In this article, we report the synthesis and full characterization of a family of benzophopshole 2a-c substituted by electro-donating amino groups. The nature of the donor allows to fine tune the ICT and thus the optical properties. In particular, the compounds display intense fluorescence in the solidstate. Considering the favorable redox and thermal properties, the compounds were inserted in multilayered OLED devices displaying high efficiency reaching 5% of EQE for compound 2a. This is indeed the theoretical limit of efficiency of purely fluorescent emitters. Ethoxysubstituted benzophopshole oxides thus represent a new class of highly efficient emitters for OLEDs. Insertion of these emitters in organic laser or fast OLEDs will be investigated in the future.