1
|
Mebarki L, Kahouadji B, Zoukel A, Benharrat L, Prakash J, Ouhenia S, Souici A, Delaey M, Guerbous L, Poelman D, Swart HC. Novel Orange-Emitting YPO 4:Sm 3+/Polymer Nanocomposite Phosphor Films for LED Applications. J Fluoresc 2024:10.1007/s10895-024-03915-2. [PMID: 39251551 DOI: 10.1007/s10895-024-03915-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 08/20/2024] [Indexed: 09/11/2024]
Abstract
A polymer based nanocomposite (NC) material embedded with highly luminescent nanopowders could be promising for replacing traditional luminescent materials from a technological point of view. In this study, we have successfully obtained YPO4: Sm3+ /Polymer nanocomposite phosphor films by embedding YPO4: Sm3+ luminescent nanoparticles (NPs) for orange-light emitting diode (LED) applications. These luminescent NPs were synthesized using the sol gel method in different polymer matrices i.e. polystyrene (PS) and poly (methyl methacrylate) (PMMA) by using direct solution mixing. The structural, morphological, and photoluminescence characteristics of the nano-phosphors and resulting NC films were examined and discussed. The emission spectra of YPO4: Sm3+ (x at.%) nano-phosphors under near-UV excitation at 404 nm were dominated by orange emission attributed to 6H5/2 → 4F7/2 (601 nm) luminescence of Sm3+ ions. The optimum doping concentration of activator Sm3+ in YPO4 matrix was found to be 5 at.%. When the doping concentration of Sm3+ was higher than 5 at.%, concentration quenching occurred. The incorporation of YPO4: Sm3+ NPs into polymer matrices indicated that the NCs retained the original luminescence properties of the luminescent NPs, although a decrease in their emission intensity was observed for the NC films, attributable to a polymer matrix effect, which dominated in PS matrix. The fluorescence decay times of NPs in the NC films were measured and compared to those of proper YPO4: Sm3+ nano-phosphors. A decrease in decay time in NC film was observed due the effective refractive index effect. Temperature-dependent photoluminescence (TDPL) of PMMA NC film was studied in 100-400 K range, investigating the thermal stability of the film. Additionally, CIE coordinates confirmed the red-orange light emission of the prepared phosphors and NC films. The obtained results indicate that the synthesized polymer-nanophosphor NC films are promising candidates for orange-LED applications.
Collapse
Affiliation(s)
- Lamine Mebarki
- Laboratory of Physical-Chemistry, University of Bejaia, 06000, Bejaia, Algeria
| | - Badis Kahouadji
- Department of Technology (El Kseur Campus), Laboratory of Physical-Chemistry, University of Bejaia, 06000, Bejaia, Algeria.
| | - Abdelhalim Zoukel
- Technical Platform of Physico-Chemical Analysis (PTAPC-Laghouat-CRAPC), Laghouat, Algeria
- Laboratory Physico-Chemistry of Materials, Technical Platform of Physico-Chemical Analysis (PTAPC-Laghouat-CRAPC), Laghouat University, Laghouat, Algeria
| | - Lyes Benharrat
- Research Center in Semiconductors Technology for Energy-CRTSE, 02, Bd. Dr. Frantz Fanon, B.P. 1407 Merveilles, 16038, Algiers, Algeria
| | - Jai Prakash
- Department of Chemistry, National Institute of Technology Hamirpur, (H.P.)-177005, Hamirpur, India
- Department of Physics, University of the Free State, Bloemfontein, ZA9300, South Africa
| | - Salim Ouhenia
- Laboratory of Physical-Chemistry, University of Bejaia, 06000, Bejaia, Algeria
| | - Abdelhafid Souici
- Laboratory of Physical-Chemistry, University of Bejaia, 06000, Bejaia, Algeria
| | - Maxime Delaey
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1 B-9000, Ghent, Belgium
| | - Lakhdar Guerbous
- Laser Department/ Nuclear Research Centre of Algiers (CRNA), 02, Boulevard Frantz Fanon, B.P. 399, 16000, Algiers, Algeria
| | - Dirk Poelman
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1 B-9000, Ghent, Belgium
| | - Hendrik C Swart
- Department of Physics, University of the Free State, Bloemfontein, ZA9300, South Africa
| |
Collapse
|
2
|
Saha S, Khamrui S, Biradha K. Light-Induced Antiferromagnetic to Ferromagnetic Transition in Halogen Substituted 1,4-Bis(imidazolyl)benzene Systems: An Effect of Spin-Orbit Coupling and π-Stacking in Enhanced Photomagnetism. J Am Chem Soc 2024. [PMID: 39231259 DOI: 10.1021/jacs.4c10757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2024]
Abstract
