Abstract
A new emission different from the usual excimer emission in pyrene crystal was found at low temperature. Also, an emission at shorter wavelength than the excimer emission band at room temperature was found to originate from the intrinsic monomer structure in the crystal surface. Furthermore, the transfer probabilities of the excitation energies corresponding to the new emission at low temperature and the emission at shorter wavelength than the excimer emission at room temperature to doped perylene molecules were observed by a pulsed method and their temperature dependences were obtained. By the analysis of these results the diffusion coefficient D of the migration of the excitation energy of the former emission was obtained as D = D 0 exp (- E / k T ) ( D 0 =1.5×10 -4 cm 2 sec -1 and E =0.003 eV). On the other hand, the diffusion coefficient D of the excitation energy of the latter emission was given by D =3.6×10 -4 T -1/2 .
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