Abstract

Unlike organic–inorganic hybrid perovskites, all-inorganic cesium lead halide perovskites hold great promise for developing high-performance optoelectronic devices, owing to their improved stability. Herein, we investigate the perovskite-related CsPb2Br5 nanoplatelets (NPLs) with tunable emission wavelengths via changing the reaction temperatures to 100°C, 120°C, and 140°C. Reaction temperature plays a key role in determining the shapes and thicknesses of the resulting CsPb2Br5 NPLs. A higher temperature is in favor of the formation of smaller and thicker NPLs. To develop their potential applications in optoelectronic devices, green light emitting diodes (LEDs) and photodetectors based on CsPb2Br5 NPLs are fabricated. The green LEDs based on CsPb2Br5 NPLs synthesized at 140°C exhibit an excellent pure green emission (full width at half-maximum of <20  nm) and display a luminous efficiency of 34.49  lm/W under an operation current of 10 mA. Moreover, the photodetector based on CsPb2Br5 NPLs synthesized at 100°C has better performance with a rise time of 0.426 s, a decay time of 0.422 s, and a ratio of the current (with and without irradiation) of 364%.

© 2017 Chinese Laser Press

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2017 (5)

W. Deng, L. Huang, X. Xu, X. Zhang, X. Jin, S. Lee, and J. Jie, “Ultrahigh-responsivity photodetectors from perovskite nanowire arrays for sequentially tunable spectral measurement,” Nano Lett. 17, 2482–2489 (2017).
[Crossref]

J. Li, L. Xu, T. Wang, J. Song, J. Chen, J. Xue, Y. Dong, B. Cai, Q. Shan, B. Han, and H. Zeng, “50-fold EQE improvement up to 6.27% of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand,” Adv. Mater. 29, 1603885 (2017).
[Crossref]

X. Tang, Z. Hu, W. Yuan, W. Hu, H. Shao, D. Han, J. Zheng, J. Hao, Z. Zang, and J. Du, “Perovskite CsPb2Br5 microplate laser with enhanced stability and tunable properties,” Adv. Opt. Mater. 5, 1600788 (2017).
[Crossref]

F. Palazon, S. Dogan, S. Marras, F. Locardi, I. Nelli, P. Rastogi, M. Ferretti, M. Prato, R. Krahne, and L. Manna, “From CsPbBr3 nano-inks to sintered CsPbBr3–CsPb2Br5 films via thermal annealing: implications on optoelectronic properties,” J. Phys. Chem. C 121, 11956–11961 (2017).
[Crossref]

X. Li, D. Yu, J. Chen, Y. Wang, F. Cao, Y. Wei, Y. Wu, L. Wang, Y. Zhu, Z. Sun, J. Ji, Y. Shen, H. Sun, and H. Zeng, “Constructing fast carrier tracks into flexible perovskite photodetectors to greatly improve responsivity,” ACS Nano 11, 2015–2023 (2017).
[Crossref]

2016 (21)

K. Wei, Z. Xu, R. Chen, X. Zheng, X. Cheng, and T. Jiang, “Temperature-dependent excitonic photoluminescence excited by two-photon absorption in perovskite CsPbBr3 quantum dots,” Opt. Lett. 41, 3821–3824 (2016).
[Crossref]

P. Zhou, X. Zhang, X. Liu, J. Xu, and L. Li, “Temperature-dependent photoluminescence properties of quaternary ZnAgInS quantum dots,” Opt. Express 24, 19506–19516 (2016).
[Crossref]

X. Li, Y. Wu, S. Zhang, B. Cai, Y. Gu, J. Song, and H. Zeng, “CsPbX3 quantum dots for lighting and displays: room temperature synthesis, photoluminescence superiorities, underlying origins and white light-emitting diodes,” Adv. Funct. Mater. 26, 2435–2445 (2016).
[Crossref]

Y. Chen, M. Zheng, Y. Xiao, H. Dong, H. Zhang, J. Zhuang, H. Hu, B. Lei, and Y. Liu, “A self-quenching resistant carbon-dot powder with tunable solid-state fluorescence and construction of dual-fluorescence morphologies for white light-emission,” Adv. Mater. 28, 312–318 (2016).
[Crossref]

J. Li, X. Yuan, P. Jing, J. Li, M. Wei, J. Hua, J. Zhao, and L. Tian, “Temperature-dependent photoluminescence of inorganic perovskite nanocrystal films,” RSC Adv. 6, 78311–78316 (2016).

