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(Yet) another Intellichip question (for Geoff, Clark, John)

83.84.178.102

Geoff, you've said that the quantum dot on the chip "fluoresce very brightly" which I read as that it emits within the visible spectrum, i.e. at wavelenghts of 375-770 nm).

Color tags like from Evident, which are used for MRI applications, are emitting at wavelenghts between 470-600 nm, customized wavelengths can be designed.

The tags (just like any other quantum dot) MUST be excited at wavelengths shorter than the peak emission wavelength.

Lasers in CD players work at a wavelength of 780 (± 10) nm. They can therefore not excite a standard color tag. I doubt that customized tags are used, but that's an assumption. Such tags can, however, be excited by daylight, but they would be also while resting in their case.

Please explain.

Klaus


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Topic - (Yet) another Intellichip question (for Geoff, Clark, John) - KlausR. 03:09:26 04/01/05 (168)


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