Figure 3.

Detection of singlet oxygen luminescence from BPD-MA samples with different concentrations. (a) Images of BPD-MA dissolved in 75% ethanol with the concentration of 0.125, 0.25, 0.5, 1.0, 2.0, and 4.0 μg/ml from the top left to bottom right. The top images use colorbar ranging from 0 to 70 and the bottom images have a color bar ranging from 0 to 400. (b) The dependence of average ${}^1{\mathrm{O}}_2$ signal intensity on the concentration of BPD-MA samples derived from (a), the linear fitting give an r² value of 0.993, and the error bars represent the standard deviation of three samples with the same concentration in each concentration.