Analysis show that the upconversion fluorescence is green one with wavelengths of 538 nm and 514 nm due to excited state absorption(ESA).

• 能级分析和光谱扫描结果表明上转换辐射光为绿色荧光,波长为538 nm和514 nm,其产生机理为铒离子的激发态吸收效应(ESA)。