Efficient white-polymeric light-emitting diodes (PLED) were fabricated as a single active
layer containing blue-emitting poly (9, 9-bis (2-ethylhexyl) fluorene-2, 7-diyl) endcapped with
bis (4-methylphenyl) phenylamine;(PF2∕ 6am4), and yellow-orange-emitting iridium [tri-
fluorenyl] pyridine complex [Ir (Fl 3 Py) 3]. The fluorene-like ligands in the blended device
prevent phase segregation and also enhance energy transfer from the polymer host to the
guest due to efficient overlap of wave function (Dexter process) and host singlet emission …