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'White light LEDs - spectrum?'
2005\08\19@143354 by Debbie

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PICers - just curious about "White LEDs" that you see in the catalogues. Are
they truly broad spectrum white-light, as in daylight or from a fluoro tube? Or
is it some trick they do by combining narrow band R,G,B emissions?
Thanks - Debbie :)


       

       
               
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2005\08\19@151107 by Harold Hallikainen

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Have a look at a datasheet on one. They are not broad spectrum. I believe
they generally have a blue LED with phosphors excited by the blue to get
other colors.

Harold


> PICers - just curious about "White LEDs" that you see in the catalogues.
> Are
> they truly broad spectrum white-light, as in daylight or from a fluoro
> tube? Or
> is it some trick they do by combining narrow band R,G,B emissions?
> Thanks - Debbie :)
>

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2005\08\20@133551 by Peter

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On Sat, 20 Aug 2005, Debbie wrote:

> PICers - just curious about "White LEDs" that you see in the catalogues. Are
> they truly broad spectrum white-light, as in daylight or from a fluoro tube? Or
> is it some trick they do by combining narrow band R,G,B emissions?
> Thanks - Debbie :)

Most are broad spectrum with a uv peak where the led is. You could build
a cdrom diffraction grating spectrometer and find out (for an immediate
response shine white led onto cdrom, after drawing a slit on it with
felt tip pen, and see what comes out).

Peter

2005\08\21@021437 by Vasile Surducan

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On 8/21/05, Debbie <spam_OUTcyberia429-piclistTakeThisOuTspamyahoo.com.au> wrote:
>
> --- Spehro Pefhany <.....speffKILLspamspam@spam@interlog.com> wrote:
>
> > At 04:36 AM 8/20/2005 +1000, you wrote:
> > >PICers - just curious about "White LEDs" that you see in the catalogues.
>
> > ...
> > Typically, they use a phosphor and a blue LED die to get white-ish light.
>
> Thanks guys - phosphor, eh? Figure - LEDs are basically single freq

It would be damn good . Unfortunately they have a bandwidht of about 10-20nm.

Vasile

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