Investigation on emitting centers in naphthalene-benzophenone mixed crystals

In this paper we investigate the nature of naphthalene phosphorescence in naphthalene-benzophenone mixed crystals. A first study of this emission with temperature change leads us to assume the presence of isolated naphthalene molecules in naphthalene crystals doped with benzophenone molecules. Then we investigate the benzophenone-naphthalene coupling in these crystals. After a short recall of theoretical results, we show that benzophenone-naphthalene coupling is the same with naphthalene doped crystals as with benzophenone doped crystals. These conclusions confirm the previous statement that there exist isolated naphthalene molecules in naphthalene crystals doped with benzophenone molecules.