Top-emitting yellow light polymer light emitting diodes (PLEDs) were fabricated on the FR4 board for future application in optical interconnects A 100 pm thick glass plate with sputtered Ag films on the back side for light reflection was bonded to the board for smooth surface The PLED had a structure of indium tin oxide / poly(3 4-ethylenedioxythiophene)poly(styrenesulfonate)/phenyl substituted polypa raphenylene-vinylene/Ba/Ag and reached the brightness of 4528 cd/m(2) with a corresponding current efficiency of 7 cd/A. A small AC signal Imposed onto a DC bias was employed to characterize the electroluminescence delay time and hole mobility in the PDY-132 super yellow films Published by Elsevier B V