A novel self-recoverable mechanoluminescent phosphor Ca5Ga6O14∶Eu3+was developed by the high-tem-perature solid-state reaction method,and its luminescence properties were investigated.Ca5Ga6O14∶Eu3+can produce red mechanoluminescence,and importantly,it shows good repeatability.The mechanoluminescence of Ca5Ga6O14∶Eu3+re-sults from the piezoelectric fieldgenerated inside the material under stress,rather than the charge carriers stored in the traps,which can be confirmed by the multiple cycles of mechanoluminescence tests and heat treatment tests.The mechanoluminescence color can be turned from red to green by co-doping varied concentrations of Tb3+,which may be meaningful for encrypted letter writing.The encryption scheme for secure communication was devised by harness-ing mechanoluminescence patterns in diverse shapes and ASCII codes,which shows good encryption performance.The results suggest that the mechanoluminescence phosphor Ca5Ga6O14∶Eu3+,Tb3+may be applied to the optical infor-mation encryption.
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