Author/Authors :
Chun، نويسنده , , A.R. and Kim، نويسنده , , S.H and Kim، نويسنده , , M.S. and Kim، نويسنده , , C.G and Lee، نويسنده , , S.J. and Kwon، نويسنده , , T.W. and Park، نويسنده , , D.K. and Cho، نويسنده , , S.J. and Lee، نويسنده , , J.G. and Lee، نويسنده , , S.H and Guo، نويسنده , , Z.X. and Woo، نويسنده , , H.S.، نويسنده ,
Abstract :
We have fabricated highly efficient polymeric light-emitting diode (PLED) from water soluble non-conjugated polymer, polyurethane (PU), by using it as an ultra-thin insulating layer on the top of commercially available blue-emitting polymer, polyfluorene (PFO). The device with PU layer showed a maximum external quantum efficiency of 1.3% while the one without PU layer showed the efficiency of 0.6%. We propose that the better performance in PLED with PU layer was due to a well-balanced charge injection in emitting layer after the effective hole accumulation at the PFO/PU interface and thus increase in electron tunneling from cathode metal to emitting polymer.
