Uncovering thermally activated purple-to-blue luminescence in co-modified MgAl-layered double hydroxide

Gevers, Bianca R.; Roduner, Emil; Leuteritz, Andreas; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)

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Uncovering thermally activated purple-to-blue luminescence in co-modified MgAl-layered double hydroxide

Gevers, Bianca R.; Roduner, Emil; Leuteritz, Andreas; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)

URI: http://hdl.handle.net/2263/101186

Date: 2024-04

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.

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