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Li H, Wang T, Han J, Xu Y, Kang X, Li X, Zhu M. Fluorescence resonance energy transfer in atomically precise metal nanoclusters by cocrystallization-induced spatial confinement. Nat Commun 2024; 15:5351. [PMID: 38914548 PMCID: PMC11196639 DOI: 10.1038/s41467-024-49735-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Accepted: 06/17/2024] [Indexed: 06/26/2024] Open
Abstract
Understanding the fluorescence resonance energy transfer (FRET) of metal nanoparticles at the atomic level has long been a challenge due to the lack of accurate systems with definite distance and orientation of molecules. Here we present the realization of achieving FRET between two atomically precise copper nanoclusters through cocrystallization-induced spatial confinement. In this study, we demonstrate the establishment of FRET in a cocrystallized Cu8(p-MBT)8(PPh3)4@Cu10(p-MBT)10(PPh3)4 system by exploiting the overlapping spectra between the excitation of the Cu10(p-MBT)10(PPh3)4 cluster and the emission of the Cu8(p-MBT)8(PPh3)4 cluster, combined with accurate control over the confined space between the two nanoclusters. Density functional theory is employed to provide deeper insights into the role of the distance and dipole orientations of molecules to illustrate the FRET procedure between two cluster molecules at the electronic structure level.
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Affiliation(s)
- Hao Li
- Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, 230601, Hefei, China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, 230601, Hefei, China
- Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, 230601, Hefei, China
- School of Materials and Chemical Engineering, Anhui Jianzhu University, 230601, Hefei, China
| | - Tian Wang
- Department of Chemistry, University of Washington, Seattle, WA, 98195-1653, USA
| | - Jiaojiao Han
- Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, 230601, Hefei, China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, 230601, Hefei, China
- Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, 230601, Hefei, China
| | - Ying Xu
- Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, 230601, Hefei, China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, 230601, Hefei, China
- Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, 230601, Hefei, China
| | - Xi Kang
- Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, 230601, Hefei, China.
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, 230601, Hefei, China.
- Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, 230601, Hefei, China.
| | - Xiaosong Li
- Department of Chemistry, University of Washington, Seattle, WA, 98195-1653, USA.
| | - Manzhou Zhu
- Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, 230601, Hefei, China.
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, 230601, Hefei, China.
- Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, 230601, Hefei, China.
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2
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Bhattacharjee S, Seth D. Unraveling the Photoluminescence Properties of a Boron Nitride Nanosheet Dispersed in Different Solvents and Its Application to Generate White Light. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:772-787. [PMID: 38153231 DOI: 10.1021/acs.langmuir.3c02968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Hexagonal boron nitride (h-BN) is an influential 2D nanomaterial; however, its practical optoelectronic applications rely primarily on controlling the structural defects. The photoluminescence depends explicitly on the developed vacancies and substitutional defects. The present work utilizes the concept of facile liquid-phase exfoliation of hexagonal (h) boron nitride (BN) powder in common organic solvents and cosolvent mixtures to obtain a layered boron nitride nanosheet (BNNS). Although the literature concerning the layered structure of BNNS obtained by different methods is substantial, what is lacking is a detailed photoluminescence study of the layered structure obtained by changing the solvent and cosolvent mixtures, and here lies the novelty of our work. The obtained layered structure was subjected to a detailed photoluminescence study by varying the temperature. We tried to correlate how the defects originating upon changing the solvent and cosolvent affected the photoluminescence of the layered BNNS. The obtained layered structure is suitably supported by optical and electron microscopy images. High-resolution transmission electron microscopy confirm the presence of a few layers, and X-ray photoelectron spectroscopy studies give an idea of the atomic composition of the obtained BNNS. The photoluminescence properties of the obtained BNNS in water were modulated by the addition of two different classes of block copolymers, e.g., Pluronic (F-68, P-407, and P-123) and Tetronic (T-904, T-908, and T-90R4) copolymers. As an application, we were successful in constructing a nanocomposite material made up of a BNNS-copolymer-organic fluorophore to check the possibilities of generating white light.
