Author/Authors :
Jar، نويسنده , , V. and Havlلk، نويسنده , , L. and Bلrta، نويسنده , , J. and Mihَkovل، نويسنده , , E. and Nikl، نويسنده , , M.، نويسنده ,
Abstract :
Pure KLuS2 single crystals doped with divalent europium were synthesized in the form of crystalline hexagonal platelets. UV/Vis absorption and luminescence characteristics were measured in the broad temperature and concentration interval. The band edge of KLuS2 is found at 303 nm, Eu2+ 4f–5d excitation band at 390 nm and Eu2+ emission at 520 nm with submicrosecond decay time. No significant thermal quenching of the Eu2+ emission is observed up to 200 °C. Phenomenological modeling and delayed recombination decays measurement are employed to investigate the Eu2+ excited state dynamics. The application potential in white LEDs or X-ray phosphors is discussed.
