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Zhou Y, Zou C, Peng D, Jin B, Rao M, Lan D, Yang D, Di D, Zhang X. Reduced-Toxicity and Highly Luminescent Germanium-Lead Perovskites Enabled by Strain Reduction for Light-Emitting Diodes. J Phys Chem Lett 2024; 15:6443-6450. [PMID: 38865492 DOI: 10.1021/acs.jpclett.4c01478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
Germanium-lead (Ge-Pb) perovskites provide a promising solution for perovskite optoelectronic devices with reduced toxicity. However, Ge-Pb perovskite light-emitting diodes (PeLEDs) with >30 mol % Ge showed low emission efficiencies [Yang, D.; Zhang, G.; Lai, R.; Cheng, Y.; Lian, Y.; Rao, M.; Huo, D.; Lan, D.; Zhao, B.; Di, D. Germanium-Lead Perovskite Light-Emitting Diodes. Nat. Commun. 2021, 12 (1), 4295]. Here, we apply strain engineering to effectively improve the light emission efficiency and stability of Ge-Pb perovskite films and PeLEDs with 30 and 60 mol % Ge, through A-site modulation. The maximum external quantum efficiencies of the Ge-Pb PeLEDs with 30 and 60 mol % Ge are 8.5% and 3.0% at 3.32 mA cm-2 (∼922 cd m-2) and 0.53 mA cm-2 (∼60 cd m-2), respectively. Time-resolved transient absorption spectroscopy analysis of Ge-Pb perovskite films on different hole-transport layers shows that incorporating 30 mol % Ge into the perovskite with mixed A-site cations can effectively suppress trap-assisted recombination. Further analysis of their current density-voltage (J-V) curves reveals the efficiency loss mechanisms of Ge-Pb PeLEDs with high Ge fractions, indicating the possibility of further improvements.
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Affiliation(s)
- Yanjun Zhou
- Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Chen Zou
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Dingkun Peng
- College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Bangwei Jin
- Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Min Rao
- Institute of Flexible Electronics (IFE), Northwestern Polytechnical University (NPU), Xi'an 710072, China
| | - Dongchen Lan
- College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
- Australian Centre for Advanced Photovoltaics, University of New South Wales, Sydney 2052, Australia
| | - Dexin Yang
- Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom
| | - Dawei Di
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China
| | - Xuefeng Zhang
- Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
- Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
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Zhang S, Li Z, Fang Z, Qiu B, Pathak JL, Sharafudeen K, Saravanakumar S, Li Z, Han G, Li Y. A high-performance metal halide perovskite-based laser-driven display. MATERIALS HORIZONS 2023; 10:3499-3506. [PMID: 37255034 DOI: 10.1039/d3mh00507k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Laser-driven liquid crystal displays (LCDs) comprising metal halide perovskites (MHPs) as the blue-to-green/red color converters are at the forefront of ongoing intense research on the development and improvement of display devices. However, the inferior high photoluminescence quantum yield (PLQY) of MHPs under the excitation of high-power blue light and photoluminescence deterioration at high temperatures remain major concerns. Herein, we design a kind of octylamine-modified MHP via binding energy engineering, and the synthesized materials show PLQY of 97.6% under the excitation of a blue laser at 450 nm. Meanwhile, this design endows a structural self-healing ability to achieve a high PLQY and luminescence stability under high temperature (90 °C) and high flux excitation (386 mW cm-2). The blue light-excitable MHPs with a near unity PLQY, strong stability, and low PLQY deterioration are further encapsulated into a laser-driven LCD device. This prototype demonstrates excellent color gamut (132% NTSC, 98% Rec. 2020), illuminance intensity (>10 000 lux), and energy consumption (47.5% of commercial consumption), and hence is expected to be beneficial for the reduction of energy consumption in backlight display devices, particularly in large-screen outdoor displays.
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Affiliation(s)
- Shaoan Zhang
- Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211, China
- School of Biomedical Engineerings, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.
- School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China
| | - Zhenzhang Li
- Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211, China
- School of Biomedical Engineerings, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.
