The term was first coined by Russian chemist V. Pletz in 1935 and originally mistranslated in some articles as plosophore. Also of note is an auxoexplose concept (similar to chromophore and auxochrome concept), which is a group that modifies the explosive capability of the molecule. 
The term explosophore has been used more frequently after its use in books such as Organic Chemistry of Explosives by J. Agrawal and R. Hodgson (2007)'.