Employing the spin-orbit coupling effect by introducing halogen substituents is an excellent strategy to tune the magnetic behavior of organic or metal-organic materials. Light is an alternative tool to modulate the magnetic behavior of a material through a photoinduced electron transfer process, without changing its chemical identity. In this work, three halogen containing 1,4-bis(4,5-diphenyl-1H-imidazol-2-yl)benzene (F-BDPI, Cl-BDPI and Br-BDPI) systems have been chosen to exploit the role of halogen substituents on solid-state photoinduced phenomena. Through a comprehensive analysis involving various characterization techniques, including UV/vis diffuse reflectance, solid-state photoluminescence, and EPR measurements, it was found that the as-synthesized forms Cl-BDPI-IA and Br-BDPI-IA (IA denotes the hexahydrate form of Cl/Br-BDPI) exhibited fast photochromic response through the generation of photoinduced free radicals in the solid state. Moreover, the SQUID analysis revealed an antiferromagnetic to ferromagnetic transition in Cl-BDPI-IA through photoirradiation, which led to an increase in the magnetic moment value up to 38% at room temperature. This signifies the first occurrence of such a significant level of magnetization amplitude compared with previously reported metal-organic photomagnets. This investigation underscores the significance of halogen substitution in tailoring the magnetic properties of organic photomagnets, where strong halogen-π and π-π interactions facilitate the spin-orbit coupling effect in the solid state.
Collapse
Affiliation(s)
- Subhajit Saha
- Department of Chemistry Indian Institute of Technology, Kharagpur, Kharagpur, West Bengal 721302, India
| | - Sudipta Khamrui
- Department of Physics Indian Institute of Technology, Kharagpur, Kharagpur, West Bengal 721302, India
| | - Kumar Biradha
- Department of Chemistry Indian Institute of Technology, Kharagpur, Kharagpur, West Bengal 721302, India
| |
Collapse
|
3
|
Dubey N, Gupta S, Shelar SB, Barick KC, Chandra S. Maximizing Upconversion Luminescence of Co-Doped CaF₂:Yb, Er Nanoparticles at Low Laser Power for Efficient Cellular Imaging. Molecules 2024; 29:4177. [PMID: 39275024 DOI: 10.3390/molecules29174177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2024] [Revised: 08/29/2024] [Accepted: 09/01/2024] [Indexed: 09/16/2024] Open
Abstract
Upconversion nanoparticles (UCNPs) are well-reported for bioimaging. However, their applications are limited by low luminescence intensity. To enhance the intensity, often the UCNPs are coated with macromolecules or excited with high laser power, which is detrimental to their long-term biological applications. Herein, we report a novel approach to prepare co-doped CaF2:Yb3+ (20%), Er3+ with varying concentrations of Er (2%, 2.5%, 3%, and 5%) at ambient temperature with minimal surfactant and high-pressure homogenization. Strong luminescence and effective red emission of the UCNPs were seen even at low power and without functionalization. X-ray diffraction (XRD) of UCNPs revealed the formation of highly crystalline, single-phase cubic fluorite-type nanostructures, and transmission electron microscopy (TEM) showed co-doped UCNPs are of ~12 nm. The successful doping of Yb and Er was evident from TEM-energy dispersive X-ray analysis (TEM-EDAX) and X-ray photoelectron spectroscopy (XPS) studies. Photoluminescence studies of UCNPs revealed the effect of phonon coupling between host lattice (CaF2), sensitizer (Yb3+), and activator (Er3+). They exhibited tunable upconversion luminescence (UCL) under irradiation of near-infrared (NIR) light (980 nm) at low laser powers (0.28-0.7 W). The UCL properties increased until 3% doping of Er3+ ions, after which quenching of UCL was observed with higher Er3+ ion concentration, probably due to non-radiative energy transfer and cross-relaxation between Yb3+-Er3+ and Er3+-Er3+ ions. The decay studies aligned with the above observation and showed the dependence of UCL on Er3+ concentration. Further, the UCNPs exhibited strong red emission under irradiation of 980 nm light and retained their red luminescence upon internalization into cancer cell lines, as evident from confocal microscopic imaging. The present study demonstrated an effective approach to designing UCNPs with tunable luminescence properties and their capability for cellular imaging under low laser power.
