ACS Applied Nano Materials
·
2023
·
IF 5.9
Ru-Kun Ding,Xiao-Song Zhang,Long Liu,Xiao-Kai Gong,Zhao-Wei Zhang,Qian Li,Liu Pei,Lan Li,Jian-Ping Xu
Lead halide perovskites have garnered widespread attention because of their excellent photoelectric and photonic properties. However, their material fabrications and optoelectronic applications are hindered by low stability. Nanoriveted structure perovskites with high stability and long afterglow dual-wavelength emission are synthesized using a shared ion strategy of perovskites and phosphors. The CsPbBr3/CsCaAl2O4:Nd,Er nanoriveted structure perovskites exhibit dual-wavelength emission of blue and green during photoexcitation, as well as a prolonged afterglow. The fabricated flexible electroluminescent devices have spectrally tunable and dual-wavelength emissions even at 60° bending. Because the CsPbBr3 quantum dots (QDs) capture the photon emitted from Er element, the electroluminescent devices retain observable dual-wavelength emissions and high synchronization in their afterglow, which decays after the removal of power. The CsPbBr3/CsCaAl2O4:Nd,Er nanoriveted structure perovskites can also be used as the light-emitting downshift layers to improve the performance of photovoltaic modules in photovoltaic devices. At cryogenic temperatures, the temperature-dependent photoluminescence spectra test reveals the energy transfer between CsPbBr3 QDs and CsCaAl2O4:Nd,Er (contradicts the energy transfer in the afterglow state). These discoveries overcome the limitations of conventional afterglow phosphors, provide new applications for long afterglow materials, and introduce an innovative approach to energy conservation.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yuechan Li,Xiaolu Yang,An Xie
Lead halide perovskite CsPbBr 3 nanocrystals (NCs) have attracted great interest in recent years owing to their excellent properties such as strong light absorption , high photoluminescence quantum yield (PLQY), good wavelength tunability, and narrow FWHM. However, their instability is still a bottleneck for their potential application. In this work, a pseudo-peritectic method, which is a peritectic reaction in solutions, was proposed. The phenomenon of “Survival of the fittest” was observed. The synthesized CsPb 2 Br 5 phase greatly reduces the surface defects , and improves the stability and PL properties. The pseudo-peritectic method using for preparing surface modified CsPbBr 3 @CsPb 2 Br 5 nanocrystals is a significant pathway to achieve long-term stable lead halide perovskite for optoelectronic devices .
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 17
·10023-10029
·
IF 3.119
Yunwei Wei,Wei Zheng,Malik Zeeshan Shahid,Zhixiang Jiang,Yuehua Li,Zhongyao Duan,Guangning Liu,Xun Hu,Cuncheng Li
Compared with nanoscale quantum dots (QDs), the large-sized perovskite crystals not only possess better stability but also are convenient for application exploration. Herein, we develop a facile and efficient antisolvent vapor-assisted recrystallization approach for the synthesis of large-sized Cs4PbBr6 perovskite crystal microplates. In this method, for the first time, the shale-like Cs4PbBr6 microplates with lateral dimensions of hundreds of microns are fabricated by employing cetyltriethylammnonium bromide (CTAB) as a morphology-directing agent. FESEM, TEM, and AFM characterizations indicate that the as-obtained shale-like Cs4PbBr6 microplates are actually formed by 6–8 nm thick Cs4PbBr6 nanosheets with orientational stacking. Importantly, such highly crystalline Cs4PbBr6 microplates with shale-like morphology exhibit a narrow and intense green PL emission with a 59% PL quantum yield. Moreover, the planar structure of shale-like Cs4PbBr6 microplates makes it easy to form a preferred orientation on a substrate, which endow them with promising potential in optoelectronic devices such as lighting and displays.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kun Nie,Xiaodong Zhang,Xiaoman Zhang,Xueliang Zhang,Luoxin Wang,Jing Xu,Lefu Mei,Hua Wang
All-inorganic lead-free double perovskites have great application potential due to their unique crystal structure and low toxicity. Among them, the shortcomings of indirect band gap and inhibiting transition in some lead-free double perovskites reduce their optical performance. In this study, the facile method at low temperature and atmospheric pressure was used to prepare a high-efficiency green-emitting Sc 3+ -doped Cs 2 NaTbCl 6 . The synthesized Cs 2 NaTbCl 6 and Sc 3+ -doped Cs 2 NaTbCl 6 perovskite crystals had similar crystal structures. Interestingly, Sc 3+ -doped Cs 2 NaTbCl 6 could improve the luminescence performance of Cs 2 NaTbCl 6 while maintaining the excitation-emission characteristics of Cs 2 NaTbCl 6 . After doping with Sc 3+ at a concentration of 0.05 mmol, the band gap of Cs 2 NaTbCl 6 became wider. When the doping amount of Sc 3+ reached 0.05 m mol, the photoluminescence emission intensity was increased by 31.33 % compared with Cs 2 NaTbCl 6 . The fluorescence lifetime became longer and the photoluminescence quantum yield reached 96.07 %. In this work, we further prepared light-emitting diodes and white light-emitting diodes with excellent performance using Sc 3+ -doped Cs 2 NaTbCl 6 . In addition, Sc 3+ -doped Cs 2 NaTbCl 6 and aramid chopped fibers/polyphenylene sulfide were combined to prepare the composite paper. The functional composite fiber paper had excellent photostability in a variety of extreme environments. The potential application value of Sc 3+ -doped Cs 2 NaTbCl 6 double perovskite in daily lighting, color display, fluorescent anti-counterfeiting, functional fibers, and optoelectronic devices was demonstrated.