Synthesis and luminescence of Cr(III)-doped aluminum oxide/molybdate composites

The conditions of synthesis and luminescence characteristics of composites Al
₂
O
₃
:Cr
³⁺
/NaAl(MoO
₄
)
₂
:Cr
³⁺
obtained from molybdate high-temperature solutions have been studied. The influence of the impurity Cr
³⁺
ions on crystallization regions in the molten system Na-Al-Mo-O has been detected as a key factor of composite formation. The luminescence emission spectra of the composite exhibit two narrow lines at 692 nm (Al
₂
O
₃
:Cr
³⁺
) and 740.5 nm (NaAl(MoO
₄
)
₂
:Cr
³⁺
), which indicates that both components of the composite are doped with chromium.