Collapse
Affiliation(s)
- Neha Dubey
- Department of Chemistry, Sunandan Divatia School of Science, SVKM's NMIMS (Deemed To-Be) University, Mumbai 400056, India
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Sonali Gupta
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Sandeep B Shelar
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - K C Barick
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Sudeshna Chandra
- Hanse-Wissenschaftskolleg-Institute for Advanced Study (HWK), Lehmkuhlenbusch 4, 27753 Delmenhorst, Germany
| |
Collapse
|
4
|
Zidani J, Alaoui IH, Zannen M, Birks E, Chchiyai Z, Majdoub M, Manoun B, El Marssi M, Lahmar A. On the Lanthanide Effect on Functional Properties of 0.94Na 0.5Bi 0.5TiO 3-0.06BaTiO 3 Ceramic. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1783. [PMID: 38673140 PMCID: PMC11050839 DOI: 10.3390/ma17081783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024]
Abstract
The beneficial effects of lanthanide incorporation into 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 (BNT-BT) matrix on its functional properties were investigated. The conventional solid-state method was used for synthesizing samples. The structural refinement revealed that all samples crystallized in R3c rhombohedral symmetry. Raman spectroscopy study was carried out using green laser excitation and revealed that no clear perceptible variation in frequency is observed. Dielectric measurements unveiled that the introduction of rare earth obstructed the depolarization temperature promoted in BNT-BT, the diffusive phase transition decreasing with increasing lanthanide size. Only dysprosium addition showed comparable diffusion constant and dielectric behavior as the unmodified composition. Further, the comparison of the obtained ferroelectric hysteresis and strain-electric field loops revealed that only Dy-phase exhibited interesting properties comparing parent composition. In addition, the incorporation of lanthanides Ln3+ into the BNT-BT matrix led to the development of luminescence characteristics in the visible and near infrared regions, depending on the excitation wavelengths. The simultaneous occurrence of photoluminescence and ferroelectric/piezoelectric properties opens up possibilities for BNT-BT-Ln to exhibit multifunctionality in a wide range of applications.
Collapse
Affiliation(s)
- Jacem Zidani
- Laboratory of Physics of Condensed Matter (LPMC), University of Picardie Jules Verne, Scientific, Pole, 33 rue Saint-Leu, 80039 Amiens, France; (J.Z.); (I.H.A.); (M.E.M.)
- Laboratory of Interfaces and Advanced Materials (LIMA), Faculty of Sciences of Monastir, University of Monastir, Bd. of the Environment, Monastir 5019, Tunisia; (M.Z.); (M.M.)
| | - Ilham Hamdi Alaoui
- Laboratory of Physics of Condensed Matter (LPMC), University of Picardie Jules Verne, Scientific, Pole, 33 rue Saint-Leu, 80039 Amiens, France; (J.Z.); (I.H.A.); (M.E.M.)
| | - Moneim Zannen
- Laboratory of Interfaces and Advanced Materials (LIMA), Faculty of Sciences of Monastir, University of Monastir, Bd. of the Environment, Monastir 5019, Tunisia; (M.Z.); (M.M.)
| | - Eriks Birks
- Institute of Solid-State Physics, University of Latvia, LV-1586 Riga, Latvia;
| | - Zakaria Chchiyai
- Laboratory of Inorganic Materials for Sustainable Energy Technologies (LIMSET), Mohammed VI Polytechnic University (UM6P), Benguerir 43150, Morocco;
| | - Mustapha Majdoub
- Laboratory of Interfaces and Advanced Materials (LIMA), Faculty of Sciences of Monastir, University of Monastir, Bd. of the Environment, Monastir 5019, Tunisia; (M.Z.); (M.M.)
| | - Bouchaib Manoun
- FST, Rayonnement-Matière et Instrumentation, S3M, Hassan First University of Settat, Settat 26000, Morocco;
- Materials Science, Energy, and Nano-Engineering Department, University Mohammed VI Polytechnic, Ben Guerir 43150, Morocco
| | - Mimoun El Marssi
- Laboratory of Physics of Condensed Matter (LPMC), University of Picardie Jules Verne, Scientific, Pole, 33 rue Saint-Leu, 80039 Amiens, France; (J.Z.); (I.H.A.); (M.E.M.)
