The optical properties of Er3+-doped and Yb3+/Er3+ co-doped 12CaO·7Al2O3 (C12A7) poly-crystals,synthesized by high temperature solid state method,were investigated in detail.For Er3+-doped and yb3+/Er3+co-doped C12A7 poly-crystals,two main emission bands centered around 530/550 nm (green) and 660 nm (red) were observed under 980 nm diode laser excitation via an up-conversion process.The intensity of green up-conversion emission had a strong increase in Er3+ (1.0 mol.％,1.5 mol.％,3.0 mol.％),and the intensity ratio of red to green up-conversion emission had an increase in Yb3+ (1.0 mol.％,2.0 mol.％,10.0 mol.％)/Er3+ (fixed at 1.0 mol.％).This detailed study of the up-conversion processes allowed us to identify the dominant up-conversion mechanisms in Er3+-doped and yb3+/Er3+ co-doped C12A7poly-crystals.
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