Supplementary information
Mechanism of mechanical quenching and mechanoluminescence in phosphorescent
CaZnOS:Cu
Dong Tu, Chao-Nan Xu, Yuki Fujio, Akihito Yoshida
Figure S1. The emission spectrum (LS) and the excitation curve (ER) of CZOSC collected by using an integrating
sphere. The excitation curve without sample (ES) was also collected for calculation. The inset shows a magnification
of the emission spectrum. All the spectra used excitation light at 335 nm.
The external and internal quantum yields of CZOSC sample are determined as 7.0% and 8.9%,
respectively. According to the references,1,2 the quantum yields of famous phosphorescent materials
ZnS:Cu and ZnSe:Cu are reported to be 1.9% and 2%-4%, respectively. It indicates that the quantum
yield of CaZnOS:Cu is higher than the Cu-doped materials ZnS:Cu and ZnSe:Cu.
References
1 Klausch A, Althues H, Schrage C, Simon P, Szatkowski Am, et al.. Preparation of luminescent ZnS:Cu
nanoparticles for the functionalization of transparent acrylate polymers. J. Lumin. 2010; 130: 692-697.
2 Suyver JF, Beek T, Wuister SF, Kelly JJ, Meijerink A. Luminescence of nanocrystalline ZnSe:Cu. Appl.
Phys. Lett. 2001; 79: 4222.