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• W2002079229 abstract "Photostability measurements at different oxygen partial pressures and light intensities have been made on host-guest films containing amorphous polycarbonate and an organic chromophore with a high second order nonlinear optical figure of merit. We find that the photodegradation quantum efficiency dramatically increases with increasing oxygen partial pressure. At very low oxygen partial pressures (8×10−6 bar) the average number of photons required to photodegrade a chromophore is as high as 2×108 at 655 nm. The photodegradation quantum efficiency in air is observed to decrease with increasing optical intensity. We show that this is due to a reduced oxygen content in the film caused by chromophore photodegradation rather than ground state bleaching. There is an anomalous increase and then decrease in the photoluminescence intensity that cannot easily be explained." @default.
• W2002079229 created "2016-06-24" @default.
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• W2002079229 date "2009-06-01" @default.
• W2002079229 modified "2023-09-27" @default.
• W2002079229 title "The effects of oxygen concentration and light intensity on the photostability of zwitterionic chromophores" @default.
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• W2002079229 doi "https://doi.org/10.1063/1.3143865" @default.
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