Polymeric Light‐Emitting Diodes Based on Poly(p‐phenylene ethynylene), Poly(triphenyldiamine), and Spiroquinoxaline

摘要: In this paper polymeric light-emitting diodes (LEDs) based on alkoxy-substituted poly(p-phenylene ethynylene) EHO-OPPE as emitter material in combination with poly(triphenyldiamine) hole transport are demonstrated. Different device configurations such single-layer devices, two-layer and blend devices were investigated. Device improvement optimization obtained through careful design of the structure composition. Furthermore, influence an additional electron transporting blocking layer (ETHBL), spiroquinoxaline (spiro-qux), top optimized was investigated using a combinatorial method, which allows preparation number characterized by different thicknesses one deposition step. The maximum brightness increased from 4 cd/m2 for pure to 260 25 % + 75 poly(N,N′-diphenylbenzidine diphenylether) (poly-TPD) emitting/hole-transporting electron-transport/hole-blocking spiro-qux 48 nm thickness.