1
|
Xiao H, Zhang K, Xu B, Shen H, Wang L, Sun C. High-brightness green CdSe/ZnS quantum dots stimulated by solar-blind deep-ultraviolet light in optical wireless communications. OPTICS LETTERS 2024; 49:3596-3599. [PMID: 38950218 DOI: 10.1364/ol.521760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 06/04/2024] [Indexed: 07/03/2024]
Abstract
Ultraviolet-based optical wireless communication (OWC) is emerging as a significant technology for the next-generation secure communication, particularly within the solar-blind spectra. In this study, we have synthesized two types of green-emitting II-VI family colloidal quantum dots (QDs), specifically ZnCdSe/ZnS and CdSe/CdZnS/ZnS QDs, which are stimulated by ultraviolet (UV) and solar-blind deep-ultraviolet (DUV) light, respectively. With a transmission distance of 1.5 m, the maximum data rate of ZnCdSe/ZnS QDs reaches 40 Mb/s, which is below the forward-error-correction (FEC) limit (3.8 × 10-3) when excited by 385-nm UV light. However, both brightness and bit error rate are significantly deteriorated when excited by 280-nm DUV light. Conversely, 28 and 24 Mb/s were attained using CdSe/CdZnS/ZnS QDs under UV and DUV excitation, respectively. Our studies on light-conversion and communication capabilities of green QDs within the DUV OWC system may provide valuable insights for subsequent research in the field.
Collapse
|
2
|
Pramanik S, Roy S, Bhandari S. Luminescence Enhancement based Sensing of L-Cysteine by Doped Quantum Dots. Chem Asian J 2020; 15:1948-1952. [PMID: 32351051 DOI: 10.1002/asia.202000466] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 04/24/2020] [Indexed: 11/11/2022]
Abstract
The interaction of a presynthesized orange emitting Mn2+ -doped ZnS quantum dots (QDs) with L-Cysteine (L-Cys) led to enhance emission intensity (at 596 nm) and quantum yield (QY). Importantly, the Mn2+ -doped ZnS QDs exhibited high sensitivity towards L-Cys, with a limit of detection of 0.4±0.02 μM (in the linear range of 3.3-13.3 μM) and high selectivity in presence of interfering amino acids and metal ions. The association constant of L-Cys was determined to be 0.36×105 M-1 . The amplified passivation of the surface of Mn2+ -doped ZnS QDs following the incorporation and binding of L-Cys is accounted for the enhancement in their luminescence features. Moreover, the luminescence enhancement-based detection will bring newer dimension towards sensing application.
Collapse
Affiliation(s)
- Sabyasachi Pramanik
- Department of Chemistry, National Institute of Technology Sikkim, Sikkim, 737139, India
| | - Shilaj Roy
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Assam, 781039, India
| | - Satyapriya Bhandari
- Physics Discipline, Indian Institute of Technology Gandhinagar, Gujrat, 382355, India
| |
Collapse
|
3
|
Bhandari S, Roy S, Pramanik S, Chattopadhyay A. Chemical Reactions Involving the Surface of Metal Chalcogenide Quantum Dots. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14399-14413. [PMID: 31288518 DOI: 10.1021/acs.langmuir.9b01285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This invited feature article focuses on the chemical reactions involving the surface ions of colloidal quantum dots (Qdots). Emphasis is placed on ion-exchange, redox, and complexation reactions. The pursuit of reactions involving primarily the cations on the surface results in changes in the optical properties of the Qdots and also may confer new properties owing to the newly formed surface species. For example, the cation-exchange reaction, leading to systematic removal of the cations present on the as-synthesized Qdots, enhances the photoluminescence quantum yield. On the other hand, redox reactions, involving the dopant cations in the Qdots, could not only modulate the photoluminescence quantum yield but also give rise to new emission not present in the as-synthesized Qdots. Importantly, the cations present on the surface could be made to react with external organic ligands to form inorganic complexes, thus providing a new species defined as the quantum dot complex (QDC). In the QDC, the properties of Qdots and the inorganic complex are not only present but also enhanced. Furthermore, by varying reaction conditions such as the concentrations of the species and using a mixture of ligands, the properties could be further tuned and multifunctionalization of the Qdot could be achieved. Thus, chemical, magnetic, and optical properties could be simultaneously conferred on the same Qdot. This has helped in externally controlled bioimaging, white light generation involving individual quantum dots, and highly sensitive molecular sensing. Understanding the species (i.e., the newly formed inorganic complex) on the surface of the Qdot and its chemical reactivity provide unique options for futuristic technological applications involving a combination of an inorganic complex and a Qdot.