S. Eatona, M. Laia, N. Gibsona, A. Wonga, L. Dou, J. Ma, L. Wang, S. Leonea, and P. Yang, “Lasing in robust cesium lead halide perovskite nanowires,” Proc. Natl. Acad. Sci. USA 113, 1993–1998 (2016).
[Crossref]

S. Sun, D. Yuan, Y. Xu, A. Wang, and Z. Deng, “Ligand-mediated synthesis of shape controlled cesium lead halide perovskite nanocrystals via reprecipitation process at room temperature,” ACS Nano 10, 3648–3657 (2016).
[Crossref]

Q. Akkerman, S. Motti, S. Kandada, E. Mosconi, V. D’Innocenzo, G. Bertoni, S. Marras, B. Kamino, L. Miranda, F. Angelis, A. Petrozza, M. Prato, and L. Manna, “Solution synthesis approach to colloidal cesium lead halide perovskite nanoplatelets with monolayer-level thickness control,” J. Am. Chem. Soc. 138, 1010–1016 (2016).
[Crossref]

L. Lv, Y. Xu, H. Fang, W. Luo, F. Xu, L. Liu, B. Wang, X. Zhang, D. Yang, W. Hu, and A. Dong, “Generalized colloidal synthesis of high-quality, two-dimensional cesium lead halide perovskite nanosheets and their applications in photodetectors,” Nanoscale 8, 13589–13596 (2016).
[Crossref]

J. Song, L. Xu, J. Li, J. Xue, Y. Dong, X. Li, and H. Zeng, “Monolayer and few-layer all-inorganic perovskites as a new family of two-dimensional semiconductors for printable optoelectronic devices,” Adv. Mater. 28, 4861–4869 (2016).
[Crossref]

A. Pan, B. He, X. Fan, Z. Liu, J. Urban, A. Alivisatos, L. He, and Y. Liu, “Insight into the ligand-mediated synthesis of colloidal CsPbBr3 perovskite nanocrystals: the role of organic acid, base, and cesium precursors,” ACS Nano 10, 7943–7954 (2016).
[Crossref]

G. Li, H. Wang, Z. Zhu, Y. Chang, T. Zhang, Z. Song, and Y. Jiang, “Shape and phase evolution from CsPbBr3 perovskite nanocubes to tetragonal CsPb2Br5 nanosheets with an indirect bandgap,” Chem. Commun. 52, 11296–11299 (2016).
[Crossref]

X. Zhang, B. Xu, J. Zhang, Y. Gao, Y. Zheng, K. Wang, and X. Sun, “All-inorganic perovskite nanocrystals for high-efficiency light emitting diodes: dual-phase CsPbBr3–CsPb2Br5,” Adv. Funct. Mater. 26, 4595–4600 (2016).
[Crossref]

K. Wang, L. Wu, L. Li, H. Yao, H. Qian, and S. Yu, “Large-scale synthesis of highly luminescent perovskite-related CsPb2Br5 nanoplatelets and their fast anion exchange,” Angew. Chem. 55, 8328–8332 (2016).
[Crossref]

J. Zhou, Y. Chu, and J. Huang, “Photodetectors based on two-dimensional layer-structured hybrid lead iodide perovskite semiconductors,” ACS Appl. Mater. Interfaces 8, 25660–25666 (2016).
[Crossref]

S. Veldhuis, P. Boix, N. Yantara, M. Li, T. Sum, N. Mathews, and S. Mhaisalkar, “Perovskite materials for light-emitting diodes and lasers,” Adv. Mater. 28, 6804–6834 (2016).
[Crossref]

