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  It's possible it's an upconverting phosphor that absorbs two infrared 
photons and emits one visible photon.

On 4/29/2011 8:42 AM, Craig Brideau wrote:
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> It emits the same color of green, at least by my eye.  This would make sense
> if it was an anti-stokes material.  Excitation wavelength shouldn't alter
> emission wavelength of a stokes shift process, either up or down, correct?
>
> Craig
>
>
> On Fri, Apr 29, 2011 at 1:31 AM, Jeremy Adler<[log in to unmask]>wrote:
>
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>>   what happens when you shift the excitation wavelength ?
>>