We investigate the influence of annealing conditions on the physical properties of thin films of poly(3,4‐ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS). In particular, we describe how annealing temperature, the ambient gas, and choice of dopant affect the conductivity, morphology, and work function of the films. Two specific dopants are considered, sorbitol and glycerol, and broad guidelines are developed for using PEDOT/PSS as a hole‐injection electrode in polymeric light‐emitting devices, solar cells, and photodetectors.

The authors report the fabrication of organic light-emitting diodes based on N,N′-di-1-naphthalenyl-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (NPB) that emit via singlet excimer states. When the film deposition rate of NPB is reduced from 17to1nm∕min, they observe a reduction in intensity of the photoluminescence peak at 437nm and the evolution of a new, broader peak at 503nm. From optical absorption and time resolved photoluminescence data the authors attribute this new peak to singlet excimer emission. The authors demonstrate green electroluminescence from organic diodes that utilize this effect. The possible morphological variations resulting in the monomer to excimer transition are discussed.