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Beegum KAB, Sasi S, Thomas C, Mathew A, Raman R. Bluish-white Light-emitting 2D Sheets of Lead-free Perovskite Cesium Titanium Bromide (CsTiBr 3) by a Two-stage Deposition Technique. J Fluoresc 2023:10.1007/s10895-023-03444-4. [PMID: 37768464 DOI: 10.1007/s10895-023-03444-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
Bluish-white light-emitting materials are commonly used in LED lighting because they produce natural-looking light. Here we report the photoluminescent emission (PL) of novel, two-dimensional lead-free CsTiBr3 perovskite prepared via a two-stage deposition process. The formation of two-dimensional nanosheets of CsTiBr3 perovskite is confirmed by XRD, EDAX, and FESEM analysis. The height of the cesium bromide thin film substrate from the titanium bromide vapor source plays an important role in the formation of two-dimensional CsTiBr3. The CsTiBr3 perovskite nanosheets exhibit unique exciton- luminescence at 440 nm and self-trapped exciton emission at 595 nm which are the characteristics of two-dimensional halide structure, along with the band-to-band emission at 400 nm at an excitation wavelength of 340 nm. The resulting bluish-white light PL emission makes two-dimensional CsTiBr3 perovskite an alternative material to the traditional lead-based perovskite in LEDs, display technology, solid-state lighting, and various optoelectronic devices, addressing environmental concerns.
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Affiliation(s)
- K A Benazeera Beegum
- Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India
| | - Saranya Sasi
- Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India
| | - Christeena Thomas
- Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India
| | - Alex Mathew
- Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India
| | - Reshmi Raman
- Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India.
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Kammar P, Sasi S, Kumar N, Rohila J, deSouza A, Saklani A. Robotic posterior pelvic exenteration for locally advanced rectal cancer - a video vignette. Colorectal Dis 2019; 21:606. [PMID: 30856286 DOI: 10.1111/codi.14606] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 03/05/2018] [Indexed: 02/08/2023]
Affiliation(s)
- P Kammar
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
| | - S Sasi
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
| | - N Kumar
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
| | - J Rohila
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
| | - A deSouza
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
| | - A Saklani
- Colorectal Division, GI services, Tata Memorial Center, Mumbai, India
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Desouza A, Sugoor P, Sasi S, Rohila J, Saklani A. Robotic intersphincteric resection with right seminal vesicle excision via a right vascular approach using the Da Vinci Xi robotic system - a video vignette. Colorectal Dis 2019; 21:492-493. [PMID: 30687990 DOI: 10.1111/codi.14570] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 01/08/2019] [Indexed: 01/12/2023]
Affiliation(s)
- A Desouza
- Division of Gastrointestinal and HPB Surgery, Tata Memorial Centre, Mumbai, India
| | - P Sugoor
- Division of Gastrointestinal and HPB Surgery, Tata Memorial Centre, Mumbai, India
| | - S Sasi
- Division of Gastrointestinal and HPB Surgery, Tata Memorial Centre, Mumbai, India
| | - J Rohila
- Division of Gastrointestinal and HPB Surgery, Tata Memorial Centre, Mumbai, India
| | - A Saklani
- Division of Gastrointestinal and HPB Surgery, Tata Memorial Centre, Mumbai, India
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Desouza A, Sasi S, Verma K, Gupta A, Saklani A. Laparoscopic right extended hemicolectomy - complete mesocolic excision - a video vignette. Colorectal Dis 2019; 21:372. [PMID: 30674077 DOI: 10.1111/codi.14566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 01/08/2019] [Indexed: 01/07/2023]
Affiliation(s)
- A Desouza
- Department of Surgical Oncology, Tata Memorial Hospital, Parel, Mumbai, India
| | - S Sasi
- Department of Surgical Oncology, Tata Memorial Hospital, Parel, Mumbai, India
| | - K Verma
- Department of Surgical Oncology, Tata Memorial Hospital, Parel, Mumbai, India
| | - A Gupta
- Department of Surgical Oncology, Tata Memorial Hospital, Parel, Mumbai, India
| | - A Saklani
- Department of Surgical Oncology, Tata Memorial Hospital, Parel, Mumbai, India
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Sasi S, Rohila J, Kammar P, Kurunkar S, Desouza A, Saklani A. Robotic lateral pelvic lymph node dissection in rectal cancer - a video vignette. Colorectal Dis 2018; 20:554-555. [PMID: 29578655 DOI: 10.1111/codi.14110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 03/12/2018] [Indexed: 02/08/2023]
Affiliation(s)
- S Sasi
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - J Rohila
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - P Kammar
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - S Kurunkar
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - A Desouza
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
| | - A Saklani
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
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Smith C, Sekhar K, Benamar M, Venkateswaran A, Sasi S, Penthala N, Crooks P, Hann S, Geng L, Abbas T, Freeman M. NPM1 as a Target for Radiosensitization of NSCLC Using a Genetic Model and Inhibitor YTR107. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
We have investigated the binding of bepridil to calcium-saturated cardiac troponin C in a cardiac troponin C/troponin I complex. Nuclear magnetic resonance spectroscopy and [(15)N,(2)H]cardiac troponin C permitted the mapping of bepridil-induced amide proton chemical shifts. A single bepridil-binding site in the regulatory domain was found with an affinity constant of approximately 140 microM(-1). In the presence of cardiac troponin I, bepridil binding to the C domain of cardiac troponin C was not detected. The pattern of bepridil-induced chemical shifts is consistent with stabilization of more open regulatory domain conformational states. A similar pattern of chemical shift perturbations was observed for interaction of the troponin I cardiac-specific amino-terminus with the cardiac troponin C regulatory domain. These results suggest that both bepridil and the cardiac-specific amino-terminus may mediate an increase in calcium affinity by interacting with and stabilizing open regulatory domain conformations. Chemical shift mapping suggests a possible role for inactive calcium-binding site I in the modulation of calcium affinity.
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Affiliation(s)
- E Abusamhadneh
- Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati, College of Medicine, 231 Albert B. Sabin Way, Cincinnati, OH 45267, USA
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