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Modak MD, Damarla G, Maity S, Chaudhary AK, Paik P. Self-assembled pearl-necklace patterned upconverting nanocrystals with highly efficient blue and ultraviolet emission: femtosecond laser based upconversion properties. RSC Adv 2019; 9:38246-38256. [PMID: 35541825 PMCID: PMC9075863 DOI: 10.1039/c9ra06389g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 11/15/2019] [Indexed: 12/25/2022] Open
Abstract
This work reports new findings on the formation of a pearl-necklace pattern in self-assembled upconverting nanocrystals (UCN-PNs) which exhibit strong upconversion emission under an NIR excitation source of a femtosecond laser (Fs-laser). Each nano-necklace consists of several upconversion nanoparticles (UCNPs) having a size ca. 10 ± 1 nm. UCN-PNs are arranged in a self-organized manner to form necklace type chains with an average length of 140 nm of a single row of nanoparticles. Furthermore, UCN-PNs are comprised of UCNPs with an average interparticle separation of ca. 4 nm in each of the nanonecklace chains. Interestingly, these UCN-PNs exhibit high energy upconversion especially in the UV region on interaction with a 140 Fs-laser pulse duration at 80 MHz repetition rate and intense blue emission at 450 nm on interaction with a 900 nm excitation source is obtained. The preparation of self-assembled UCNPs is easy and they are very stable for a longer period of time. The emission (fluorescence/luminescence) intensity is very high which can make them unique in innumerable industrial and bio-applications such as for disease diagnosis and therapeutic applications by targeting the infected cells with enhanced efficiency. Self-assembled pearl necklace patterned-upconverting nanoparticles and their femtosecond laser based upconversion properties.![]()
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Affiliation(s)
- Monami Das Modak
- School of Engineering Sciences and Technology
- University of Hyderabad
- Hyderabad 500 046
- India
| | - Ganesh Damarla
- Advanced Center of Research in High Energy Materials
- University of Hyderabad
- Hyderabad
- India
| | - Somedutta Maity
- School of Engineering Sciences and Technology
- University of Hyderabad
- Hyderabad 500 046
- India
| | - Anil K. Chaudhary
- Advanced Center of Research in High Energy Materials
- University of Hyderabad
- Hyderabad
- India
| | - Pradip Paik
- School of Biomedical Engineering
- Indian Institute of Technology
- BHU
- Varanasi 221 005
- India
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Tong S, Sun J, Yang J. Printed Thin-Film Transistors: Research from China. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25902-25924. [PMID: 29494132 DOI: 10.1021/acsami.7b16413] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Thin-film transistors (TFTs) have experienced tremendous development during the past decades and show great promising applications in flat displays, sensors, radio frequency identification tags, logic circuit, and so on. The printed TFTs are the key components for rapid development and commercialization of printed electronics. The researchers in China play important roles to accelerate the development and commercialization of printed TFTs. In this review, we comprehensively summarize the research progress of printed TFTs on rigid and flexible substrates from China. The review will focus on printing techniques of TFTs, printed TFT components including semiconductors, dielectrics and electrodes, as well as fully printed TFTs and printed flexible TFTs. Furthermore, perspectives on the remaining challenges and future developments are proposed.
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Affiliation(s)
- Sichao Tong
- Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics , Central South University , Changsha 410083 , Hunan , China
| | - Jia Sun
- Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics , Central South University , Changsha 410083 , Hunan , China
| | - Junliang Yang
- Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics , Central South University , Changsha 410083 , Hunan , China
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Zhang M, Wen H, Pan X, Yu J, Shao H, Ai F, Yu H, Tang M, Gai L. Study on Upconversion and Thermal Properties of Tm 3+/Yb 3+ Co-Doped La₂O₃-Nb₂O₅-Ta₂O₅ Glasses. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1352. [PMID: 30081516 PMCID: PMC6119997 DOI: 10.3390/ma11081352] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 07/25/2018] [Accepted: 08/01/2018] [Indexed: 01/15/2023]
Abstract
The effect of Yb3+ ions on upconversion luminescence and thermal properties of Tm3+/Yb3+ co-doped La₂O₃-Nb₂O₅-Ta₂O₅ glasses has been studied. Glass transition temperature is around 740 °C, indicating high thermal stability. The effect of Yb3+ ions on the thermal stability is not obvious. Both the glass forming ability and the upconversion luminescence first increase and then decrease with the increase of Yb3+ ions. The glasses perform low glass forming ability with ΔT around 55 °C. Blue and red emissions centered around 477, 651, and 706 nm are obtained at the excitation of 976 nm laser. The upconversion luminescence mechanism is energy transfer from Yb3+ to Tm3+ mixed with two- and three- photon processes. The thermal kinetic Differential Thermal Analysis (DTA)-analysis indicates that the average activation energy first increases and then decreases with the increase of Yb3+ ions. This result can be introduced in order to improve upconversion luminescence of glasses by crystallization in the future. Tm3+/Yb3+ co-doped La₂O₃-Nb₂O₅-Ta₂O₅ glasses with good upconversion and thermal properties show promising applications in solid-state laser, optical temperature sensing.
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Affiliation(s)
- Minghui Zhang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan.
| | - Haiqin Wen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Xiuhong Pan
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Jianding Yu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Hui Shao
- School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
| | - Fei Ai
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Huimei Yu
- School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Meibo Tang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Lijun Gai
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
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