In this paper

a multifunctional laser-induced time-resolved fluorimeter is described. Basic components of the device are: anactive Q-switched Nd:YAG pumped dye laser(YG581/TDL50) as the excitation light source

a gated vidicon optical multichannel analyzer(WPl/WP2) as the fluorescence detecting equipment

and a electric trigger which made by our laboratory as the external trigger source. The applied software and interface between IBM PC/XT computer and the fluorimeter are designed for data acquisition and data processing of fluorescent spectra.Using the output of frequency tripling of Nd:YAG laser(355nm)

the DBM(dibenzoylmethane) produces very much weaker luminescence in 430-510nm

whereas TOPO(tri-n-octylphosphine oxide) has much stronger luminescence in 365-430nm. The data of luminescence lifetime demonstrate that the luminescence of DBM and of TOPO are phosphorescence and fluorescence

respectively. However

the fluorescence emission of TOPO decreased remarkably in the presence of DBM. The sharp line emission of RE-DBM-TOPO systems is observed

Eu-DBM-TOPO and Sm-DBM-TOPO show very intense emission

whereas Tb-DBM-TOPO shows very weak emission in high concentration. The fluorescence emissions of RE-DBM are very much weaker than those of RE-DBM-TOPO

but the characteristic emissions aren't observed in RE-TOPO. The fluorescence lifetimes of Eu-DBM

Eu-DBM-TOPO

Sm-DBM and Sm-DBM-TOPO are measured to be 100

500

32 and 45us at room temperature using this device

respectively. The fluorescence lifetmes are similar for the different characteristic emission of each chelate. The fluorescence decay curves show exponential decay process for fluorescenc emission of RE-DBM and nonexponential decay process for fluorescence emission of RE-DBM-TOPO.