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Abstract: We have studied the effects of Si doping on the near infrared (NIR) luminescence observed in low Bi doped ( 0.1mol% ) glasses and the energy transfer from Yb3+ to Bi. The broadband near infrared can only be observed when Si is introduced in the Bi-doped glass. The origin of this fluorescence can be attributed to Bi ions at low valence. Efficient energy transfer from Yb3+ to Bi NIR active ions is achieved by co-doping of Si. There is an increment of about ~29 times of the emission intensity from Bi-related active center as the Yb3+ concentration varies from 0 to 2.0mol% and the amount of Si is 0.05mol% under 980nm excitation. The possible mechanism of energy transfer from Yb3+ to Bi is also discussed. [Copyright &y& Elsevier]

Abstract: Porous glass with high-SiO2 content was impregnated with Nd ions, and subsequently sintered at 1100°C into a compact non-porous glass in air or reducing atmosphere. Sintering in a reducing atmosphere produced an intense violet–blue fluorescence at 394nm. However, the sintering atmospheres almost did not affect the fluorescence properties in the infrared range. A good performance Nd3+-doped silica microchip laser operating at 1064nm was demonstrated. The Nd-doped sintering glasses with high-SiO2 content are potential host materials for high power solid-state lasers and new transparent fluorescence materials. [Copyright &y& Elsevier]