Green Mechanoluminescence of Ca[sub 2]MgSi[sub 2]O[sub 7]:Eu and Ca[sub 2]MgSi[sub 2]O[sub 7]:Eu,Dy

We discovered that phosphor emits green light under the application of a mechanical stress, a phenomenon known as mechanoluminescence (ML), and this green ML emission can be seen by the naked eye when pressing the sample. The ML showed a similar spectrum as photoluminescence (PL), which indicated that ML is emitted from the same center of ions as PL. Furthermore, the addition of increases the green ML intensity of considerably—approximately two orders of magnitude greater than that of . The formation of many shallow traps may be responsible for this enhancement.