| | - Abdelilah Lahmar
- Laboratory of Physics of Condensed Matter (LPMC), University of Picardie Jules Verne, Scientific, Pole, 33 rue Saint-Leu, 80039 Amiens, France; (J.Z.); (I.H.A.); (M.E.M.)
| |
Collapse
|
5
|
Hajira S, Vijitha JS, Dhoble SJ, Raju BDP, Reddy BS. Optical analysis of RE 3+ (RE = Eu,Tb):MgLa 2 V 2 O 9 nano-phosphors. LUMINESCENCE 2024; 39:e4612. [PMID: 37927204 DOI: 10.1002/bio.4612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/04/2023] [Accepted: 10/09/2023] [Indexed: 11/07/2023]
Abstract
Red and green rare-earth ion (RE3+ ) (RE = Eu, Tb):MgLa2 V2 O9 micro-powder phosphors were produced utilizing a standard solid-state chemical process. The X-ray diffraction examination performed on the phosphors showed that they were crystalline and had a monoclinic structure. The particles grouped together, as shown in the scanning electron microscopy (SEM) images. Powder phosphors were examined using a variety of spectroscopic techniques, including photoluminescence (PL), Fourier-transform infrared, and energy dispersive X-ray spectroscopy. Brilliant red emission at 615 nm (5 D0 → 7 F2 ) having an excitation wavelength (λexci ) of 396 nm (7 F0 → 5 L6 ) and green emission at 545 nm (5 D4 → 7 F5 ) having an λexci = 316 nm (5 D4 → 7 F2 ) have both been seen in the emission spectra of Tb3+ :MgLa2 V2 O9 nano-phosphors. The emission mechanism that is raised in Eu3+ :MgLa2 V2 O9 and Tb3+ :MgLa2 V2 O9 powder phosphors has been explained in an energy level diagram.
Collapse
Affiliation(s)
- Shaik Hajira
- Department of Physics, Government College for Men (A), Kadapa, India
| | | | | | | | | |
Collapse
|
6
|
Cheng YH, Kuo CT, Lian BY. Chameleon-Inspired Colorimetric Sensors for Real-Time Detections with Humidity. MICROMACHINES 2023; 14:2254. [PMID: 38138423 PMCID: PMC10745728 DOI: 10.3390/mi14122254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 12/15/2023] [Accepted: 12/16/2023] [Indexed: 12/24/2023]
Abstract
In recent decades, vapor sensors have gained substantial attention for their crucial roles in environmental monitoring and pharmaceutical applications. Herein, we introduce a chameleon-inspired colorimetric (CIC) sensor, detailing its design, fabrication, and versatile applications. The sensor seamlessly combines a PEDOT:PSS vapor sensor with a colorimetric display, using thermochromic liquid crystal (TLC). We further explore the electrical characteristics of the CIC sensor when doped with ethylene glycol (EG) and polyvinyl alcohol (PVA). Comparative analyses of resistance change rates for different weight ratios of EG and PVA provide insights into fine-tuning the sensor's responsiveness to varying humidity levels. The CIC sensor's proficiency in measuring ambient humidity is investigated under a voltage input as small as 2.6 V, capturing resistance change rates and colorimetric shifts at relative humidity (RH) levels ranging from 20% to 90%. Notably, the sensor exhibits distinct resistance sensitivities of 9.7 mΩ (0.02% ∆R/R0)/%RH, 0.5 Ω (0.86% ∆R/R0)/%RH, and 5.7 Ω (9.68% ∆R/R0)/%RH at RH 20% to 30%, RH 30% to 80%, and RH 80% to 90%, respectively. Additionally, a linear temperature change is observed with a sensitivity of -0.04 °C/%RH. The sensor also demonstrates a colorimetric temperature sensitivity of -82,036 K/%RH at RH 20% to 30% and -514 K/%RH at RH 30% to 90%, per captured image. Furthermore, real-time measurements of ethanol vapor with varying concentrations showcase the sensor's applicability in gas sensing applications. Overall, we present a comprehensive exploration of the CIC sensor, emphasizing its design flexibility, electrical characteristics, and diverse sensing capabilities. The sensor's potential applications extend to real-time environmental monitoring, highlighting its promising role in various gas sensing fields.