- School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China
| | - Zaijin Fang
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 511443, China
| | - Bao Qiu
- Ningbo Institute of Materials Technology & Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
| | - Janak L Pathak
- School of Biomedical Engineerings, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.
| | | | - S Saravanakumar
- Department of Physics, Kalasalingam University, Krishnan Koil, Viridhunagar, 626126, Tamil Nadu, India
| | - Zhanjun Li
- School of Biomedical Engineerings, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.
| | - Gang Han
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Massachusetts, Worcester, 01605, USA.
| | - Yang Li
- Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211, China
- School of Biomedical Engineerings, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.
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Bai T, Wang S, Zhang K, Chu C, Sun Y, Yi L. High stability and strong luminescence CsPbBr 3-Cs 4PbBr 6 thin films for all-inorganic perovskite light-emitting diodes. RSC Adv 2023; 13:24413-24422. [PMID: 37588973 PMCID: PMC10426272 DOI: 10.1039/d3ra03947a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 08/04/2023] [Indexed: 08/18/2023] Open
Abstract
All-inorganic lead halide perovskite, characterized by its exceptional optical and electrical properties, is burgeoning as a potential optoelectronic material. However, the standalone CsPbBr3 component encounters several challenges including small exciton binding energy (≈40 meV) and long charge diffusion length, giving rise to low photo-luminescence quantum-yield (PLQY); ion migration leads to instability in device operation, hindering device operation and potential development. To circumvent these limitations, our research endeavors to construct a novel core-shell structure that transforms the continuous [PbX6]4- octahedron into an isolated octahedral structure. We introduce the Cs4PbBr6 phase with 0D structure to passivate the vacancy defects in CsPbBr3, thereby suppressing ion migration and enhancing the luminescence intensity and stability. Our methodology involves fabricating dense CsPbBr3-Cs4PbBr6 composite films using a co-evaporation method, wherein the molar ratio of CsBr and PbBr2 is precisely adjusted. The films are subsequently rapidly annealed under ambient air conditions, and the effects of different annealing temperatures and annealing times on the CsPbBr3-Cs4PbBr6 films were investigated. Our results demonstrate significantly improved stability of the annealed films, with a mere 15% decrease in PL intensity after 100 days of storage under ambient air conditions at 48% relative humidity (RH). Based on this thin film, we fabricated all-inorganic structure Ag/N-Si/CsPbBr3-Cs4PbBr6/NiO/ITO light emitting diodes (LEDs), the devices have a low turn-on voltage VT ∼3 V and under unencapsulated, ambient air conditions, it can operate continuously for 12 hours under DC drive with only 10% attenuation. The results we obtained open up the possibility of designing and developing air-stable perovskite LEDs.
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Affiliation(s)
- Tianxinyu Bai
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
| | - Shenwei Wang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
| | - Kexin Zhang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
| | - Chunyang Chu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
| | - Yingqiang Sun
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
| | - Lixin Yi
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University Beijing 100044 China
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Wang D, Nie Y, Wang P, Ma Q. In situ synthesis of Cu nanoclusters/CeO 2 nanorod as aggregated induced ECL probe for triple-negative breast cancer detection. Talanta 2023; 258:124400. [PMID: 36889189 DOI: 10.1016/j.talanta.2023.124400] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023]
Abstract
Cu nanoclusters (NCs) have attracted a lot of attention due to the excellent properties. However, the low luminescence and poor stability limited the Cu NC-based sensing research. In this work, Cu NCs were in situ synthesized on CeO2 nanorods. On the one hand, the aggregated induced electrochemiluminescence (AIECL) of Cu NCs has been observed on the CeO2 nanorods. On the other hand, the substrate of CeO2 nanorods acted as catalysis, which reduced the excitation potential and further enhanced the ECL signal of Cu NCs. It was noticed that CeO2 nanorods also greatly improved the stability of Cu NCs. The resulted high ECL signals of Cu NCs can be kept constant for several days. Furthermore, MXene nanosheets/Au NPs has been employed as electrode modification materials to construct the sensing platform to detect miRNA-585-3p in triple negative breast cancer tissues. Au NPs@MXene nanosheets not only enlarged the specific interface area of the electrodes and the number of reaction sites, but also modulated electron transfer to amplify the ECL signal of Cu NCs. The biosensor had a low detection limit (0.9 fM) and a wide linear range (1 fM to 1 μM) for the detection of miRNA-585-3p in the clinic tissues.
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Affiliation(s)
- Dongyu Wang
- Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Yixin Nie
- Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Peilin Wang
- Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Qiang Ma
- Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
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