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Affiliation(s)
- Sanyukta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801103, Bihar, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801103, Bihar, India
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3
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Madonia A, Minervini G, Terracina A, Pramanik A, Martorana V, Sciortino A, Carbonaro CM, Olla C, Sibillano T, Giannini C, Fanizza E, Curri ML, Panniello A, Messina F, Striccoli M. Dye-Derived Red-Emitting Carbon Dots for Lasing and Solid-State Lighting. ACS NANO 2023; 17:21274-21286. [PMID: 37870465 PMCID: PMC10655242 DOI: 10.1021/acsnano.3c05566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 10/24/2023]
Abstract
Carbon dots are carbon-based nanoparticles renowned for their intense light-emitting capabilities covering the whole visible light range. Achieving carbon dots emitting in the red region with high efficiency is extremely relevant due to their huge potential in biological applications and in optoelectronics. Currently, photoluminescence in such an energy interval is often associated with polyheterocyclic molecular domains forming during the synthesis that, however, present low emission efficiency and issues in controlling the optical features. Here, we overcome these problems by solvothermally synthesizing carbon dots starting from Neutral Red, a common red-emitting dye, as a molecular precursor. As a result of the synthesis, such molecular fluorophore is incorporated into a carbonaceous core while retaining its original optical properties. The obtained nanoparticles are highly luminescent in the red region, with a quantum yield comparable to that of the starting dye. Most importantly, the nanoparticle carbogenic matrix protects the Neutral Red molecules from photobleaching under ultraviolet excitation while preventing aggregation-induced quenching, thus allowing solid-state emission. These advantages have been exploited to develop a fluorescence-based color conversion layer by fabricating polymer-based highly concentrated solid-state carbon dot nanocomposites. Finally, the dye-based carbon dots demonstrate both stable Fabry-Perot lasing and efficient random lasing emission in the red region.
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Affiliation(s)
- Antonino Madonia
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
| | - Gianluca Minervini
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
- Department
of Electrical and Information Engineering, Polytechnic of Bari, Bari, 70126, Italy
| | - Angela Terracina
- Dipartimento
di Fisica e Chimica “Emilio Segrè”, Università degli Studi di Palermo, Palermo 90123, Italy
| | - Ashim Pramanik
- Dipartimento
di Fisica e Chimica “Emilio Segrè”, Università degli Studi di Palermo, Palermo 90123, Italy
| | - Vincenzo Martorana
- Institute
of Biophysics Palermo Division, Italian
National Research Council, Palermo 90146, Italy
| | - Alice Sciortino
- Dipartimento
di Fisica e Chimica “Emilio Segrè”, Università degli Studi di Palermo, Palermo 90123, Italy
- ATeN
Center, Università degli Studi di
Palermo, Palermo 90123, Italy
| | | | - Chiara Olla
- Department
of Physics, University of Cagliari, Monserrato 09042, Italy
| | - Teresa Sibillano
- CNR-IC
Institute of Crystallography, Italian National
Research Council, Bari 70122, Italy
| | - Cinzia Giannini
- CNR-IC
Institute of Crystallography, Italian National
Research Council, Bari 70122, Italy
| | - Elisabetta Fanizza
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
- Chemistry
Department, University of Bari “Aldo
Moro”, Bari 70126, Italy
| | - Maria L. Curri
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
- Chemistry
Department, University of Bari “Aldo
Moro”, Bari 70126, Italy
| | - Annamaria Panniello
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
| | - Fabrizio Messina
- Dipartimento
di Fisica e Chimica “Emilio Segrè”, Università degli Studi di Palermo, Palermo 90123, Italy
- ATeN
Center, Università degli Studi di
Palermo, Palermo 90123, Italy
| | - Marinella Striccoli
- CNR-IPCF
Bari Division, Italian National Research
Council, Bari, 70126, Italy
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4
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Nabihah Mohd Yusof Chan N, Idris A, Hazrin Zainal Abidin Z, Anuar Tajuddin H. White light emission from coumarin and rhodamine derivatives based on RGB multicomponent system. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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5
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Witzmann A, Gordon CK, Howarth J, Unsworth S, Rossi A, Hardy J, Price MB, Davis NJLK. Luminescent light diffuser for diffuse lighting applications. LUMINESCENCE 2023; 38:47-55. [PMID: 36433880 PMCID: PMC10108133 DOI: 10.1002/bio.4416] [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: 08/02/2022] [Revised: 11/07/2022] [Accepted: 11/21/2022] [Indexed: 11/28/2022]
Abstract
