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Proceedings Paper

Lumiramic: a new phosphor technology for high performance solid state light sources
Author(s): Helmut Bechtel; Peter Schmidt; Wolfgang Busselt; Baby S. Schreinemacher
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Paper Abstract

A new phosphor technology for phosphor converted light-emitting diodes (pcLEDs) is presented. A polycrystalline ceramic plate (LumiramicTM) of Ce (III) doped yttrium gadolinium aluminum garnet (Y,GdAG:Ce) is combined with a blue LED to produce white light in the range of 5000 K correlated color temperature. Scattering and light extraction means of the Lumiramic ceramic color converter plates enable production of reliable and efficient white pcLEDs. Measurement of the optical properties of the Lumiramic plates before the final LED assembly allows pick and place packaging with exact targeting of the desired white color point of the LED. Combination with a red phosphor powder layer, coated onto the Lumiramic plate, results in high quality white pcLEDs with any color temperature required for the general lighting market.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580E (2 September 2008); doi: 10.1117/12.794941
Show Author Affiliations
Helmut Bechtel, Philips Research Europe Aachen (Germany)
Peter Schmidt, Philips Research Europe Aachen (Germany)
Wolfgang Busselt, Philips Research Europe Aachen (Germany)
Baby S. Schreinemacher, Philips Research Europe Aachen (Germany)

Published in SPIE Proceedings Vol. 7058:
Eighth International Conference on Solid State Lighting
Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park, Editor(s)

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