Preparation, photoluminescence and semiconductive band gap of a gadolinium compound

Abstract

A new compound [Gd(H₂O)₄(HIA)₂(NO₃)](2NO₃) (1; HIA is isonicotinic acid) is reported. The Gd³⁺ cation is coordinated by eight oxygen atoms and exhibit a square antiprismatic GdO₈ geometry. A three-dimensional (3-D) supramolecular framework is formed by hydrogen bond interactions. The photoluminescence absorption peak is ascribed to the ⁸S_7/2→⁶I_J, while the photoluminescence emission peaks are originated from the characteristic emission of the ⁶P_5/2→⁸S_7/2 and ⁶P_7/2→⁸S_7/2 transitions of Gd³⁺ ions. A solid-state UV/Vis diffuse reflectance spectrum reveals that it shows a wide optical band gap of 3.17 eV.

A new gadolinium compound is reported. It features a 3-D supramolecular framework formed by hydrogen bond interactions. The photoluminescence absorption peak is ascribed to the ⁸S_7/2→⁶I_J, while the emission is originated from the characteristic emission of the ⁶P_5/2→⁸S_7/2 and ⁶P_7/2→⁸S_7/2 transitions of the Gd³⁺ ion. It possesses a wide optical band gap of 3.17 eV.

Graphical Abstract

Keywords:

• Crystal
• gadolinium
• lanthanide
• photoluminescence
• band gap

Additional information

Funding

I gratefully acknowledge the financial support of the open foundation of the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (20180008).