The lighting industry currently accounts for a significant proportion of all energy demand. Luminescent white lighting is often impure, inefficient, expensive, and detrimentally emits as a point source, meaning the light is emitted from a focused point. A luminescent light diffuser offers the potential to create a spatially broad lighting fixture. We developed a luminescent light diffuser consisting of three commercially available luminescent dye species (rhodamine 6G, fluorescein, 7-diethylamino-4-methylcoumarin) dispersed within a polymer matrix (polyvinyl alcohol), or commercial paint, and coated on a planar waveguide. A Light-emitting diode (LED) (385 nm) is directed into the waveguide which excites the luminescent species, coating the panel, creating a device that emits spatially broad pure white light. As the emission depends on escape cone emission from the waveguide, the device's emission was found to depend highly on the coating film quality and components. We present two systems: a small 40 mm × 40 mm prototype, made using standard water-soluble polymer (polyvinyl alcohol), to study the underlying operational principles, and a 100 mm × 100 mm device with optimized efficiency fabricated with a clear commercial paint. By doping the polymer matrix with scattering silica microparticles we achieved a maximum photon outcoupling efficiency of 78%, whilst maintaining colour purity with an increased device size of more than 300 times (compared with the input LED). This work shows that it is possible to construct an inexpensive and spatially broad lighting source, whilst maintaining colour purity at a low cost.
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Affiliation(s)
- Amy Witzmann
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Calum K Gordon
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Jesse Howarth
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Sophie Unsworth
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Aurélien Rossi
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Jake Hardy
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Michael B Price
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
| | - Nathaniel J L K Davis
- School of Chemical and Physical Sciences, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The Dodd-Walls Centre for Photonic and Quantum Technologies, Victoria University of Wellington, Wellington, New Zealand
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6
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Demonstration of intracellular real-time molecular quantification via FRET-enhanced optical microcavity. Nat Commun 2022; 13:6685. [PMID: 36335126 PMCID: PMC9637138 DOI: 10.1038/s41467-022-34547-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 10/24/2022] [Indexed: 11/08/2022] Open
Abstract
Single cell analysis is crucial for elucidating cellular diversity and heterogeneity as well as for medical diagnostics operating at the ultimate detection limit. Although superbly sensitive biosensors have been developed using the strongly enhanced evanescent fields provided by optical microcavities, real-time quantification of intracellular molecules remains challenging due to the extreme low quantity and limitations of the current techniques. Here, we introduce an active-mode optical microcavity sensing stage with enhanced sensitivity that operates via Förster resonant energy transferring (FRET) mechanism. The mutual effects of optical microcavity and FRET greatly enhances the sensing performance by four orders of magnitude compared to pure Whispering gallery mode (WGM) microcavity sensing system. We demonstrate distinct sensing mechanism of FRET-WGM from pure WGM. Predicted lasing wavelengths of both donor and acceptor by theoretical calculations are in perfect agreement with the experimental data. The proposed sensor enables quantitative molecular analysis at single cell resolution, and real-time monitoring of intracellular molecules over extended periods while maintaining the cell viability. By achieving high sensitivity at single cell level, our approach provides a path toward FRET-enhanced real-time quantitative analysis of intracellular molecules.
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7
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Mondal K, Pramanik A, Mondal T, Panja SS, Sarkar R, Kumbhakar P. Self-Assembly of Solvent-Stabilized Au Nanocluster as Efficient Förster Resonance Energy-Transfer Initiator for White Light Generation. J Phys Chem Lett 2022; 13:3079-3088. [PMID: 35353525 DOI: 10.1021/acs.jpclett.1c04228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Aggregation-induced enhancement (AIE) in the photoluminescence quantum yield (PLQY) from 12.5 to 51% in the N,N-dimethylformamide (DMF)-stabilized Au nanocluster (AuNC) system is reported here. The self-assembling of AuNC has been achieved via hydrogen bonding interaction, which is further utilized in designing the AuNC_DCM system for realizing a Förster resonance energy transfer (FRET)-based white LED (WLED), having CIE coordinates of (0.35, 0.29). The solution-processed fabrication strategy used, has given us the liberty to optimize its components for optimal full-spectrum light output. The CIE coordinates of the designed WLED have been improved further to (0.33, 0.32), with a high color rendering index of 93 and correlated color temperature of 5620 K by incorporating a green emitter, namely nitrogen-doped graphene quantum dots (NGQD), in the AuNC_DCM system. The excellent spectral quality of the as-designed WLED and the repeatability of the proposed fabrication method will make the developed AuNCs_DCM FRET conjugate useful in practical photonic applications.