F. Wang, J. Mei, Y. Wang, L. Zhang, H. Zhao, and D. Zhao, “Fast photoconductive responses in organometal halide perovskite photodetectors,” ACS Appl. Mater. Interfaces 8, 2840–2846 (2016).
[Crossref]

H. Yoon, H. Kang, S. Lee, J. Oh, H. Yang, and Y. Do, “Study of perovskite QD down-converted LEDs and six-color white LEDs for future displays with excellent color performance,” ACS Appl. Mater. Interfaces 8, 18189–18200 (2016).
[Crossref]

M. Saliba, T. Matsui, J. Seo, K. Domanski, J. Correa-Baena, M. Nazeeruddin, S. Zakeeruddin, W. Tress, A. Abate, A. Hagfeldtd, and M. Grätzel, “Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency,” Energy Environ. Sci. 9, 1989–1997 (2016).
[Crossref]

R. Beal, D. Slotcavage, T. Leijtens, A. Bowring, R. Belisle, W. Nguyen, G. Burkhard, E. Hoke, and M. McGehee, “Cesium lead halide perovskites with improved stability for tandem solar cells,” J. Phys. Chem. Lett. 7, 746–751 (2016).
[Crossref]

Y. Dong, Y. Gu, Y. Zou, J. Song, L. Xu, J. Li, J. Xue, X. Li, and H. Zeng, “Improving all-inorganic perovskite photodetectors by preferred orientation and plasmonic effect,” Small 12, 5622–5632 (2016).
[Crossref]

2015 (14)

B. Conings, J. Drijkoningen, N. Gauquelin, A. Babayigit, J. D’Haen, L. D’Olieslaeger, A. Ethirajan, J. Verbeeck, J. Manca, E. Mosconi, F. Angelis, and H. Boyen, “Intrinsic thermal instability of methylammonium lead trihalide perovskite,” Adv. Energy Mater. 5, 1500477 (2015).
[Crossref]

N. Jeon, J. Noh, W. Yang, Y. Kim, S. Ryu, J. Seo, and S. Seok, “Compositional engineering of perovskite materials for high-performance solar cells,” Nature 517, 476–480 (2015).
[Crossref]

Q. Dong, Y. Fang, Y. Shao, P. Mulligan, J. Qiu, L. Cao, and J. Huang, “Electron–hole diffusion lengths >175  μm in solution-grown CH3NH3PbI3 single crystals,” Science 347, 967–970 (2015).
[Crossref]

D. Jang, K. Park, D. Kim, J. Park, F. Shojaei, H. Kang, J. Ahn, J. Lee, and J. Song, “Reversible halide exchange reaction of organometal trihalide perovskite colloidal nanocrystals for full-range band gap tuning,” Nano Lett. 15, 5191–5199 (2015).
[Crossref]

Y. Wang, X. Li, J. Song, L. Xiao, H. Zeng, and H. Sun, “All-inorganic colloidal perovskite quantum dots: a new class of lasing materials with favorable characteristics,” Adv. Mater. 27, 7101–7108 (2015).
[Crossref]

S. Yakunin, L. Protesescu, F. Krieg, M. Bodnarchuk, G. Nedelcu, M. Humer, G. Luca, M. Fiebig, W. Heiss, and M. Kovalenko, “Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of cesium lead halide perovskites,” Nat. Commun. 6, 8056 (2015).
[Crossref]

F. Zhang, H. Zhong, C. Chen, X. Wu, X. Hu, H. Huang, J. Han, B. Zou, and Y. Dong, “Brightly luminescent and color tunable colloidal CH3NH3PbX3(X = Br, I, Cl) quantum dots: potential alternatives for display technology,” ACS Nano 9, 4533–4542 (2015).
[Crossref]

D. Zhang, S. Eaton, Y. Yu, L. Dou, and P. Yang, “Solution-phase synthesis of cesium lead halide perovskite nanowires,” J. Am. Chem. Soc. 137, 9230–9233 (2015).
[Crossref]

