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This paper reports a fluorescence enhancement phenomenon concerning the 2-p-nitro-phenyl-5-biphenyloxazole (NPBO). Although the NPBO solution gives only a weak fluores-cence, yet by introducing some nonfluorescence organic amine, e.g. tri-n-butyl amine (TBA)into this solution, the fluorcscence will be enhanced tens or hundreds times through the ir-radiation. This phenomenon is a new one, different from that as stated by other authors.According to the spectral analysis and the kinetics research, its mechanism may be prelimi-narily suggested as follows: the NPBO may absorb the photons to form a certain intermediatewith less polarity, which might react with the amine to form a stronger fluorescence substance.Such a phenomenon may be called the fluorescence photochemical enhancement (FLPCE).In addition, the rate constants of this process are also dotermined.
This paper reports a matter of interest on the 2-p-nitro-phenyl-5-biphenyloxazole (NPBO). Although the NPBO solution gives only a weak fluorescence-cence, yet by introducing some nonfluorescence organic amine, eg tri-n-butyl amine (TBA) into this solution, the fluorcscence will be enhanced tens or hundreds times through the ir-radiation. This phenomenon is a new one, different from that stated by other authors. According to spectral analysis and the kinetics research, its mechanism may be prelimi-narily suggested as follows: the NPBO may absorb the photons to form a certain intermediate with less polarity, which might react with the amine to form a festering fluorescence substance. .In addition, the rate constants of this process are also dotermined.