Luminescent Bi-containing Phosphate-Molybdate Glass-Ceramics

The procedure of preparation of luminescent glass-ceramics consisting of 37.09K
₂
O-31.79P
₂
O
₅
-25.43MoO
₃
-5.69Bi
₂
O
₃
glass and KBi
_0.95
Eu(MoO
₄
)
₂
was described. The results of powder X-ray diffraction, scanning electron microscopy, thermo-gravimetrical analysis and luminescence spectroscopy studies have been discussed from viewpoint of the studied materials application in white light emitting diodes. It was found that glass-ceramics consist mainly of amorphous phase with inclusion of potassium bismuth molybdate micro/nanocrystals. The glass transition temperatures were determined as 333, 340 and 327 °C for initial glass, Eu-doped glass and glass-ceramics studied, respectively. The initial glass reveals wide luminescence band that lies in 500 - 750 nm spectral range under excitation at 473 nm at room temperature. Europium-doped glass and glass-ceramics samples mainly reveal luminescence bands of f-f transitions in Eu
³⁺
ions. The broadening of Eu
³⁺
emission bands in glass-ceramic samples was ascribed to migration of some rare-earth ions from crystalline component into glass host.