Luminescence and energy-transfer mechanism of a praseodymium material. Issue 4 (28th June 2019)

• Record Type: Journal Article
• Authors: Liu, Qian; Chen, Wen-Tong; Luo, Hui; Kuang, Han-Mao
• Is Part Of: Emerging materials research. Volume 8:Issue 4(2019)
• Page Start: 1
• Page End: 6
• Publication Date: 2019-06-28
• Subjects: crystallography -- molecular structure -- synthesis; Materials -- Periodicals; 620.11
• DOI: 10.1680/jemmr.19.00014
• Languages: English
• ISSNs: 2046-0147

Abstract

Abstract : A praseodymium (Pr) material, [Pr(isonicotinic acid)2 (H2 O)4 ] n n NO3 (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 (H2 O)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 4 f electron intrashell transitions of 3 P 1 → 3 H 5 and 3 P 0 → 3 H 6 of the praseodymium ion (Pr 3+ ). The energy-transfer mechanism is explained by the energy-level diagram of the praseodymium ion and the isonicotinic acid (C6 H5 NO2 ) 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 Pr 3+ 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