Temperature dependence of the fluorescence spectrum of p-HBDI 8x106 77K 7×106 90K 500≥58c0 ··100K 6x10 110K 5x1 120K 3X10 三1×10 400420440460480500520540560580 Wavelength /nt Fig. 2. Temperature dependence of the fluorescence spectrum of HBDI in ethanol Haruki niwa et al Proc. Natl. Acad. Sci. USA 1996.93. 13617Haruki niwa et,al Proc. Natl. Acad. Sci. USA 1996 ,93, 13617 Temperature dependence of the fluorescence spectrum of p-HBDI