Intense infrared-to-visible upconversion emissions in Tm3+∕Yb3+ codoped water-free low silica calcium aluminosilicate glasses have been obtained under excitation at 976nm. The results showed that as the pump power/intensity is increased, a reduction of up to one order of magnitude at the 800∕480nm emitted intensity ratio is observed; characterizing what can be denominated as luminescent switching. The physical origin of this switching is discussed and explained in terms of the tailoring of luminescent switchers to operate in a large range of pump powers, what could be used in the development of sensors and networks for optical processing and optical communications.

The spectroscopic characteristics of Er3+-doped lead phosphate glasses have been investigated, and Judd–Ofelt analysis was used to evaluate the effect of increasing the Er3+ content on the glass matrices. The intensity-dependent Judd–Ofelt parameters, Ω(4) and Ω(6), remained constant while Ω(2) decreased. The concentration quenching effect on the lifetime of the Er3+ : 4I13/2 →4 I15/2 (1530 nm) transition is also evaluated as a result of the addition of Er3+ to the lead phosphate glass composition. The observed relatively large reduction in the lifetime reflects the significant effects of non-radiative processes in this system. The potential use of these glasses as photonic devices is also discussed.

Blue luminescence emission around 480 nm through cooperative upconversion from pairs of Yb 3ϩ ions implanted into 60TeO 2 -10GeO 2 -10K 2 O-10Li 2 O-10Nb 2 O 5 tellurite glasses and excited by a cw laser at 1.064 m is demonstrated. Cooperative luminescence emission enhancement owing to the temperature dependent multiphonon-assisted anti-Stokes excitation process of the ytterbium ions is also observed. The experimental results revealed a fourfold enhancement in the cooperative luminescence emission when the sample was heated in the temperature range of 20°C-260°C. The thermally induced enhancement is assigned to the effective absorption cross-section for the ytterbium ions which is an increasing function of the medium temperature.

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Analysis of energy transfer processes in Yb3+-Tb3+ co-doped, low-silica calcium aluminosilicate glasses J. Appl. Phys. 110, 083108 (2011) Photoluminescence of hydrogen amorphous carbon nitrile particles obtained in a 13.56 MHz dusty plasma Appl. Phys. Lett. 99, 091503 (2011) Enhanced effect of Ce3+ ions on 2 m emission and energy transfer properties in Yb3+/Ho3+ doped fluorophosphate glasses J. Appl. Phys. 109, 083535 (2011) Intense near-infrared and midinfrared luminescence from the Dy3+-doped GeSe2-Ga2Se3-MI (M = K, Cs, Ag) chalcohalide glasses at 1.32, 1.73, and 2.67m J. Appl. Phys. 109, 033105 (2011) Strongly enhanced tunable photoluminescence in polymorphous silicon carbon thin films via excitation-transfer mechanism Appl. Phys. Lett. 97, 221113 (2010) Additional information on J. Appl. Phys.