Abstract:
Thermally activated blue-to-purple luminescence of Co-modified
nano-sandrose MgAl-layered double hydroxides (LDHs) is concentration
dependent, occurring only for MgCoAl-LDH with a molar
metal cation concentration of 15% Co. Temperature sweep luminescence
spectroscopy between 83 K and 298 K shows that the
luminescence is strongest at room temperature, increasing with an
activation energy of 1 kJ mol−1 between these temperatures. The
luminescence occurs in a broad, but fine-structured band below
the conduction band (CB) edge at 3.0 eV after excitation at 5.0 eV.
