We present electroabsorption spectroscopy to measure the internal electric field in green phosphorescent polymer light-emitting-diodes with crosslinked interlayer between PEDOT:PSS and emissive layer. The phenomenon of trapped electrons screening the bulk semiconductor from the external field can explain the efficiency improvement by adding a 5-30 nm MUPD film near the anode. © 2007 SID.
|Original language||English (US)|
|Title of host publication||Digest of Technical Papers - SID International Symposium|
|Publisher||Society for Information Display|
|State||Published - Jan 1 2007|