emitting phosphorescent crystal has a strong

Energy levels due to a wealth of rare earth elements and 4f electron transitions and other electronic structure of particularity with optical , electrical,Glow in the dark pebbles and many other features . This material has a long afterglow time , high brightness , the chemical stability advantages. The new rare-earth Luminescence research and development, not only promote China 's rare earth resources comprehensive utilization of the resource  photoluminescent pigment economic advantages, but it does not require power can be light, so it is a kind of energy-saving products . Wen Shao Faguang intermediary mechanism ﹑ factors and trends.