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Affiliation(s)
- Koushik Mondal
- Nanoscience Laboratory, Dept. of Physics, National Institute of Technology Durgapur, 713209 West Bengal, India
| | - Ashim Pramanik
- Nanoscience Laboratory, Dept. of Physics, National Institute of Technology Durgapur, 713209 West Bengal, India
| | - Tapashree Mondal
- Dept. of Chemistry, National Institute of Technology Durgapur, 713209 West Bengal, India
| | - Sujit Sankar Panja
- Dept. of Chemistry, National Institute of Technology Durgapur, 713209 West Bengal, India
| | - Rajat Sarkar
- Nanoscience Laboratory, Dept. of Physics, National Institute of Technology Durgapur, 713209 West Bengal, India
| | - Pathik Kumbhakar
- Nanoscience Laboratory, Dept. of Physics, National Institute of Technology Durgapur, 713209 West Bengal, India
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8
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Drummer MC, Singh V, Gupta N, Gesiorski JL, Weerasooriya RB, Glusac KD. Photophysics of nanographenes: from polycyclic aromatic hydrocarbons to graphene nanoribbons. PHOTOSYNTHESIS RESEARCH 2022; 151:163-184. [PMID: 33963981 DOI: 10.1007/s11120-021-00838-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 04/22/2021] [Indexed: 06/12/2023]
Abstract
Graphene quantum dots (GQDs) and nanoribbons (GNRs) are classes of nanographene molecules that exhibit highly tunable photophysical properties. There have been great strides in recent years to advance our understanding of nanographene photophysics and develop their use in light-harvesting systems, such as artificial photosynthesis. Here, we review the latest studies of GQDs and GNRs which have shed new light onto their photophysical underpinnings through computational and advanced spectroscopic techniques. We discuss how the size, symmetry, and shape of nanographenes influence their molecular orbital structures and, consequentially, their spectroscopic signatures. The scope of this review is to comprehensively lay out the general photophysics of nanographenes starting with benzene and building up to larger polycyclic aromatic hydrocarbons, GQDs, and GNRs. We also explore a collection of publications from recent years that build upon the current understanding of nanographene photophysics and their potential application in light-driven processes from display, lasing, and sensing technology to photocatalytic water splitting.
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Affiliation(s)
- Matthew C Drummer
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA
| | - Varun Singh
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA
| | - Nikita Gupta
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA
| | - Jonathan L Gesiorski
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA
| | - Ravindra B Weerasooriya
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA
| | - Ksenija D Glusac
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, 60607, USA.
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 Cass Avenue, Lemont, IL, 60439, USA.
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9
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Al-Asbahi BA, Qaid SMH, Ghaithan HM, Aldwayyan AS. Triplet Energy Transfer Mechanism of Ternary Organic Hybrid Thin Films of PFO/MEH-PPV/CsPbBr 3 Perovskite Quantum Dots. NANOMATERIALS 2020; 10:nano10112094. [PMID: 33105689 PMCID: PMC7690439 DOI: 10.3390/nano10112094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/19/2020] [Accepted: 10/21/2020] [Indexed: 11/16/2022]
Abstract
The triplet energy transfer mechanism of novel poly(9,9-di-n-octylflourenyl-2,7-diyl) (PFO)/poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV)/CsPbBr3 perovskite quantum dot (PQD) hybrid thin films was comprehensively investigated. The concentrations of PFO and MEH-PPV in all the specimens were fixed, while the PQD content was varied with various weight ratios and premixed by a solution blending method before it was spin-coated onto glass substrates. The triplet non-radiative Förster resonance energy transfers (FRETs) in the PFO/MEH-PPV/PQDs ternary blend, the dual FRET from PFO to both PQDs and MEH-PPV, and the secondary FRET from PQDs to MEH-PPV were observed. The values of the Förster radius (Ro) of FRET from PFO to MEH-PPV in the presence of various PQD contents (Case I) increased from 92.3 to 104.7 Å, and they decreased gradually from 68.0 to 39.5 Å for FRET from PFO to PQDs in the presence of MEH-PPV (Case II). These Ro values in both cases confirmed the dominance of FRET in ternary hybrid thin films. Upon increasing the PQD content, the distance between the donor and acceptor molecules (RDA) and the conjugation length (Aπ) in both cases gradually decreased. The small values of Ro, RDA, and Aπ with a decrease in the energy transfer lifetime (τET) due to an increase in the PQD contents in both Cases I and II confirmed the efficient FRET in the hybrid. To prevent intermolecular transfer in PFO, the concentrations of MEH-PPV (Case I) and PQDs (Case II) should be decreased to a range of 0.57-0.39 mM and increased in the range of 1.42-7.25 mM.
