scholarly journals Synthesis, structure, photophysical properties, and energy transfer mechanism of an erbium–mercury compound

2020 ◽  
Vol 44 (11-12) ◽  
pp. 727-732
Author(s):  
Wen-Tong Chen
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Hydrothermal Reaction ◽  
Isonicotinic Acid ◽  
Photophysical Properties ◽  
Transfer Mechanism ◽  
Mercury Compound ◽  
Energy Transfer Mechanism ◽  
Reflectance Measurement ◽  
Erbium Ions

A hydrothermal reaction leads to the formation of a novel erbium–mercury compound [Er(IA)3(H3O)(H2O)] n(0.5 nHg2I6) (1) (HIA = isonicotinic acid). The compound has been characterized by single-crystal X-ray diffraction. It is characteristic of a one-dimensional chain-like structure and a two-dimensional supramolecular layer. A solid-state photoluminescence experiment reveals that this compound displays upconversion green photoluminescence. The photoluminescence emission peaks can be attributed to the 4 G11/2 → 4 I15/2, 4 F7/2 → 4 I15/2, and 2 H11/2 → 4 I15/2 of the Er3+ ions. The energy transfer mechanism is consistent with the energy-level diagrams of the erbium ions and isonicotinic acid ligand. This compound possesses Commission Internationale de I'Éclairage chromaticity coordinates of 0.1755 and 0.5213. A solid-state diffuse reflectance measurement reveals that this compound features a narrow optical band gap of 1.97 eV.

scholarly journals Photophysical properties and energy transfer mechanism of a praseodymium compound with a two-dimensional layer

2020 ◽  
Vol 44 (5-6) ◽  
pp. 343-348
Author(s):  
Wen-Tong Chen
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Hydrothermal Reaction ◽  
Photophysical Properties ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Two Dimensional ◽  
Monoclinic System ◽  
Reflectance Measurement ◽  
Praseodymium Complex

A hydrothermal reaction results in the formation of a novel [Pr2(2,5-PA)2(2,5-HPA)2(H2O)4] n·2 nH2O complex (2,5-H2PA = 2,5-pyridinedicarboxylic acid). The complex is structurally characterized by single-crystal X-ray diffraction and crystallizes in the space group P21 of the monoclinic system with two formula units in one cell. This praseodymium complex is characterized by a two-dimensional layered structure. A solid-state photoluminescence experiment reveals that the praseodymium complex shows an emission in the red region. The complex has Commission Internationale de I’Éclairage chromaticity coordinates of 0.5495 and 0.4492. The photoluminescence emission bands could be assigned to the characteristic emission of the 4 f electron intrashell transition of the 3 P0 → 3 H5, 1 D2 → 3 H4, 3 P0 → 3 H6, 3 P0 → 3 F2, and 3 P1 → 3 F3 of the Pr3+ ions. The energy transfer mechanism is explained by the energy level diagrams of the praseodymium ions and the 2,5-H2PA ligand. A solid-state diffuse reflectance measurement shows that the complex possesses a wide optical band gap of 3.48 eV.

scholarly journals Photophysical Properties and Energy Transfer Mechanism in PFO/TiO2/MEH-PPV Nanocomposite Thin Films

2020 ◽  
Vol 49 (11) ◽  
pp. 2801-2809
Author(s):  
Sameer Albati ◽  
Mohammad Hafizuddin Hj. Jumali ◽  
Bandar Ali Al-Asbahi ◽  
Saif M.H. Qaid ◽  
Chi Chin Yap
Keyword(s):  
Thin Films ◽  
Energy Transfer ◽  
Photophysical Properties ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Nanocomposite Thin Films

scholarly journals Crystal Structure and Photophysical Properties of a Novel Dy-Hg Isonicotinic Acid Compound with One-Dimensional Chain-Like Cations

2020 ◽  
Vol 67 (4) ◽  
pp. 1111-1117
Author(s):  
Wen-Tong Chen
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Emission Band ◽  
Hydrothermal Reaction ◽  
Isonicotinic Acid ◽  
Photophysical Properties ◽  
Diffuse Reflectance Spectrum ◽  
Yellow Emission ◽  
Monoclinic System ◽  
One Dimensional

A novel Dy-Hg compound [Dy(HIA)3(H2O)2]2n · 2nHgCl4 · nHgCl5 · nH3O · 3nH2O (1; HIA = isonicotinic acid) was prepared through a hydrothermal reaction and characterized by X-ray diffraction. The compound crystallizes in the space group of C2/c of the monoclinic system. The crystal structure of compound 1 has one-dimensional (1-D) chain-like cations. A photoluminescence experiment with a solid-state sample revealed that this compound exhibits a yellow emission band at 575 nm and, this emission band shall come from the 4f electron 4F9/2 → 6H13/2 characteristic transfer of Dy3+ ions. The compound features CIE chromaticity coordinates of 0.5168 and 0.4824 in the yellow region. A UV-visible diffuse reflectance spectrum with a solid-state sample unveiled that this compound possesses a wide optical band gap of 3.39 eV.

scholarly journals A novel terbium–mercury compound: Preparation, structure, and properties

2020 ◽  
Vol 44 (7-8) ◽  
pp. 441-446
Author(s):  
Wen-Tong Chen
Keyword(s):  
Solid State ◽  
Diffuse Reflectance ◽  
Hydrothermal Reaction ◽  
Isonicotinic Acid ◽  
Energy Transfer Mechanism ◽  
X Ray Diffraction ◽  
Energy Level Scheme ◽  
Acid Complex ◽  
X Ray ◽  
Chromaticity Coordinates

Using a hydrothermal reaction, a novel 4f–5d isonicotinic acid complex {[Tb2(IA)6(H2O)4](Hg3Cl7)} n( nHgCl4)· nCl·4 nH3O (1, HIA = isonicotinic acid) was synthesized and it was characterized by single crystal X-ray diffraction technique. Compound 1 is characterized by a two-dimensional layer-like structure. The photoluminescence measurement using solid-state samples uncovered that it shows four emission peaks at 489, 546, 587, and 622 nm, of which the peak at 546 nm is the strongest. These peaks could be assigned to the 5 D4 → 7 F6, 5 D4 → 7 F5, 5 D4 → 7 F4, and 5 D4 → 7 F3 transitions of the Tb3+ ions, respectively. The energy transfer mechanism of the photoluminescence emission was described by means of the energy level scheme of the Tb3+ ions and the isonicotinic acid ligand. Compound 1 shows remarkable CIE (Commission Internationale de I’Éclairage) chromaticity coordinates of (0.3633, 0.5038) in the yellowish green region. Compound 1 possesses a wide semiconductor band gap of 2.97 eV, as unveiled by the solid-state UV-Vis diffuse reflectance experiment.

Photophysical properties and energy transfer mechanism of PFO/Fluorol 7GA hybrid thin films

2013 ◽  
Vol 142 ◽  
pp. 57-65 ◽  
Author(s):  
Bandar Ali Al-Asbahi ◽  
Mohammad Hafizuddin Haji Jumali ◽  
Chi Chin Yap ◽  
Moayad Husein Flaifel ◽  
Muhamad Mat Salleh
Keyword(s):  
Thin Films ◽  
Energy Transfer ◽  
Photophysical Properties ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Hybrid Thin Films
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