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Here's a photo of one of our 2x3 LEDs laying against a piece of bright-white
Inkjet paper. We've turned down the ambient light so the difference can be
easily seen. The front of the LED is on the right side (it's the yellowish
colored emitting surface that you see in our main picture). This area of the LED
has been "doped" with a color correcting material to bring the wavelength of the
light very close to pure white. On the left side is the "shine-through" that is
shining out the back of the LED's ceramic case. Notice the bluish cast to this
"uncorrected" light. This is more typical of many "white" LEDs. In our
applications, we typically paint the LED housing to prevent any "shine through"
from occurring. We've found that a coat or two of Poly Scale Night Black does an
excellent job of blocking the stray light that is emitted from the sides and
back of LEDs. The added benefit is that this is an acrylic and doesn't attack
anything nor does it conduct electricity (you can paint over the wires and
solder joints without causing a short).
© 2008 Ngineering |