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'[EE]: White LEDs do not always use phosphor'
2006\03\06@110053 by Gus Salavatore Calabrese

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Some one mentioned recently that white LEDs are always constructed as  
a UV LED with a phosphor.  That is no longer true.  For example :



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2006\03\07@024020 by William Chops Westfield

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On Mar 6, 2006, at 8:00 AM, Gus Salavatore Calabrese wrote:

> Some one mentioned recently that white LEDs are always constructed as
> a UV LED with a phosphor.  That is no longer true.

I don't think anyone said "always."  As far as I know, there are
currently three competing technologies for "white" LEDs.

1) Blue LED chip with yellow phosphor.  These are the most common.
2) UV LED chip with broad-spectrum phosphor.
3) separate red/blue/green led chips.

Most of the solutions with separate chips let them be powered
separately for "all-color" capability...

BillW

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