Wydział Chemii

Justyna Zeler

Joanna Cybińska

Eugeniusz Zych

2018

Journal of Luminescence

200

50-58

10.1016/j.jlumin.2018.04.008

Naukowa

Angielski

Artykuł

Photoluminescent properties of nano- and micro-crystalline LuPO4:Ce3+ sintered materials were investigated in the temperature range of 20–700 K. It was shown that the nano-powders may be converted into highly translucent layers with good mechanical stability by heat-treatment at 1000 °C. Processing at higher temperatures caused grains growth and formation of a network of voids resulting in an increase of light scattering. Luminescent properties were analyzed in the 20–700 K range of temperatures. Electron-phonon coupling decreased when grains became smaller. As a result, the Stokes shift was smaller in the nano-ceramics (1010 cm−1) than in micro-ceramics (∼1580 cm−1). Energies of the crystal field components of 2F5/2 and 2F7/2, Stokes shift and kinetics of Ce3+ luminescence in the nano- and micro-size material over the 20–700 K range of temperatures were determined. It was shown that LuPO4:Ce does not suffer from thermal quenching up to about 650 K. Nano-ceramics appeared even more resistant to thermal quenching than micro-ceramics showing no indication of decay time shortening up to 700 K.

Translucent ceramics, LuPO4, Ce3+, photoluminescence, Vibronic structure, Thermal quenching

http://doi.org/10.1016/j.jlumin.2018.04.008

http://www.elsevier.com