有機結晶のなかでの励起エネルギーの移動

抄録

Sensitized luminescence in doped crystals illustrates most directly the occurrence of energy migration. This process can be described with rate equations, just as chemical reactions in fluid solutions. Time-resolved measurements are now possible and they disclose some differences between fluid and crystalline systems. What is unique in crystalline systems is the anisotropy. Anisotropic migration of energy, illustrated by three organic systems (naphthalene, 1, 4-dibromonaphthalene and a clathrate compound thiourea/2, 3-dimethylnaphthalene) is discussed in terms of random walks in a lattice. The idea of exciton percolation is briefly introduced.