Sunday, February 05, 2006

LEDstravaganza Part II

Sample: A bicolor LED.
Source: CompUSA, Littleton, CO

This LED is an interesting one. It has several modes, both flashing and steady. It has two colors, one white and the other UV.

The interesting thing is that LEDs cannot produce white light; their emission happens in very tight spectral regions. So, in order to produce "white" light is to take the same tactic as fluorescent lights. Take a narrow UV wavelength, and use it to excite a phosphor that gives the nice white light.

Bicolor LED, 10x.

UV Led, 60x.

White LED, 60x.

Lit White LED, 60x. You can see the UV emitter underneath the phosphor coating!


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