AlGaN-Based Ultraviolet Light Emitting Diode
The brillian spot on the right side is the
body of the ultraviolet Light Emitting Diode
(UV-LED). Blue halo on the left side in an
ordinary name card is the fluorescence excited
by the dominant 346 nm emission. The halo
is more bluish than the spot, because it
is not a simple reflection of visible light
from the UV-LED but a fluorescence.
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