Y. Bekenstein, B. Koscher, S. Eaton, P. Yang, and A. Alivisatos, “Highly luminescent colloidal nanoplates of perovskite cesium lead halide and their oriented assemblies,” J. Am. Chem. Soc. 137, 16008–16011 (2015).
[Crossref]

Q. Akkerman, V. D’Innocenzo, S. Accornero, A. Scarpellini, A. Petrozza, M. Prato, and L. Manna, “Tuning the optical properties of cesium lead halide perovskite nanocrystals by anion exchange reactions,” J. Am. Chem. Soc. 137, 10276–10281 (2015).
[Crossref]

H. Huang, A. Susha, S. Kershaw, T. Hung, and L. Rogach, “Control of emission color of high quantum yield CH3NH3PbBr3 perovskite quantum dots by precipitation temperature,” Adv. Sci. 2, 1500194 (2015).
[Crossref]

L. Protesescu, S. Yakunin, M. Bodnarchuk, F. Krieg, R. Caputo, C. Hendon, R. Yang, A. Walsh, and M. Kovalenko, “Nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I): novel optoelectronic materials showing bright emission with wide color gamut,” Nano Lett. 15, 3692–3696 (2015).
[Crossref]

W. Nie, H. Tsai, R. Asadpour, J. Blancon, A. Neukirch, G. Gupta, J. Crochet, M. Chhowalla, S. Tretiak, M. Alam, H. Wang, and A. Mohite, “High-efficiency solution-processed perovskite solar cells with millimeter-scale grains,” Science 347, 522–525 (2015).
[Crossref]

Y. Zhang, J. Du, X. Wu, G. Zhang, Y. Chu, D. Liu, Y. Zhao, Z. Liang, and J. Huang, “Ultrasensitive photodetectors based on island-structured CH3NH3PbI3 thin films,” ACS Appl. Mater. Interfaces 7, 21634–21638 (2015).
[Crossref]

2014 (2)

X. Hu, X. Zhang, L. Liang, J. Bao, S. Li, W. Yang, and Y. Xie, “High-performance flexible broadband photodetector based on organolead halide perovskite,” Adv. Funct. Mater. 24, 7373–7380 (2014).
[Crossref]

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W. Nie, H. Tsai, R. Asadpour, J. Blancon, A. Neukirch, G. Gupta, J. Crochet, M. Chhowalla, S. Tretiak, M. Alam, H. Wang, and A. Mohite, “High-efficiency solution-processed perovskite solar cells with millimeter-scale grains,” Science 347, 522–525 (2015).
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X. Li, Y. Wu, S. Zhang, B. Cai, Y. Gu, J. Song, and H. Zeng, “CsPbX3 quantum dots for lighting and displays: room temperature synthesis, photoluminescence superiorities, underlying origins and white light-emitting diodes,” Adv. Funct. Mater. 26, 2435–2445 (2016).
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L. Protesescu, S. Yakunin, M. Bodnarchuk, F. Krieg, R. Caputo, C. Hendon, R. Yang, A. Walsh, and M. Kovalenko, “Nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I): novel optoelectronic materials showing bright emission with wide color gamut,” Nano Lett. 15, 3692–3696 (2015).
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J. Li, L. Xu, T. Wang, J. Song, J. Chen, J. Xue, Y. Dong, B. Cai, Q. Shan, B. Han, and H. Zeng, “50-fold EQE improvement up to 6.27% of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand,” Adv. Mater. 29, 1603885 (2017).
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X. Li, D. Yu, J. Chen, Y. Wang, F. Cao, Y. Wei, Y. Wu, L. Wang, Y. Zhu, Z. Sun, J. Ji, Y. Shen, H. Sun, and H. Zeng, “Constructing fast carrier tracks into flexible perovskite photodetectors to greatly improve responsivity,” ACS Nano 11, 2015–2023 (2017).
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Chen, Y.

