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The effect of vacuum ultraviolet radiation on the valence electronic structure of the electroluminescent organic materials p-sexiphenyl (6P) and tris-(8-hydroxy quinoline) aluminum (Alq 3 ) was investigated by ultraviolet photoemission spectroscopy (UPS). The intense radiation of an undulator at the storage ring BESSY II (Berlin) caused a loss of conjugation in 6P, evidenced by a decrease...
The optical properties of highly oriented films of para-hexaphenyl, a conjugated material which is suitable for blue light emission applications, were investigated. Wave-guiding calculations, with anisotropic optical coefficients were combined with angledependent photoluminescence measurements, and single-layer device electroluminescence. The microstructure of the vacuumdeposited films is controlled...
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