Upconversion emission of a Er<sup>3+</sup>-doped glass microsphere under 633 nm excitation.

Jiyou Wang Guorui Ji Peng Jin Lijuan Zhao Cunzhou Zhang Upconversion emission of a Er<sup>3+</sup>-doped glass microsphere under 633 nm excitation. 353-355 2004 35 Microelectronics Journal 4 http://dx.doi.org/10.1016/S0026-2692(03)00244-1 db/journals/mj/mj35.html#WangJJZZ04