Y. Chen, M. Zheng, Y. Xiao, H. Dong, H. Zhang, J. Zhuang, H. Hu, B. Lei, and Y. Liu, “A self-quenching resistant carbon-dot powder with tunable solid-state fluorescence and construction of dual-fluorescence morphologies for white light-emission,” Adv. Mater. 28, 312–318 (2016).
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Q. Akkerman, V. D’Innocenzo, S. Accornero, A. Scarpellini, A. Petrozza, M. Prato, and L. Manna, “Tuning the optical properties of cesium lead halide perovskite nanocrystals by anion exchange reactions,” J. Am. Chem. Soc. 137, 10276–10281 (2015).
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B. Conings, J. Drijkoningen, N. Gauquelin, A. Babayigit, J. D’Haen, L. D’Olieslaeger, A. Ethirajan, J. Verbeeck, J. Manca, E. Mosconi, F. Angelis, and H. Boyen, “Intrinsic thermal instability of methylammonium lead trihalide perovskite,” Adv. Energy Mater. 5, 1500477 (2015).
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L. Lv, Y. Xu, H. Fang, W. Luo, F. Xu, L. Liu, B. Wang, X. Zhang, D. Yang, W. Hu, and A. Dong, “Generalized colloidal synthesis of high-quality, two-dimensional cesium lead halide perovskite nanosheets and their applications in photodetectors,” Nanoscale 8, 13589–13596 (2016).
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Dong, H.

Y. Chen, M. Zheng, Y. Xiao, H. Dong, H. Zhang, J. Zhuang, H. Hu, B. Lei, and Y. Liu, “A self-quenching resistant carbon-dot powder with tunable solid-state fluorescence and construction of dual-fluorescence morphologies for white light-emission,” Adv. Mater. 28, 312–318 (2016).
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Q. Dong, Y. Fang, Y. Shao, P. Mulligan, J. Qiu, L. Cao, and J. Huang, “Electron–hole diffusion lengths >175  μm in solution-grown CH3NH3PbI3 single crystals,” Science 347, 967–970 (2015).
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Dong, Y.

J. Li, L. Xu, T. Wang, J. Song, J. Chen, J. Xue, Y. Dong, B. Cai, Q. Shan, B. Han, and H. Zeng, “50-fold EQE improvement up to 6.27% of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand,” Adv. Mater. 29, 1603885 (2017).
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J. Song, L. Xu, J. Li, J. Xue, Y. Dong, X. Li, and H. Zeng, “Monolayer and few-layer all-inorganic perovskites as a new family of two-dimensional semiconductors for printable optoelectronic devices,” Adv. Mater. 28, 4861–4869 (2016).
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F. Zhang, H. Zhong, C. Chen, X. Wu, X. Hu, H. Huang, J. Han, B. Zou, and Y. Dong, “Brightly luminescent and color tunable colloidal CH3NH3PbX3(X = Br, I, Cl) quantum dots: potential alternatives for display technology,” ACS Nano 9, 4533–4542 (2015).
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X. Tang, Z. Hu, W. Yuan, W. Hu, H. Shao, D. Han, J. Zheng, J. Hao, Z. Zang, and J. Du, “Perovskite CsPb2Br5 microplate laser with enhanced stability and tunable properties,” Adv. Opt. Mater. 5, 1600788 (2017).
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Y. Zhang, J. Du, X. Wu, G. Zhang, Y. Chu, D. Liu, Y. Zhao, Z. Liang, and J. Huang, “Ultrasensitive photodetectors based on island-structured CH3NH3PbI3 thin films,” ACS Appl. Mater. Interfaces 7, 21634–21638 (2015).
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Y. Bekenstein, B. Koscher, S. Eaton, P. Yang, and A. Alivisatos, “Highly luminescent colloidal nanoplates of perovskite cesium lead halide and their oriented assemblies,” J. Am. Chem. Soc. 137, 16008–16011 (2015).
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D. Zhang, S. Eaton, Y. Yu, L. Dou, and P. Yang, “Solution-phase synthesis of cesium lead halide perovskite nanowires,” J. Am. Chem. Soc. 137, 9230–9233 (2015).
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S. Stranks, G. Eperon, G. Grancini, C. Menelaou, M. Alcocer, T. Leijtens, L. Herz, A. Petrozza, and H. Snaith, “Electron–hole diffusion lengths exceeding 1 micrometer in an organometal trihalide perovskite absorber,” Science 342, 341–344 (2013).
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Ethirajan, A.

