Many studies have been made on the luminescence of chla solution

but the results obtained were often influenced by different experimental conditions. In these

data is relatively difference re-absorption and re-emission of the sample on the luminescence of chla solution was discorvered by us

that influenced very much peaks and intensity of the luminesence in chla solution

but that was diminished by method excited surface layer of the sample. This paper report luminescences of chla solution in ethanol and n-hexane on the different concentration (see Table 1). The resultsshowed same peaks of the luminescence at 663nm and 720nm in chla solution of weeker concentration in ethanol and n-hexane. That appeared same centre of the luminescence excist in both of chla solution in ethanol and n-hexane chla solution in the n-hexane in the concentration of 1×10

-5

M showed the quenching of the luminescence. But chla solution in ethanol showed not apparent regard to concentration qunching of the luminescence (see Fig. 1). Concentration quenching of the luminescence was explaned by the exci plex of chla produced in chla solusion due to interaction of both between activated chla molecule and diactivated chla molecule (see Fig.2). Re-absorption and re emission of the luminescence in chla solution was measured

where different range of the sample was passed the luminescence due to different site of the sample was excited by Ar-laser 488nm. Peak of the luminescence on chla solution at 15000cm

-1

in 1×10

-7

M in ethanol shifed 50cm

-1

. So that re-absorption and re-emission was must noticed in the study on energe spectra of chla molecule.