Development of new elasticoluminescent material SrMg2(PO4)2:Eu

► Developed a new elasticoluminescent material SrMg2(PO4)2:Eu. ► SrMg2(PO4)2:Eu emits strong purple light upon compression. ► Proposed the elasticoluminescence model of SrMg2(PO4)2:Eu. ► Elasticoluminescence process is intimately related to the charge trap.