Michael Ragan Krames

Charles K Chui

Stephen Andrew Stockman

Nicolas J Moll

Christopher P Kocot

Gloria E Hofler

Fred A Kish

Nathan Frederick Gardner

Ka Luen Fung

Tun-Sein Tan

A computer-implemented method for recovering one or more active sub-signals from a composite signal of a blind source is provided. The method includes: performing an offline preparing process to generate a lookup table of Continuous Wavelet Transform (CWT)-basic elements (WBEs); when receiving raw data of the composite signal of the blind source, performing a real-time process to recover the one or more active sub-signals of the composite signal according to the lookup table of WBEs by formulating the composite signal by a Realistic Adaptive Harmonic Model (RAHM); and generating analysis data comprising one or more attributes of the active sub-signals.

Method and device for recovering sub-signals from composite signal of blind source

The extraction efficiency of a light emitting device can be improved by making the absorbing device layers as thin as possible. The internal quantum efficiency decreases as the device layers become thinner. An optimal active layer thickness balances both effects. An AlGaInP LED includes a substrate and device layers including an AlGaInP lower confining layer of a first conductivity type, an AlGaInP active region of a second conductivity type, and an AlGaInP upper confining layer of a second conductivity type. The absorbance of the active region is at least one fifth of the total absorbance in the light-emitting device. The device optionally includes at least one set-back layers of AlGaInP interposing one of confining layer and active region. The p-type upper confining layer may be doped with oxygen improve the reliability.

lll-phosphide light emitting devices with thin active layers

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Los Altos, CA, United States of America

Herman C Chui