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'[EE]: White LEDs do not always use phosphor'
Gus Salavatore Calabrese
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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uses multi chip-on-board (COB) technology to provide a high-power
Precise multicolor mixing is achievable by adjusting each chip
using one blue, one red, and two green power chips. ACULED is
operation in applications including vision systems, architectural
and medical lighting.
For more information, visit: http://link.abpi.net/l.php?20060306A7
William Chops Westfield
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...
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