On the Adjustment of the Color Temperature of White Light-Emitting Diodes by Femtosecond Laser Patterning

Author

Wenz, Franz P. ; Kuna, Ladislav ; Sommer, Christian ; Reil, Frank ; Krenn, Joachim R. ; Pachler, Peter ; Hartmann, Paul

Author_Institution

Inst. of Surface Technol. & Photonics, Joanneum Res. Forschungsges.mbH, Weiz, Austria

Volume

23

Issue

2

fYear

2011

Firstpage

124

Lastpage

126

Abstract

We show that femtosecond (fs) laser microstructuring of light-emitting diode (LED) encapsulates has a high potential for the fine-tuning of the color temperatures of white LED packages. The number of scattering centers that are fabricated within the volume of the encapsulate allows the precise adjustment of the color temperature of the device to the desired value. This opens possibilities to achieve color reproducibility among individual LED packages with highest accuracy.

Keywords

high-speed optical techniques; laser materials processing; light emitting diodes; micro-optics; microfabrication; optical fabrication; color temperature; femtosecond laser microstructuring; femtosecond laser patterning; light scattering; light-emitting diode encapsulates; optical fabrication; Color; Light emitting diodes; Materials; Optical device fabrication; Phosphors; Scattering; Ultrafast optics; Femtosecond laser structuring; light-emitting diodes (LEDs); lighting;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2092760

Filename

5638121