Multiple Photonic Responses in Organic Magnetic Semiconductor V(TCNE)x(x ~ 2)

A multiphotonic response in organic magnetic semiconductor V(TCNE) x (x ~ 2) with a substantial increase of conductivity induced by light (lambda=457.9 nm) is reported. Substantial decrease in activation energy for electronic hopping is due to temperature dependence of resistivity. Photoinduced effects that originated from structural changes triggered by pirarrpi* excitation in (TCNE) ldr- molecules, which leads to modulation of the magnetic exchange energy J and the activation energy DeltaE, is proposed. This mechanism for multiphotonic responses is supported by photoinduced IR studies.