Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 72: Nitrides: Devices

HL 72.6: Vortrag

Donnerstag, 23. März 2017, 11:15–11:30, POT 06

Time-resolved spectral characterization of white LEDs for car-to-x communication — •Vanessa Simon, Matthias Wachs, and Ulrich T. Schwarz — Chemnitz University of Technology, Experimental Sensor Science, Reichenhainer Str. 70, 09126 Chemnitz

Sensor development, car-to-car and car-to-environment (car-to-x) commonucation became a fast growing research area over the last years. A new approach could be car-to-x communication by means of white LEDs. This principle of data transmission was demonstrated by H.L. Minh et al. [1] in their Visible Light Communication (VLC) System. They achieved a bandwidth of about 50 MHz.

The aim of our attempt is to examine this system for different LEDs of their suitability for car-to-x communication. Therefore we investigate the switching behavior of gallium nitride and the phosphor converter with a time-resolved spectroscopy setup using a streak camera as detector. This measurement setup allows to determine the rise and fall time of the blue LED and the phosphor converter separately. The studied devices are warm-white and cold-white LEDs from Osram and Nichia. The measured rise and fall time of gallium nitride and the phosphor converter are compared to measurements similar to the experiment from H.L. Minh et al. [1] using a photodiode and band pass filters.

References: [1] H.L. Minh et al., IEEE Photonic Tech L. 21, 1063 (2009).