Search for long phosphorescence materials by combinatorial chemistry method

The present investigation aims at the systematic search for long phosphores cence materials by the assist of combinatorial chemistry method, Four triva lent rare earth elements such as Dy, Nd, Pr, and Ce were introduced into Sr Al2O4:Eu2+ to constitute appropriate trap levels. The quaternary library wa s achieved by using a tetrahedron-type composition array, and then the long phosphorescence was examined. Another finer screening was also performed b ased on the result from the quaternary system to search for an optimum comp osition. On the other hand, the long decay curves were analyzed based on bo th the second-order process and the tunneling. (C) 2001 The Electrochemical Society.