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Mechanoluminescence; triboluminescence; photoluminescence; manganese complexes

Intense and unique type of mechanoluminescence (ML) is found in tetrahedral manganese (II) complexes. During the excitation of ML by the impact of a piston onto the crystal, the ML intensity initially increases with time, attains a maximum value and then decreases. After retardation of the piston, the decay rate of ML is faster during crystal deformation; however, its value decreases after cessation of the deformation and becomes equal to the decay rate of phosphorescence. The ML disappears below the melting point. Since the crystals of tetrahedral manganese (II) complexes are centrosymmetric, the local non-centrosymmetric sites near the defects are attributed to be responsible for the mechanoluminescence excitation.

B P Chandra¹ M S K Khokhar¹ R S Gupta¹ B Majumdar^{1 2}

1. Department of Physics, Rani Durgavati University, Jabalpur - 482 001, India
2. Department of Physics, Government Science College, Raipur - 492 002, India

Published

October 1987

Manuscript received

7 August 1986

Manuscript revised

24 June 1987