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Absorption spectrum of the hole transport layer (open squares) and the spectral distribution of the optical gain in MDMO-PPV (filled circles) measured at an excitation density of . The inset shows the chemical structure of: (a) the oxetane-derivatized TPD and (b) the emissive polymer MDMO-PPV.
Normalized emission spectra of MDMO-PPV for various excitation energies between 34 and 153 nJ. Above 53 nJ a narrow emission feature (ASE) is observed at 610 nm.
ASE threshold as a function of the HTL layer thickness for samples in the presence (filled circles) and the absence of ITO (open circles). In addition, the ratio of the confinement factor in the ITO divided by the confinement factor in the MDMO-PPV is shown (crosses).
TE waveguide mode profiles calculated for a wavelength of with varying hole transport layer thickness of: (a) 100 nm and (b) 300 nm. In case (a) 9.5% of the mode is confined in the lossy ITO layer, while in case (b) just 0.8% of the mode is guided in the ITO.
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