Collapse
Affiliation(s)
- Satyapriya Bhandari
- Department of Chemistry and Centre for Nanotechnology , Indian Institute of Technology Guwahati , Guwahati, Assam 781039 , India
| | - Shilaj Roy
- Department of Chemistry and Centre for Nanotechnology , Indian Institute of Technology Guwahati , Guwahati, Assam 781039 , India
| | - Sabyasachi Pramanik
- Department of Chemistry and Centre for Nanotechnology , Indian Institute of Technology Guwahati , Guwahati, Assam 781039 , India
| | - Arun Chattopadhyay
- Department of Chemistry and Centre for Nanotechnology , Indian Institute of Technology Guwahati , Guwahati, Assam 781039 , India
| |
Collapse
|
4
|
Zhang J, Zhang J, Liu X, Xu T, Liu S, Hou X, Tong J, Wang Y, Wang Y, Albolkany MK, Liu B. Hyperstable chromium(iii)/manganese(ii) bimetallic wheel clusters with visible photoactivity. Dalton Trans 2019; 48:10669-10675. [PMID: 31240286 DOI: 10.1039/c9dt02006c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Two new chromium and manganese bimetallic nanoclusters, [Cr8-xMnx(OH)8-x(H2O)x(OOCC6H5)16, x = 1.11] (1) and [Cr4Mn4O4(OOCC6H5)12·3CH3CN·H2O] (2), have been synthesized in a one-pot solvothermal reaction in this work. Under visible irradiation, cluster 1 can produce an increased photocurrent and exhibits significant visible-light-driven photocatalytic activity for H2 evolution in an aqueous system. Most importantly, it exhibits ultrahigh stability in both acid and base aqueous solutions, making it an excellent synthon for preparing functional materials.
Collapse
Affiliation(s)
- Junxiang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Jian Zhang
- School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230021, P. R. China
| | - Xuguang Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Tingting Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Shengjun Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Xudong Hou
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Jing Tong
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Yan Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Yang Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Mohamed K Albolkany
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| | - Bo Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, Hefei Science Center of CAS, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
| |
Collapse
|
5
|
Bhandari S, Pramanik S, Khandelia R, Chattopadhyay A. Gold Nanocluster and Quantum Dot Complex in Protein for Biofriendly White-Light-Emitting Material. ACS APPLIED MATERIALS & INTERFACES 2016; 8:1600-5. [PMID: 26741861 DOI: 10.1021/acsami.6b00039] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report the synthesis of a biofriendly highly luminescent white-light-emitting nanocomposite. The composite consisted of Au nanoclusters and ZnQ2 complex (on the surface of ZnS quantum dots) embedded in protein. The combination of red, green, and blue luminescence from clusters, complex, and protein, respectively, led to white light generation.
Collapse
Affiliation(s)
- Satyapriya Bhandari
- Department of Chemistry and §Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Sabyasachi Pramanik
- Department of Chemistry and §Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Rumi Khandelia
- Department of Chemistry and §Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Arun Chattopadhyay
- Department of Chemistry and §Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| |
Collapse
|
6
|
Gogoi M, Chattopadhyay A. White light emission from quantum dot and a UV-visible emitting Pd-complex on its surface. RSC Adv 2016. [DOI: 10.1039/c6ra22985a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Near white light emission (CIE 0.35, 0.29) has been achieved as a combination of intraligand transition, aggregate induced emission and dopant emission followed by surface complexation on Qdot surface.
Collapse
Affiliation(s)
- Madhulekha Gogoi
- Department of Chemistry and Centre for Nanotechnology
- Indian Institute of Technology Guwahati
- Guwahati-781039
- India
| | - Arun Chattopadhyay
- Department of Chemistry and Centre for Nanotechnology
- Indian Institute of Technology Guwahati
- Guwahati-781039
- India
| |
Collapse
|
7
|
Baek SW, Shim JH, Park JG. The energy-down-shift effect of Cd(0.5)Zn(0.5)S-ZnS core-shell quantum dots on power-conversion-efficiency enhancement in silicon solar cells. Phys Chem Chem Phys 2015; 16:18205-10. [PMID: 25054543 DOI: 10.1039/c4cp00794h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We found that Cd0.5Zn0.5S-ZnS core (4.2 nm in diameter)-shell (1.2 nm in thickness) quantum dots (QDs) demonstrated a typical energy-down-shift (2.76-4.96 → 2.81 eV), which absorb ultra-violet (UV) light (250-450 nm in wavelength) and emit blue visible light (∼442 nm in wavelength). They showed the quantum yield of ∼80% and their coating on the SiNX film textured p-type silicon solar-cells enhanced the external-quantum-efficiency (EQE) of ∼30% at 300-450 nm in wavelength, thereby enhancing the short-circuit-current-density (JSC) of ∼2.23 mA cm(-2) and the power-conversion-efficiency (PCE) of ∼1.08% (relatively ∼6.04% increase compared with the reference without QDs for p-type silicon solar-cells). In particular, the PCE peaked at a specific coating thickness of the Cd0.5Zn0.5S-ZnS core-shell QD layer; i.e., the 1.08% PCE enhancement at the 8.8 nm thick QD layer.
