Intense two-photon upconversion fluorescence was investigated under the excitation of a 974 nm diode laser at room temperature.

The intensity of the upconversion fluorescence of the two kinds of glasses was discussed,which showed that it becomes stronger with the addition of the halide.

Rare earth ions doped tellurite glasses are kinds of upconversion fluorescence materials which have good application prospect.

Blue and green upconversion luminescence of Er~3+ in ZrF_2SiO_2;

Energy transfer and upconversion luminescence of Tm~(3+)/Yb~(3+) co-doped lanthanum-zinc-lead-tellurite glasses;

The upconversion luminescence research of HoYb:YVO_4;

Intense blue upconversion fluorescence of Tm ~(3+) /Yb ~(3+) -codopedbismuth tellurite glasses;

Two-photon absorption and upconversion fluorescence by using a femtosecond Ti:sapphire laser in symmetrical chromophores;

When pumped with 800 nm laser irradiation,topic compound shows strong two-photon induced yellow-green upconversion fluorescence.

Synthesis of Y_2O_3:Yb,Er nanocrystals by complex precipitation method and its up-conversion luminescence properties;

Investigation on up-conversion luminescence of Tm~(3+) and Yb~(3+) codoped oxy-fluorosilicate glass ceramics;

Quantum effect and up-conversion luminescence of ZnO-SiO_2 composite films synthesized by sol-gel technique