Patent ID: 7897976
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A field-effect transistor type light-emitting device comprising: an electron injection electrode, i.e. a source electrode; a hole injection electrode, i.e. a drain electrode; an emission active member disposed between said source electrode and said drain electrode so as to contact with said both electrodes to form a channel in said emission active member between said both electrodes; and a field application electrode, i.e. a gate electrode, disposed in the vicinity of said emission active member via an electrically insulating member or an insulation gap for inducing electrons and holes in said channel of said emission active member, said field-effect transistor type light-emitting device characterized in that said emission active member is made of a non-doped or donor, acceptor-codoped inorganic semiconductor material having both an electron transporting property and a hole transporting property so that the induced electrons and holes move into said emission active member and are recombined with each other in said channel thereby to emit light, wherein a ratio between a mobility of electrons and a mobility of holes in said inorganic semiconductor material falls within a range of 1/100 to 100, and wherein a carrier concentration in said inorganic semiconductor material is 10