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BYSince the tetrahedral Mn(I1) complexes exhibit intense mechanoluminescence (ML) (the luminescence produced during mechanical deformation of solids), their further investigation may be interesting. During the studies of ML in a large variety of Mn(I1) complexes, we found an exception that the crystals of Mn(Ph3P0)2C12 show intense solid state ML; however, theyddo not show photoluminescence. The present paper reports the ML and electroluminescence (EL) of Mn(Ph3P0)2C12 crystals. It is shown that the results on ML and EL may be of great importance in analysing the thermal and electrical excitations of the luminescence centres during the deformation of the crystals. The EL of Mn(1I) complexes has not been studied to date. Fig. 1 illustrates that the ML spectra of Mn(Ph3P0)2C12 crystals a r e almost the same a s their EL spectra. A slight shift towards shorter wavelength is found wavelength (nm) Fig. 1. Mechanoluminescence and electroluminescence spectra of Mn( Ph3PO)ZC12 crystals; (EL excited at an electric field of 100 V, frequency 1 kHz) $ ML,---EL 1 ) Raipur 492002, India.2 ) Raipur 492 01 0, India.

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