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Affiliation(s)
- Bandar Ali Al-Asbahi
- Department of Physics & Astronomy, College of Science King Saud University, Riyadh 11451, Saudi Arabia; (S.M.H.Q.); (H.M.G.); (A.S.A.)
- Department of Physics, Faculty of Science, Sana’a University, Sana’a P.O. Box 12544, Yemen
- Correspondence:
| | - Saif M. H. Qaid
- Department of Physics & Astronomy, College of Science King Saud University, Riyadh 11451, Saudi Arabia; (S.M.H.Q.); (H.M.G.); (A.S.A.)
- Department of Physics, Faculty of Science, Ibb University, Ibb P.O. Box 70270, Yemen
| | - Hamid M. Ghaithan
- Department of Physics & Astronomy, College of Science King Saud University, Riyadh 11451, Saudi Arabia; (S.M.H.Q.); (H.M.G.); (A.S.A.)
| | - Abdullah S. Aldwayyan
- Department of Physics & Astronomy, College of Science King Saud University, Riyadh 11451, Saudi Arabia; (S.M.H.Q.); (H.M.G.); (A.S.A.)
- King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
- K.A.CARE Energy Research and Innovation Center at Riyadh, P.O. Box 2022, Saudi Arabia
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10
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Limbu S, Singh LR, Okram GS. The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs. RSC Adv 2020; 10:35619-35635. [PMID: 35517071 PMCID: PMC9056912 DOI: 10.1039/d0ra05433j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 09/17/2020] [Indexed: 12/02/2022] Open
Abstract
Li+ incorporated tunable Y2O3:Eu3+ red-emitting nanophosphors were synthesized using a wet chemical method. The effect of Li+ on structural and luminescence properties of the nanophosphors were studied in detail. The structural results exhibited that nanophosphors have a body-centered cubic (I) phase with point group symmetry m3̄. No additional impurity peaks were observed within the range of the XRD pattern due to the Li+ ion. FTIR spectra reveal the formation of the pure and crystalline structure of the nanophosphors. TEM results show the prepared nanophosphors were highly crystalline and polycrystalline in nature. PL studies show the highly enhanced emission band due to the flux effect, greatly improved crystallinity caused by the Li+ ion, and the different excitation wavelengths. The most intense luminescence band was observed at 612 nm for red emission ascribed to the 5D0 → 7F2 transition of Eu3+ ion upon 254, 393, and 465 nm excitations in the C3i and C2 symmetry site of Y2O3 respectively. The highly enhanced emission band was observed under excitation at 254 nm and is 6.9 and 3.67 times higher than the emission band excited at 393 and 466 nm, respectively. The average lifetime also varies with different concentrations of Li+ ions. The chromaticity color coordinates, CCT values, were tuned in the red region of the color space. Hence, the results indicate that the prepared nanophosphor can be used as a red component to construct the white light for light-emitting diode applications. Li+ incorporated tunable Y2O3:Eu3+ red-emitting nanophosphors were synthesized using a wet chemical method.![]()
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Affiliation(s)
- Sanjeeb Limbu
- Department of Nanotechnology, North-Eastern Hill University Shillong-793022 India +91-364-2723903
| | - Laishram Robindro Singh
- Department of Nanotechnology, North-Eastern Hill University Shillong-793022 India +91-364-2723903
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