The first luminescent tetranuclear copper(I) phosphinidene complex [Cu-4(mu
-dppm)(4)(mu (4)-PPh)](BF4)(2) has been synthesized and isolated; the red-
light emitting properties and air-stability of the complex in the solid sta
te may render great potential for this new class of compounds in the future
development of semiconducting luminescence materials and applications in L
ED technology.