Author/Authors :
Greenham، نويسنده , , N.C. and Samuel، نويسنده , , I.D.W. and Hayes، نويسنده , , G.R. and Phillips، نويسنده , , R.T. and Kessener، نويسنده , , Y.A.R.R. and Moratti، نويسنده , , S.C and Holmes، نويسنده , , A.B. and Friend، نويسنده , , R.H.، نويسنده ,
Abstract :
Measurements of absolute photoluminescence (PL) efficiencies have been performed for solid films of several conjugated polymers commonly used for electroluminescence. In poly(p-phenylenevinylene) (PPV), a PL efficiency of 0.27 is measured in samples which show an initial PL decay time-constant of 320 ps. These values indicate that photoexcitation in PPV produces intra-chain singlet excitons with a high quantum yield. The PL efficiencies of derivatives of PPV have been investigated, and efficiencies in excess of 0.4 have been measured for cyano-substituted PPVs.
