Novel solutions toward improved high power white LED light source

Franz P. Wenzl; Christian Sommer; Ladislav Kuna; Ernst Zinterl; Joachim R. Krenn; Paul Hartmann; Peter Pachler; Marko Schweighart; Stefan Tasch; Günther Leising

doi:10.1117/12.818083

18 November 2008 Novel solutions toward improved high power white LED light source

Franz P. Wenzl, Christian Sommer, Ladislav Kuna, Ernst Zinterl, Joachim R. Krenn, Paul Hartmann, Peter Pachler, Marko Schweighart, Stefan Tasch, Günther Leising

Author Affiliations +

Proceedings Volume 7138, Photonics, Devices, and Systems IV; 71382C (2008) https://doi.org/10.1117/12.818083
Event: Photonics, Devices, and Systems IV, 2008, Prague, Czech Republic

Abstract

Today's most common approach for solid state lighting relies on the conversion of a portion of the blue light emitted from the LED die by an inorganic phosphor material. Although this concept, at a first glance, seems to be rather simple, the appropriate shape of the color conversion element (CCE) in white LED light sources turns out to have essential significance for the quality of the white light (especially in terms of angular homogeneity). In this contribution we discuss recent developments and novel coating concepts for LEDs that excel in terms of spatial homogeneity of the emission and variability of the color temperature, which on the one hand can be attributed to the application of Silicate based phosphors, a beneficial class of luminescent materials for LED application, and on the other hand on optimized CCE geometries, which were obtained by numerical calculations with the help of state-of-the-art simulation tools.

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Franz P. Wenzl, Christian Sommer, Ladislav Kuna, Ernst Zinterl, Joachim R. Krenn, Paul Hartmann, Peter Pachler, Marko Schweighart, Stefan Tasch, and Günther Leising "Novel solutions toward improved high power white LED light source", Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71382C (18 November 2008); https://doi.org/10.1117/12.818083

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