In the paper thermal and luminescence properties of phospho-tellurite glass and glass after thermal treatment doped with NdF3 were presented. The crystallization kinetic of the main crystallization peaks of glass was investigated using differential scanning calorimetry (DSC). The value of the activation energy for crystalline phase (Ec 54,21 ± 5 kJ mol-1) was calculated using Ozawa-Flynn-Wall (OFW), Kissinger-Akahira-Sunose (KAS), Starink and Tang methods. The glass-ceramic was obtained by heat treatment method. The luminescence transitions from levels 4F5/2 → 4I9/2 (878 nm), 4F3/2→4I11/2 (1058 nm), and 4F3/2 → 4I13/2 (1330 nm) in glass and glass-ceramic doped NdF3 were compered.
This paper describes electrical method for measuring junction temperature of high power LEDs. Designed and
constructed system with thermal chamber and performed a number of studies in typical operating conditions luminaires
with LEDs. The results allow for proper construction of a complete LED lighting system using for operation in ambient
temperatures ranging from -10ºC to 100ºC, especially in terms of matching the effective supply.
In the paper the influence of luminescent layer made of tellurite glass doped with Yb3+/Er3+ on parameters of
silicon photovoltaic cell in the near infrared region was investigated. Luminescence properties of the fabricated
glass under 976 nm excitation were measured. As a result of the conducted works enhancement of conversion
efficiency of NIR radiation utilizing upconversion process in tellurite glass doped with RE was obtained.
Parameters of PV cell with active layer: open circuit voltage increase of 5,5% for sample codoped with Yb3+/Er3+
system and 2,7% for sample doped with Er3+, 100% is the signal from pure PV cell illuminated by 976 nm laser.
In this paper the analysis of upconversion luminescence dynamics in tellurite and germanate glasses doped with
Ho3+ and sensitized by Yb3+ in 8:1 molar ratio was presented. Population of energy levels was calculated using
Runge-Kutta method. The influence of pump power (976 nm) radiation on population of excited levels and the
possible upconversion mechanisms were analyzed. The energy transfer coefficient in tellurite glass CD2 = 5,0 x
10-18 cm3/s, CD3 = 1,5 x 10-17 cm3/s and CD4 = 9,0 x 10-17 cm3/s and in germanate glass CD2 = 2,80 x 10-18 cm3/s,
CD3 = 6,35 x 10-18 cm cm3/s and CD4 = 3,56 x 10-17 cm3/s were used to analyze dynamics of upconversion processes.