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| 1 | High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication显示文摘Optical wireless communication(OWC)using the ultra-broad spectrum of the visible-to-ultraviolet(UV)wavelength region remains a vital field of research for mitigating the saturated bandwidth of radio-frequency(RF)communication.However,the lack of an efficient UV photodetection methodology hinders the development of UV-based communication.The key technological impediment is related to the low UV-photon absorption in existing silicon photodetectors,which offer low-cost and mature platforms.To address this technology gap,we report a hybrid Sibased photodetection scheme by incorporating CsPbBr_(3) perovskite nanocrystals(NCs)with a high photoluminescence quantum yield(PLQY)and a fast photoluminescence(PL)decay time as a UV-to-visible colourconverting layer for high-speed solar-blind UV communication.The facile formation of drop-cast CsPbBr_(3) perovskite NCs leads to a high PLQY of up to ~73% and strong absorption in the UV region.With the addition of the NC layer,a nearly threefold improvement in the responsivity and an increase of ~25% in the external quantum efficiency(EQE)of the solar-blind region compared to a commercial silicon-based photodetector were observed.Moreover,timeresolved photoluminescence measurements demonstrated a decay time of 4.5 ns under a 372-nm UV excitation source,thus elucidating the potential of this layer as a fast colour-converting layer.A high data rate of up to 34 Mbps in solar-blind communication was achieved using the hybrid CsPbBr_(3)-silicon photodetection scheme in conjunction with a 278-nm UVC light-emitting diode(LED).These findings demonstrate the feasibility of an integrated high-speed photoreceiver design of a composition-tuneable perovskite-based phosphor and a low-cost silicon-based photodetector for UV communication. | Chun Hong Kang Ibrahim Dursun Guangyu Liu Lutfan Sinatra Xiaobin Sun Meiwei Kong Jun Pan Partha Maity Ee-Ning Ooi Tien Khee Ng Omar F.Mohammed Osman M.Bakr Boon S.Ooi | 2019 | Light(Science & Applications)2019，8，1： | 14 |
| 2 | 简易转速测量系统设计显示文摘介绍了一种基于定时器的转速测量系统的设计与开发。使用直流电动机的转轴来测量其转速,定时器IC 555用于不稳定模式。使用数字存储示波器(DSO)测量的定时器输出波形的频率几乎与转轴的转速成线性比例,而这个转速又与外部输入电压水平的变化成线性关系,由此得到了定时器输出波形频率与转速之间的线性关系。该系统的主要优点是线性输入-输出,体积小,便于携带且成本低。 | Akash Kumar Anindya Debnath Antar Banik Kabirul Islam Mondal Partha Pratim Biswas Rik Bhattacharyya T K Maiti | 2020 | Journal of Measurement Science and Instrumentation2020，11，2： | 2 |
| 3 | Photophysical study of a charge transfer oxazole dye in micelles: Role of surfactant headgroups显示文摘 | Jyotirmay Maiti Yeasmin Sarkar Partha Pratim Parui Sandipan Chakraborty Suman Biswas Ranjan Das | 2015 | Journal of Luminescence2015，163，： | 1 |
| 4 | There is plenty of room at the top:generation of hot charge carriers and their applications in perovskite and other semiconductor-based optoelectronic devices显示文摘Hot charge carriers(HC)are photoexcited electrons and holes that exist in nonequilibrium high-energy states of photoactive materials.Prolonged cooling time and rapid extraction are the current challenges for the development of future innovative HC-based optoelectronic devices,such as HC solar cells(HCSCs),hot energy transistors(HETs),HC photocatalytic reactors,and lasing devices.Based on a thorough analysis of the basic mechanisms of HC generation,thermalization,and cooling dynamics,this review outlines the various possible strategies to delay the HC cooling as well as to speed up their extraction.Various materials with slow cooling behavior,including perovskites and other semiconductors,are thoroughly presented.In addition,the opportunities for the generation of plasmon-induced HC through surface plasmon resonance and their technological applications in hybrid nanostructures are discussed in detail.By judiciously designing the plasmonic nanostructures,the light coupling into the photoactive layer and its optical absorption can be greatly enhanced as well as the successful conversion of incident photons to HC with tunable energies can also be realized.Finally,the future outlook of HC in optoelectronics is highlighted which will provide great insight to the research community. | Irfan Ahmed Lei Shi Hannu Pasanen Paola Vivo Partha Maity Mohammad Hatamvand Yiqiang Zhan | 2021 | Light(Science & Applications)2021，10，9： | 1 |
