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Figure 3
(a) A PYP crystal yielding green fluorescence under continuous illumination with blue light. (b) Fluorescence emission spectra of a PYP crystal recorded at 100 and 170 K. Superimposed is a (saturated) absorption spectrum collected on the same crystal at 100 K. The arrow highlights the red shift in peak emission wavelength observed as the temperature is raised.

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APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
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