Jpn. J. Appl. Phys. 48 (2009) 070208 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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On the Requirements for Achieving Angular Homogeneity in Phosphor Converted High Power Flip-Chip Light-Emitting Diodes

Christian Sommer, Joachim R. Krenn, Paul Hartmann1, Peter Pachler1, Marko Schweighart1, Stefan Tasch1, Günther Leising2, and Franz P. Wenzl

Institute of Nanostructured Materials and Photonics, Joanneum Research Forschungsges. mbH, Franz-Pichler Straße 30, A-8160 Weiz, Austria
1LEDON Lighting Jennersdorf GmbH, Technologiepark 10, A-8380 Jennersdorf, Austria
2Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria

(Received December 23, 2008; revised April 28, 2009; accepted May 12, 2009; published online July 6, 2009)

We show numerical results based on optical ray-tracing which indicate the prerequisites for achieving angular homogeneity of the white light emitted from high power light-emitting diodes (LEDs) in flip-chip configuration. Since the two light sources that comprise the white light, the blue LED light and the yellow phosphor-converted light, have different natures, the top height and the lateral width of the phosphor coating as well as its phosphor concentration have to be precisely adjusted in order to achieve similar irradiance and/or radiant intensity distributions of both the blue and yellow light on a detector surrounding the white LED light source.

DOI: 10.1143/JJAP.48.070208

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