Collapse
Affiliation(s)
- Seung-Wook Baek
- Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Republic of Korea.
| | | | | |
Collapse
|
8
|
Pramanik S, Bhandari S, Roy S, Chattopadhyay A. Synchronous Tricolor Emission-Based White Light from Quantum Dot Complex. J Phys Chem Lett 2015; 6:1270-4. [PMID: 26262986 DOI: 10.1021/acs.jpclett.5b00295] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Herein we report the generation of synchronous tricolor emission for a single wavelength excitation from a quantum dot complex (QDC). The single-component QDC was formed out of a complexation reaction, at room temperature, between ligand-free Mn(2+)-doped ZnS quantum dots (Qdots) and a mixture of two organic ligands (acetylsalicylic acid and 8-hydroxyquinoline). Furthermore, the tunability in chromaticity color coordinates, which is important for solid-state lighting, was achieved following the synthesis of QDC. Moreover, the photostable QDC emitted white light (λex 320 nm) with (0.30, 0.33) and (0.32, 0.32) chromaticity color coordinates in the liquid and the solid phases, respectively. Hence, the white light-emitting QDC may be a superior material for light-emitting applications.
Collapse
Affiliation(s)
- Sabyasachi Pramanik
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Satyapriya Bhandari
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Shilaj Roy
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Arun Chattopadhyay
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| |
Collapse
|
9
|
Bhandari S, Roy S, Pramanik S, Chattopadhyay A. Double channel emission from a redox active single component quantum dot complex. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:551-561. [PMID: 25459633 DOI: 10.1021/la504139m] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Herein we report the generation and control of double channel emission from a single component system following a facile complexation reaction between a Mn(2+) doped ZnS colloidal quantum dot (Qdot) and an organic ligand (8-hydroxy quinoline; HQ). The double channel emission of the complexed quantum dot-called the quantum dot complex (QDC)-originates from two independent pathways: one from the complex (ZnQ2) formed on the surface of the Qdot and the other from the dopant Mn(2+) ions of the Qdot. Importantly, reaction of ZnQ2·2H2O with the Qdot resulted in the same QDC formation. The emission at 500 nm with an excitation maximum at 364 nm is assigned to the surface complex involving ZnQ2 and a dangling sulfide bond. On the other hand, the emission at 588 nm-with an excitation maximum at 330 nm-which is redox tunable, is ascribed to Mn(2+) dopant. The ZnQ2 complex while present in QDC has superior thermal stability in comparison to the bare complex. Interestingly, while the emission of Mn(2+) was quenched by an electron quencher (benzoquinone), that due to the surface complex remained unaffected. Further, excitation wavelength dependent tunability in chromaticity color coordinates makes the QDC a potential candidate for fabricating a light emitting device of desired color output.
Collapse
Affiliation(s)
- Satyapriya Bhandari
- Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati , Guwahati-781039, Assam, India
| | | | | | | |
Collapse
|
10
|
Begum R, Chattopadhyay A. Redox-Tuned Three-Color Emission in Double (Mn and Cu) Doped Zinc Sulfide Quantum Dots. J Phys Chem Lett 2014; 5:126-130. [PMID: 26276191 DOI: 10.1021/jz402495h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The photoluminescence characteristics of colloidal Mn(2+) and Cu(2+) (double) doped zinc sulfide (ZnS) quantum dots (Qdots) could be drastically influenced by reactions with redox reagents. Importantly, experiments revealed Cu(+) in ZnS nanocrystals rather than Cu(2+), in conjunction with Mn(2+), as the emitting dopant. Thus, as-synthesized aqueous Qdots emitted orange (with peaks at 460 and 592 nm) due to the host and Mn(2+) dopant emissions. However, upon treatment with a reducing agent, the color changed to yellow with dual peaks positioned at 520 and 590 nm due to Cu(+) and Mn(2+) dopant emissions. The characteristics could be changed reversibly with appropriate redox reagents. Further, treatment with excess of an oxidizing agent led to blue emission with a single peak at 450 nm.
Collapse
Affiliation(s)
- Raihana Begum
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781 039, India
| | - Arun Chattopadhyay
- †Department of Chemistry and ‡Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781 039, India
| |
Collapse
|
11
|
Bhandari S, Roy S, Chattopadhyay A. Enhanced photoluminescence and thermal stability of zinc quinolate following complexation on the surface of quantum dots. RSC Adv 2014. [DOI: 10.1039/c4ra03341h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
12
|
Zhu D, Li W, Ma L, Lei Y. Glutathione-functionalized Mn:ZnS/ZnO core/shell quantum dots as potential time-resolved FRET bioprobes. RSC Adv 2014. [DOI: 10.1039/c3ra45491f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
13
|
|
14
|
Xuan T, Wang S, Wang X, Liu J, Chen J, Li H, Pan L, Sun Z. Single-step noninjection synthesis of highly luminescent water soluble Cu+ doped CdS quantum dots: application as bio-imaging agents. Chem Commun (Camb) 2013; 49:9045-7. [DOI: 10.1039/c3cc44601h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
15
|
Bhandari S, Begum R, Chattopadhyay A. Surface ion engineering for tuning dual emission of ZnxCd1−xS nanocrystals. RSC Adv 2013. [DOI: 10.1039/c2ra22447j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
16
|
Lin B, Yao X, Zhu Y, Shen J, Yang X, Jiang H, Zhang X. Multifunctional manganese-doped core–shell quantum dots for magnetic resonance and fluorescence imaging of cancer cells. NEW J CHEM 2013. [DOI: 10.1039/c3nj00407d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|