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Xing Chenyu,Chen Gaoyu,Zhu Xia,An Jiakun,Bao Jianchun,Wang Xuan,Zhou Xiuqing,Du Xiuli,Xu Xiangxing
Carbon dots (CDs) have wide application potentials in optoelectronic devices, biology, medicine, chemical sensors, and quantum techniques due to their excellent fluorescent properties. However, synthesis of CDs with controllable spectrum is challenging because of the diversity of the CD components and structures. In this report, machine learning (ML) algorithms were applied to help the synthesis of CDs with predictable photoluminescence (PL) under the excitation wavelengths of 365 and 532 nm. The combination of precursors was used as the variable. The PL peaks of the strongest intensity ( λ s ) and the longest wavelength ( λ l ) were used as target functions. Among six investigated ML models, the random forest (RF) model showed outstanding performance in the prediction of the PL peaks.
研究领域:
材料科学
·
化学
·
光电技术
·
生物学
·
医学
·
量子技术
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2017
·
IF 0.835
Yu Wang,Yue Yang,Peng Wang,Xue Bai
The concentration and temperature dependence of photoluminescence (PL) performance was investigated, which indicated that the main emission in CsPbBr 3 perovskite quantum dots was related to the band-edge mechanism. As the concentration increased from 0.1 to 10.0 mol/L at 293 K, the center of emission band exhibited a regular redshift, as well as the peak intensity increased initially and then declined, which could be attributed to the self-absorption processes. Along with the variation of temperature (273–353 K), peak wavelength, full width of half maximum (FWHM), and peak intensity of PL spectra presented a corresponding linear changes. In addition, the temperature reversibility revealed that CsPbBr 3 QDs were reliable candidates for temperature sensor and optoelectronic devices .
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jindou Shi,Minqiang Wang,Chen Zhang,Junnan Wang,Yun Zhou,Youlong Xu,Nikolai V. Gaponenko,Arshad Saleem Bhatti
Lead-free double perovskites (DP) have the potential to become a rising star in the next generation of lighting markets by addressing the toxicity and instability issues associated with traditional lead-based perovskites. However, high concentrations of hydrochloric acid (HCl) were often employed as a solvent in the preparation of most DPs, accompanied by slow crystallization at high temperatures, which not only raised the risk and cost in the preparation process, but also had a potential threat to the environment. Here, an in situ fabrication strategy was proposed to realize the crystallization of DP in the polymer at low temperature with a mild dimethyl sulfoxide (DMSO) solvent, and subsequently obtained optically well-behaved Cs2Na0.8Ag0.2BiCl6/PMMA composite films (CFs) by doping with Ag+, generating bright orange luminescence with a photoluminescence quantum yield (PLQY) of up to 21.52%. Moreover, the growth dynamics of Cs2Na0.8Ag0.2BiCl6/PMMA CFs was further investigated by in situ optical transformation, which was extended to other DP-based polymer CFs. Finally, these CFs exhibited excellent performance in optoelectronic devices and anticounterfeit printing, the results of which provide a new pathway to advance the development of lead-free DP materials in the optical field.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2020
·Vol. 14
·期 3
·332-340
·
IF 1.747
Wang Wei,Gong Jinhui,Guo Siyu,Jiang Lin,Liu Shaochao,Wang Li
Low-dimensional halide perovskites (HPs) have received considerable attention in recent years due to their novel physical properties such as compositional flexibility, high quantum yield, quantum size effects and superior charge transport. Here we show room temperature solution synthesis of 1D organic-inorganic lead bromide perovskite microwires (MWs). Our method uses acetone as a reactant, and when CH 3 NH 3 PbBr 3 is immersed, acetone reacts with CH 3 NH 3 + cations in the CH 3 NH 3 PbBr 3 single crystal by the dehydration condensation. The reaction generates a large (CH 3 ) 2 C = NHCH 3 + A-site which cannot be accommodated by the cuboctahedron formed by the corner-sharing [PbBr 6 ] 4− octahedral, leading to the transition of corner-sharing octahedra to face-sharing triangular prism and the crystal structure transformation from 3D to 1D. The formation process of (CH 3 ) 2 C = NHCH 3 PbBr 3 MWs does not involve any ligands, templates or catalysts. A two-terminal memory device was constructed using the (CH 3 ) 2 C = NHCH 3 PbBr 3 MWs, showing great potential of the method in fabrication of electronic and optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 15