B. Conings, J. Drijkoningen, N. Gauquelin, A. Babayigit, J. D’Haen, L. D’Olieslaeger, A. Ethirajan, J. Verbeeck, J. Manca, E. Mosconi, F. Angelis, and H. Boyen, “Intrinsic thermal instability of methylammonium lead trihalide perovskite,” Adv. Energy Mater. 5, 1500477 (2015).
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A. Pan, B. He, X. Fan, Z. Liu, J. Urban, A. Alivisatos, L. He, and Y. Liu, “Insight into the ligand-mediated synthesis of colloidal CsPbBr3 perovskite nanocrystals: the role of organic acid, base, and cesium precursors,” ACS Nano 10, 7943–7954 (2016).
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L. Lv, Y. Xu, H. Fang, W. Luo, F. Xu, L. Liu, B. Wang, X. Zhang, D. Yang, W. Hu, and A. Dong, “Generalized colloidal synthesis of high-quality, two-dimensional cesium lead halide perovskite nanosheets and their applications in photodetectors,” Nanoscale 8, 13589–13596 (2016).
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Q. Dong, Y. Fang, Y. Shao, P. Mulligan, J. Qiu, L. Cao, and J. Huang, “Electron–hole diffusion lengths >175  μm in solution-grown CH3NH3PbI3 single crystals,” Science 347, 967–970 (2015).
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F. Palazon, S. Dogan, S. Marras, F. Locardi, I. Nelli, P. Rastogi, M. Ferretti, M. Prato, R. Krahne, and L. Manna, “From CsPbBr3 nano-inks to sintered CsPbBr3–CsPb2Br5 films via thermal annealing: implications on optoelectronic properties,” J. Phys. Chem. C 121, 11956–11961 (2017).
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S. Yakunin, L. Protesescu, F. Krieg, M. Bodnarchuk, G. Nedelcu, M. Humer, G. Luca, M. Fiebig, W. Heiss, and M. Kovalenko, “Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of cesium lead halide perovskites,” Nat. Commun. 6, 8056 (2015).
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X. Zhang, B. Xu, J. Zhang, Y. Gao, Y. Zheng, K. Wang, and X. Sun, “All-inorganic perovskite nanocrystals for high-efficiency light emitting diodes: dual-phase CsPbBr3–CsPb2Br5,” Adv. Funct. Mater. 26, 4595–4600 (2016).
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S. Eatona, M. Laia, N. Gibsona, A. Wonga, L. Dou, J. Ma, L. Wang, S. Leonea, and P. Yang, “Lasing in robust cesium lead halide perovskite nanowires,” Proc. Natl. Acad. Sci. USA 113, 1993–1998 (2016).
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F. Zhang, H. Zhong, C. Chen, X. Wu, X. Hu, H. Huang, J. Han, B. Zou, and Y. Dong, “Brightly luminescent and color tunable colloidal CH3NH3PbX3(X = Br, I, Cl) quantum dots: potential alternatives for display technology,” ACS Nano 9, 4533–4542 (2015).
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ACS Appl. Mater. Interfaces (4)

F. Wang, J. Mei, Y. Wang, L. Zhang, H. Zhao, and D. Zhao, “Fast photoconductive responses in organometal halide perovskite photodetectors,” ACS Appl. Mater. Interfaces 8, 2840–2846 (2016).
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ACS Nano (4)

