Relationship between Structure and Optical Properties in the Mixed-Ion SystemNa+/Ce3+/Nd3+ Beta-Alumina

摘要

For several years now, it has been known that the lanthanide Beta -aluminas areinteresting as lasers, phosphors and in other opto-electronic devices; see references therein. A number of structural studies have been made (X-ray diffraction and high-resolution electron microscopy) in an attempt to provide a structural basis for understanding the optical properties of these systems. More recently, it has been found that the creation of a so called sensitizer-activator pair serves to enhance energy transfer efficiency of the optical system. Thus, by adding Ce3+ to the Nd3+-containing Na+/Nd3+Beta-alumina crystals, it has been demonstrated that a higher pumping efficiency of the 1.06 micrometer line can be obtained. Ce3+ has a highly allowed 4f-5d electronic transition which is resonant with some of the weaker adsorptions of Nd3+.