·8430-8436
·
IF 3.361
Ronghua Wu,Zhongchen Bai,Jinguo Jiang,Heng Yao,Shuijie Qin
CsPbX3 (X = Cl, Br, and I) quantum dots (QDs) and Cu2+-doped CsPbCl3 QDs with different Cu-to-Pb molar ratios were synthesized via a solvent-based thermal synthesis method. The photoluminescence (PL) properties of these Cu2+-doped CsPbCl3 QDs were also investigated in this study. The results showed that with the increase in the Cl− concentration the surface defects of CsPb(Cl/Br)3 QDs increased, which resulted in an increase in the non-radiative recombination of excitons and weakened the PL intensity. Moreover, Cu2+-doped CsPbCl3 QDs maintained the cubic crystal structure of the initial phases. Owing to the doping of Cu2+ ions, the surface defects of CsPbCl3 QDs were effectively eliminated, which facilitated the excitonic recombination via a radiative pathway. The PL quantum yields (PLQYs) of Cu2+-doped CsPbCl3 QDs were increased to 51%, showing great photostability. From the results, it is believed that Cu:CsPbCl3 QDs can be widely used in optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
DOI
PubMed
高影响因子
ChemNanoMat
·
2019
·Vol. 6
·期 2
·258-266
·
IF 3.431
Yunwei Wei,Ruijia Sun,Yuehua Li,Yuhai Zhang,Yizhong Lu,Xiaoming Li,Guozhu Chen,Bingqiang Cao,Cuncheng Li,Haibo Zeng
The preparation of luminescent Cs 4 PbBr 6 perovskite solids with current methods either needs a complex procedure, or needs a variety of ligands, and a combination of good solvents and anti-solvents. The potential environmental risks are inevitable when they are produced in large scale. Herein, an environmentally friendly route for the mass production of luminescent Cs 4 PbBr 6 perovskite solids using a single solvent under ambient conditions is presented. Gram-scale Cs 4 PbBr 6 perovskite solids are produced within tens of minutes using a small amount of DMF, specifically, 4 mL DMF solution can produce over 10 g products per batch. Because no ligands and anti-solvents are utilized in the whole procedures, the ligand-free Cs 4 PbBr 6 perovskite solids are facilely harvested after the evaporation of solvent. More importantly, the solvent vapor can be recovered and reutilized, which can eliminate the environmental pollution caused by organic solvent. The experimental results revealed that the solvent, reaction time, and PbBr 2 /CsBr molar ratios are crucial for the formation of Cs 4 PbBr 6 perovskite solids and their luminescent performances. Such Cs 4 PbBr 6 perovskite solids exhibit strong green PL emission, high PL quantum yield and reversible fluorescent response towards heat and light, which enable them to be suitable for applications in optoelectronic devices.
研究领域:
材料科学
·
化学
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 10
·1655
·
IF 5.3
Duanqi Ma,Yanlin Xu,Qiuying Chen,Huafeng Ding,Xiaoming Tan,Qinfeng Xu,Chuanlu Yang
Mixed-halide perovskite quantum dots (PeQDs) are the most competitive candidates in designing solar cells and light-emitting devices (LEDs) due to their tunable bandgap and high-efficiency quantum yield. However, phase separation in mixed-halide perovskites under illumination can form rich iodine and bromine regions, which change its optical responses. Herein, we synthesize PeQDs combined with mesoporous zinc-based metal organic framework (MOF) crystals, which can greatly improve the stability of anti-anion exchange, including photo-, thermal, and long-term stabilities under illumination. This unique structure provides a solution for improving the performance of perovskite optoelectronic devices and stabilizing mixed-halide perovskite devices.Keywords:mixed-halide perovskite quantum dots;phase separation;metal organic framework
研究领域:
材料科学
·
纳米技术
·
光电
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2019
·Vol. 31
·期 42
·1903830
·
IF 25.809
Sheng Huang,Peng Huang,Lei Wang,Junbo Han,Yu Chen,Haizheng Zhong
3D perovskites with typical structure of ABX 3 are emerging as key materials to achieve high-performance optoelectronic devices. The variation of A-site cation is promising to achieve enhanced properties; however, is limited to a few available choices of methylamine, formamidine, and cesium. In this work, halogenated-methylammoniums are developed as A cation to broaden the family of hybrid perovskites. Single crystals and colloidal nanocrystals of halogenated-methylammoniums based perovskites are successfully synthesized, showing bright future as alternatives for device exploration. In particular, the improved thermal stability and low exciton binding energy from single crystals measurements are demonstrated and bright tunable emission from blue to green for colloidal nanocrystals is achieved.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）