| 5 | Impressive near-infrared brightness and singlet oxygen generation from strategic lanthanide-porphyrin double-decker complexes in aqueous solution显示文摘Although lanthanide double-decker complexes with hetero-macrocyclic ligands as functional luminescent and magnetic materials have promising properties,their inferior water solubility has negated their biomedical applications.Herein,four water-soluble homoleptic lanthanide(Ln=Gd,Er,Yb and La)sandwiches with diethylene-glycoldisubstituted porphyrins(DD)are reported,with their structures proven by both quantum chemical calculations and scanning tunneling microscopy.Our findings demonstrate that the near-infrared emission intensity and singlet oxygen(1O2)quantum yields of YbDD and GdDD in aqueous media are higher than those of the reported capped lanthanide monoporphyrinato analogues,YbN and GdN;the brightness and luminescence lifetime in water of YbDD are greater than those of YbN.This work provides a new dimension for the future design and development of molecular theranostics-based water-soluble double-decker lanthanide bisporphyrinates. | Jing-Xiang Zhang Wai-Lun Chan Chen Xie Yan Zhou Ho-Fai Chau Partha Maity George T.Harrison Aram Amassian Omar F.Mohammed Peter A.Tanner Wai-Kwok Wong Ka-Leung Wong | 2019 | Light(Science & Applications)2019，8，1： | 1 |
| 6 | 基于光敏耦合定时器的压频转换器的实现(英文)显示文摘研制了基于定时器的压频转换器,电路主要由工作于非稳态多谐振荡器模式下的定时器LM555和两个光敏电阻构成。由于数字存储振荡器测得的定时器输出波频率与所施加的输入电压基本呈线性比例关系,所研制的转换器为类数字输出,因此具有线性输入/输出关系、体积小、易携带和高性价比等优点。此外,定时器输出波可以直接与PC机、微处理器或微控制器相连,不需要模/数转换器就能完成对输入电压信号的进一步处理。 | Akash Kumar Anindya Debnath Antar Banik Kabirul Islam Mondal Partha Pratim Biswas Rik Bhattacharyya T K Maiti | 2017 | Journal of Measurement Science and Instrumentation2017，8，1： | 1 |
| 7 | Air-Resistant Lead Halide Perovskite Nanocrystals Embedded into Polyimide of Intrinsic Microporosity显示文摘Although cesium lead halide perovskite(CsPbX3,X=Cl,Br,or I)nanocrystals(PNCs)have been rapidly developed for multiple optoelectronic applications due to their outstanding optical and transport properties,their device fabrication and commercialization have been limited by their low structural stability,especially under environmental conditions.In this work,a new approach has been developed to protect the surface of these nanocrystals,which results in enhanced chemical stability and optical properties.This method is based on the encapsulation of CsPbX3 NCs into a polyimide with intrinsic microporosity(PIM-PI),4,4′-(hexafluoroisopropylidene)diphthalic anhydride reacted with 2,4,6-trimethyl-m-phenylenediamine(6FDATrMPD).The presence of 6FDA-TrMPD as a protective layer can efficiently isolate NCs from an air environment and subsequently enhance their optical and photoluminescence stability.More specifically,comparing NCs treated with a polymer to as-synthesized nanocrystals after 168 h,we observe that the PL intensity decreased by 70%and 20%for the NCs before and after polymer treatment.In addition,the PNC film with a polymer shows a much longer excited-state lifetime than the as-synthesized nanocrystals,indicating that the surface trap states are significantly reduced in the treated PNCs.The enhancement in chemical and air stability,as well as optical behavior,will further improve the performance of CsPbBr3 PNCs yielding promising optical devices and paving the way for their production and implementation at a large scale. | Haoze Yang Luis Gutiérrez-Arzaluz Partha Maity Mahmoud AAbdulhamid Jun Yin Yang Zhou Cailing Chen Yu Han Gyorgy Szekely Osman M.Bakr Omar F.Mohammed | 2021 | Energy Material Advances2021，，1： | 0 |
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