New Mechanoluminescent Materials with Various Colors
We have discovered that Sr2MgSi2O7:Eu, SrCaMgSi2O7:Eu and Ca2MgSi2O7:Eu phosphors emit blue, blue-greenish and green light under the application of a mechanical stress respectively, called as mechanoluminescence (ML). The ML showed a similar spectrum as photoluminescence (PL), which indicated that ML is emitted from the same center of Eu2+ ions as PL. Such bright lights of ML emission can be observed by the naked eye when pressing these samples.
Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
H. W. Zhang et al., "New Mechanoluminescent Materials with Various Colors", Key Engineering Materials, Vol. 388, pp. 305-308, 2009