Collapse
Affiliation(s)
- Yu-Hsuan Cheng
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;
| | - Ching-Te Kuo
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;
| | - Bo-Yao Lian
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;
| |
Collapse
|
7
|
Sharma CP, Vyas A, Pandey P, Gupta S, Vats RP, Jaiswal SP, Bhatt MLB, Sachdeva M, Goel A. A new class of teraryl-based AIEgen for highly selective imaging of intracellular lipid droplets and its detection in advanced-stage human cervical cancer tissues. J Mater Chem B 2023; 11:9922-9932. [PMID: 37840367 DOI: 10.1039/d3tb01764h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Lipid droplets (LDs) have drawn much attention in recent years. They serve as the energy reservoir of cells and also play an important role in numerous physiological processes. Furthermore, LDs are found to be associated with several pathological conditions, including cancer and diabetes mellitus. Herein, we report a new class of teraryl-based donor-acceptor-appended aggregation-induced emission luminogen (AIEgen), 6a, for selective staining of intracellular LDs in in vitro live 3T3-L1 preadipocytes and the HeLa cancer cell line. In addition, AIEgen 6a was found to be capable of staining and quantifying the LD accumulation in the tissue sections of advanced-stage human cervical cancer patients. Unlike commercial LD staining dyes Nile Red, BODIPY and LipidTOX, AIEgen 6a showed a high Stokes shift (195 nm), a good fluorescence lifetime decay of 12.7 ns, and LD staining persisting for nearly two weeks.
Collapse
Affiliation(s)
- Chandra Prakash Sharma
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
| | - Akanksha Vyas
- Division of Endocrinology CSIR-Central Drug Research Institute, Lucknow, 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Priyanka Pandey
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
| | - Shashwat Gupta
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Ravi Prakash Vats
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Sakshi Priya Jaiswal
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
| | | | - Monika Sachdeva
- Division of Endocrinology CSIR-Central Drug Research Institute, Lucknow, 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Atul Goel
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| |
Collapse
|
8
|
Rashamuse TJ, Coyanis EM, Erasmus R, Magwa NP. Novel Fluorescent Tetrahedral Zinc (II) Complexes Derived from 4-Phenyl-1-octyl-1 H-imidazole Fused with Aryl-9 H-Carbazole and Triarylamine Donor Units: Synthesis, Crystal Structures, and Photophysical Properties. Int J Mol Sci 2023; 24:12260. [PMID: 37569639 PMCID: PMC10418610 DOI: 10.3390/ijms241512260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/27/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
We present here the design, synthesis, and photophysical properties of two novel fluorescent zinc (II) complexes, ZnCl2(ImL1)2 and ZnCl2(ImL2)2, containing 4-(1-octyl-1H-imidazol-4-yl)-N,N-diphenyl-[1,1-biphenyl]-4-yl)-4-amine ImL1 and 9-(4-(1-octyl-1H-imidazol-4-yl)-[1,1-biphenyl]-4-yl)-9H-carbazole ImL2 ligands. The newly synthesized free ligands and their zinc (II) complexes were characterized using several spectroscopic techniques; their structures were identified by single-crystal X-ray diffraction; and their photophysical properties have been studied in the context of their chemical structure. The ZnCl2(ImL1)2 and ZnCl2(ImL2)2 complexes showed good thermal stability at 341 °C and 365 °C, respectively. Photophysical properties, including UV-Vis absorption spectra in ethanol solution and photoluminescence (PL) in both solid state and ethanol solution, were determined. UV-Vis adsorption data indicated that both free ligands had similar UV-Vis absorption properties, while their Zn (II) complexes had distinctive absorption characteristics. The fluorescence spectra show that both ligands and their corresponding Zn (II) complexes emit violet to cyan luminescence in the solid state at room temperature, while in ethanol solution at the same temperature, they exhibit efficient photoluminescence properties in the UV-A emission spectral region. Because of these photophysical properties, the synthesized ligands and their cognate Zn (II) complexes can be used as scaffolds for the potential development of optoelectronic materials.
Collapse
Affiliation(s)
- Thompho Jason Rashamuse
- Nanotechnology Innovation Centre, Health Platform, Advanced Materials Division, Mintek, Private Bag X3015, Randburg 2125, South Africa;
| | - Elena Mabel Coyanis
- Nanotechnology Innovation Centre, Health Platform, Advanced Materials Division, Mintek, Private Bag X3015, Randburg 2125, South Africa;
| | - Rudolph Erasmus
- Materials for Energy Research Group, Material Physics Research Institute, School of Physics, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South Africa;
| | - Nomampondo Penelope Magwa
- Department of Chemistry, University of South Africa, Private Bag X6, Florida, Roodepoort 1710, South Africa;
| |
Collapse
|