We review the history of the long-lasting phosphorescent(LLP)materials and present its recent progress in this article. Some questions of the LLP materials

such as its phosphorescent mechanism

are also discussed. Basing on the principle of the abnormal-valence chemistry of lanthanide

we summarize the action of rare earth ions in LLP materials and present our idea on the designing of LLP materials. At last

we give our opinion on the probable development of LLP materials in future.