High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication

查看全文 作　　者：Chun Hong [1]Kang;Ibrahim [2]Dursun;Guangyu [1]Liu;Lutfan [3]Sinatra;Xiaobin [1]Sun;Meiwei [1]Kong;Jun [2]Pan;Partha [2]Maity;Ee-Ning [1]Ooi;Tien Khee [1]Ng;Omar [2]F.Mohammed;Osman [2]M.Bakr;Boon [1]S.Ooi

机构地区：[1]Photonics Laboratory,Division of Computer,Electrical,and Mathematical Sciences and Engineering,King Abdullah University of Science and Technology(KAUST),Thuwal 23955-6900,Kingdom of Saudi Arabia;[2]Division of Physical Science and Engineering,King Abdullah University of Science and Technology(KAUST),Thuwal 23955-6900,Kingdom of Saudi Arabia;[3]Quantum Solutions LLC,Thuwal 23955-6900,Kingdom of Saudi Arabia

出　　处：《Light(Science & Applications)》索引2019年第8卷第1期,共12页

基　　金：supported by funding from King Abdullah University of Science and Technology(KAUST),BAS/1/1614-01-01,KCR/1/2081-01-01 and GEN/1/6607-01-01,and the KAUST-KFUPM Special Initiative,REP/1/2878-01-01;the financial support from the King Abdulaziz City for Science and Technology(KACST),Grant no.KACST TIC R2-FP-008. 摘　　要：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. 关键词：PEROVSKITE ULTRAVIOLET INORGANIC

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High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication

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