Modification of luminescence spectra of CaF2:Eu2+.

CaF2:Eu(2+) is a well known phosphor having efficient excitation in the near ultraviolet (NUV) range. Phosphors with NUV excitation are required in newly emerging applications such as photoluminescence liquid crystal displays (PLLCD), solid-state lighting (SSL), and down-conversion for solar cells. However, emission of CaF2:Eu(2+) is around 424 nm.

Luminescence and energy transfer in Ce3+, Mn2+- doped K2AEP2O7 (AE = Ca, Sr) phosphor.

Pyrophosphates K2AEP2O7 (AE = Ca, Sr) prepared by the classical solid-state technique and activated with Ce(3+) are described. Intense emission was observed in K2AEP2O7 (AE = Ca, Sr). The effect of Mn(2+) co-doping was studied.

Luminescence in Li2BaP2O7.

The photo-, thermo- and optically stimulated luminescence in Li2BaP2O7 activated with Eu(2+) /Cu(+) are reported. Strong thermoluminescence, which is about two times greater than LiF-TLD 100 was observed in the Eu(2+) -activated sample. It also exhibited optically stimulated luminescence sensitivity of ~20% that of commercial Al2O3:C phosphor.

Luminescence studies of decomposition of ceric sulfate.

Literature results on the decomposition products of ceric sulfate are inconsistent. A group of researchers claim that ceric sulfate decomposed to ceric oxide without going through a cerous phase at any stage, while the results of the other group show that cerous sulfate is formed as an intermediate phase. Most of these studies used DTA/TGA, XRD and IR techniques.

Wet-chemical preparation of Ce3+-activated K2LaX5 (X = Cl, Br or I) phosphors.

There has been a renewed interest in Ce(3+) -activated halide phosphors due to applications as scintillation detectors, especially for positron emission tomography. For K(2) LaCl(5), the light yield increases and the energy resolution (FWHM) improves with increasing Ce(3+) doping. K(2) LaX(5) compounds are also important as laser hosts for the mid-IR range.