A light-emitting diode (LED) is based on a forward-biased heterojunction and emits narrow-band radiation whose wavelength is determined by the bandgap of the semiconductor material. Recently-developed white LEDs are typically based on blue LEDs (InGaN, indium gallium nitride) coated with doped YAG (yttrium aluminum garnet) crystals which act as a phosphor, down-converting part of the blue radiation to a broad spectrum centered in the yellow. The resulting spectral mix has appearance of white light to the human eye. Shown here is a white LED shining on a red screen. (Aug 2007)
| px | px | dpi | = | cm | x | cm | = | MB |
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Creative#:
TOP22288080
Source:
達志影像
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RM
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須由TPG 完整授權
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