It was found that the upconverted luminescence was produced by energy transfer upconversion(ETU) process with ~1D_2 as intermediate state.

• 通过研究上转换荧光的衰减曲线、吸收谱、激发谱和上转换荧光强度与泵浦激光单脉冲能量的关系；确定了以1D2为中间态的能量转移上转换主要是上转换机制.