Figure 4

Correlation of PL QY, valence ratio (Cu+/Cutotal), and Cu+ concentration value as a function of Cu concentration. Open and closed symbols indicate Cu-Ar and Cu-air specimen, respectively.

Correlation of PL QY, valence ratio (Cu+/Cutotal), and Cu+ concentration value as a function of Cu concentration. Open and closed symbols indicate Cu-Ar and Cu-air specimen, respectively.