Author/Authors :
Virgili، نويسنده , , D. and Cocchi، نويسنده , , M. and Fattori، نويسنده , , V. and Sabatini، نويسنده , , Amber C. and Kalinowski، نويسنده , , J. and Williams، نويسنده , , J.A.G.، نويسنده ,
Abstract :
The efficiency of organic exciplex light-emitting-devices (EXLEDs) can be greatly improved by introduction of a phosphorescent sensitizer with a high electronic affinity. In the electron–hole combination process at the electron donor/acceptor interface, solely singlet exciplexes are generated producing the exciplex fluorescence. A phosphor sensitizer allows the formation in the emitter bulk of triplet exciplexes, which yield highly efficient exciplex phosphorescence. As an example, we use a Pt-based phosphor (PtL2Cl) doped into a star-burst amine hole transporting donor (m-MTDATA) and bathophenanthroline (BPT) electron-transporting acceptor system which in a bi-layer EXLED reveals an exciplex high electro-phosphorescence external quantum yield of 2.4% photon/carrier.