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F. Zhang, H. Zhong, C. Chen, X. Wu, X. Hu, H. Huang, J. Han, B. Zou, and Y. Dong, “Brightly luminescent and color tunable colloidal CH3NH3PbX3(X = Br, I, Cl) quantum dots: potential alternatives for display technology,” ACS Nano 9, 4533–4542 (2015).
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Y. Chen, M. Zheng, Y. Xiao, H. Dong, H. Zhang, J. Zhuang, H. Hu, B. Lei, and Y. Liu, “A self-quenching resistant carbon-dot powder with tunable solid-state fluorescence and construction of dual-fluorescence morphologies for white light-emission,” Adv. Mater. 28, 312–318 (2016).
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J. Li, L. Xu, T. Wang, J. Song, J. Chen, J. Xue, Y. Dong, B. Cai, Q. Shan, B. Han, and H. Zeng, “50-fold EQE improvement up to 6.27% of solution-processed all-inorganic perovskite CsPbBr3 QLEDs via surface ligand,” Adv. Mater. 29, 1603885 (2017).
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Adv. Sci. (1)

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Chem. Commun. (1)

G. Li, H. Wang, Z. Zhu, Y. Chang, T. Zhang, Z. Song, and Y. Jiang, “Shape and phase evolution from CsPbBr3 perovskite nanocubes to tetragonal CsPb2Br5 nanosheets with an indirect bandgap,” Chem. Commun. 52, 11296–11299 (2016).
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Nanoscale (1)

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Science (3)

W. Nie, H. Tsai, R. Asadpour, J. Blancon, A. Neukirch, G. Gupta, J. Crochet, M. Chhowalla, S. Tretiak, M. Alam, H. Wang, and A. Mohite, “High-efficiency solution-processed perovskite solar cells with millimeter-scale grains,” Science 347, 522–525 (2015).
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Figures (7)

Fig. 1.
Fig. 1.

Study of the influence of reaction temperature on CsPb2Br5 NPLs. (a)–(c) SEM images, (d)–(f) AFM topography images, and (g)–(i) line profiles of layers.

Fig. 2.
Fig. 2.

Morphology and EDS of an individual CsPb2Br5 NPL synthesized at 140°C. (a) TEM image and (b) HRTEM image. (c)–(f) Element mapping and (g) EDS spectrum.

Fig. 3.
Fig. 3.

(a) XRD pattern. (b) Crystal structures of CsPb2Br5 and CsPbBr3. (c) PL and UV–vis absorption spectra. (d) PL decay traces of CsPb2Br5 NPLs.

Fig. 4.
Fig. 4.

(a) Schematic of LEDs coated with CsPb2Br5 NPLs. (b) Emission spectra and (c) chromaticity coordinate variations of LEDs coated with different amount of CsPb2Br5 NPLs. (d) Emission spectra and (e) chromaticity coordinates of coated LEDs under different driving currents. The inset shows photographs of coated LEDs without and with injection current.

Fig. 5.
Fig. 5.

(a) IV curve of bare LEDs and coated LEDs. (b) Variation of FWHM and emission peak of coated LEDs under different injection currents. Luminous flux and luminous efficiency of (c) bare LEDs and (d) coated LEDs.

Fig. 6.
Fig. 6.

(a) Schematic diagram of the fabricated photodetector device. (b) SEM image and (c) magnified SEM image of the device. (d) Band profile of the CsPb2Br5 NPL photodetector. (e)–(g) Current–voltage (IV) characteristics of CsPb2Br5 NPL photodetectors without and with incident light of 405 nm by changing the bias voltage from 10 to 10 V.

Fig. 7.
Fig. 7.

(a), (c), and (e) Current–time (IT) curves of the photodetectors. (b), (d), and (f) Rise times and the decay times of the photodetectors with incident light of 405 nm at the bias of 6 V.

Tables (2)

Tables Icon

Table 1. Lifetimes and PLQYs of CsPb2Br5 NPLs Synthesized at Different Temperatures

Tables Icon

Table 2. Performances of CsPb2Br5 NPL Photodetectors

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

I(t)=A1exp(t/τ1)+A2exp(t/τ2),
τave=(A1τ12+A2τ22)/(A1τ1+A2τ2).

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