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8318111 
Journal Article 
Multiple emissions from 1,3-diphenyl-5-pyrenyl-2-pyrazoline nanoparticles: Evolution from molecular to nanoscale to bulk materials 
Fu, H; Loo, BH; Xiao, D; Xie, R; Ji, X; Yao, J; Zhang, B; Zhang, L 
2002 
Yes 
Angewandte Chemie (International Edition)
ISSN: 1433-7851
EISSN: 1521-3773 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
41 
962-965 
English 
Tunable, multiple emission is exhibited by nanoparticles of 1,3-diphenyl-5-pyrenyl-2-pyrazoline (DPP; see picture), which ranges from near-UV to green. Tuning could be effected by alteration of either the excitation wavelength or the nanoparticle size. In contrast, DPP in dilute solution only showed the emission characteristics of the pyrene chromophore. In bulk crystals, only the emission characteristics of the pyrazoline chromophore were exhibited. 
Charge transfer; Fluorescence; Nanostructures; Photochemistry