Luminescence and energy-transfer mechanism of a praseodymium material

Abstract

A praseodymium (Pr) material, [Pr(isonicotinic acid)2(H2O)4] n nNO3 (1), was synthesized through a solvothermal reaction and was characterized by single-crystal X-ray diffraction. It is characterized by a one-dimensional chain-like structure. The [Pr(isonicotinic acid)2(H2O)4] n n+ cationic chains and isolated nitrate (NO3 −) anions are interlinked by hydrogen (H)-bonding interactions, yielding a three-dimensional supramolecular network. Solid-state photoluminescence measurements revealed that it exhibits a yellow-light emission. The photoluminescence emission bands originate from the characteristic emission of the 4f electron intrashell transitions of 3 P 1 → 3 H 5 and 3 P 0 → 3 H 6 of the praseodymium ion (Pr3+). The energy-transfer mechanism is explained by the energy-level diagram of the praseodymium ion and the isonicotinic acid (C6H5NO2) ligand. The praseodymium material has remarkable Commission Internationale de l’Éclairage chromaticity coordinates of (0·4251, 0·4646). Therefore, it is a promising color converter for lighting and displays. It is found that isonicotinic acid is not an ideal ligand to excite Pr3+ ions, i.e. not a good “antenna”. The purity of the bulky sample was confirmed by PXRD. The FT-IR bands of the title complex were assigned. The title complex is thermally stable at about 90°C

Synthesis, Characterization, and DFT studies of Praseodymium (III) Octanoyl‐DL‐aminocarboxylate Complexes

“…In this work, we synthesized three different types of praseodymium(III) complexes and studied their optical absorption, luminescence, and liquid crystal properties. Praseodymium(III) complexes generally emit blue [11] and yellow [12] light; however, the praseodymium(III) complexes reported in this paper emit white light, indicating application potential in white light emitting materials. The structure and coordination number are crucial parameters in these complexes.…”