JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hong Zhu,Chengdong Peng,Jiayi Li,Xuanyu Cao,Yuexiao Pan
The anion-exchange among halogen ions is an effective technique for tuning the chemical composition and emission color of all-inorganic halide perovskite CsPbX 3 (X = Cl, Br, and I) nanocrystals by tailoring their bandgaps. This work is focused on the rate of the reversible anion-exchange through finely tuning the luminescence color of perovskite nanocrystals (NCs) in any region between red and green. The luminescence color of the perovskite CsPb(I 1-x Br x ) 3 (0 ≤ x ≤ 1) has been finely tuned through tailoring its bandgap with the anion-exchange between CsPbI 3 and 4-bromo-butyric acid (BBA) instead of introducing of bromide salts as starting materials. The BBA could serve as triple functions to afford Br − ions source, short chain ligand with carboxyl group for surface passivation , and weak acid. A systematic study has been carried out to elucidate the effect of experimental parameters, on the color rangeability of the NCs and the anion-exchange rate between CsPbI 3 and BBAThe trace of water added into the system can hinder the spontaneous transformation from red CsPbI 3 to CsPbBr 3 with aging time. It is particularly valuable to realize the reversible processes from green to yellow and finally to red successively by increasing the concentration of the isolated I − ions from various inorganic iodides.
研究领域:
材料科学
·
化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Licheng Yu,Youchao Wei,Yuanchao Lei,Yongsheng Liu,Maochun Hong
Inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, or I) perovskite nanowires (NWs) are promising materials for investigating charge transfer and carrier dynamics at the nanoscale level. However, the synthesis of CsPbX 3 NWs with well-defined cubic phases and the desirable properties remains challenging. In this study, we successfully synthesized uniform-diameter cubic-phase CsPbBr 3 NWs with favorable properties via trace Ca 2+ doping. By combining experimental results with first-principles calculations, we confirmed that Ca 2+ doping not only induces lattice distortion in cubic-phase CsPbBr 3 nanocubes, triggering dipole moments that drive self-assembly into single-crystalline NWs via oriented attachment but also inhibits the formation of surface defects and significantly modulates the exciton relaxation kinetics by reducing nonradiative recombination, thus enhancing the photoluminescence efficiency and stability of perovskite NWs with high crystallinity . Furthermore, by exploiting the high plasticity of the CsPbX 3 lattice, we demonstrated the ability to tune the composition and emission color of the NWs through anion exchange reactions while preserving their morphology and crystal structure. These findings provide a stable platform for preparing highly efficient perovskite materials with satisfactory optoelectronic properties for use in prospective photovoltaic and optoelectronic devices.
研究领域:
材料科学
·
光学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yuxin Zong,Taiqun Yang,Pan Hao,Bingqian Shan,Bo Peng,Xiaodan Hu,Ran Tao,Xinqing Chen,Peng Wu,Kun Zhang
Cesium lead halide-based perovskite (CsPbX 3 , X = Cl, Br, I) nanoparticles (NPs) have received considerable attention for their outstanding photophysical properties and promising applications in optoelectronic devices. However, the optoelectronic performance of CsPbX 3 NPs synthesized by most of present strategies are susceptible to external factors when exposed in atmosphere. Herein, benefiting from the unique open 3D porous architecture of dendritic mesoporous silica nanospheres (DMSNs) with cage-like spherical nanopores , highly dispersed and pure cubic CsPbX 3 NPs were successfully immobilized onto the mesoporous networks. A strategy of combining chemical anchoring and spatial isolation is designed for the one-pot synthesis of CsPbX 3 NPs. These as-fabricated CsPbX 3 @HA-DMSNs exhibit excellent luminescence property (tunable emission color and high quantum yield (QY reached a maximum of 55%)) and enhanced stability (especially for the water resistance capacity). The photoluminescence (PL) was sustained without any distinct change after 100 d storage under ambient conditions, even 90% PL intensity was maintained after continuous UV irradiation for 45 h and no obvious PL reduction was observed when soaked in water for 7 h. Most importantly, the resulting CsPbX 3 @HA-DMSNs could be easily purified by filtration without aggregation and easy to scale up production compared with the conventional solution-phase mediated synthesis, which provides an alternative for the effective fabrication of perovskite-based devices, for example, here, the white light emitting devices (LEDs).
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yujie Cao,Fei Gao,Yaqian Yuan,Runchi Wang,Shu Xu,Chong Geng
Cesium lead halide perovskite nanocrystals (IPNCs) exhibit excellent optoelectronic properties but are susceptible to degradation in practical environments due to their ionic surface and unstable ligand capping. Here, we propose a post-synthesis surface passivation strategy for CsPbX 3 (X = Br, I) IPNCs by employing combined zinc halide and zinc phenylbutyrate (Zn(PA) 2 ) as surface ligands. ZnBr 2 fills surface halide vacancies on IPNCs, resulting in high photoluminescence efficiency, whereas Zn(PA) 2 stabilizes IPNCs by substituting surface ammonium ligands. Additionally, the −PA capping endows IPNCs with high solubility in polystyrene (PS), enabling the direct fabrication of highly efficient and uniform IPNCs-PS color conversion films through in situ polymerization of the IPNC-styrene solution. The resulting IPNCs-PS films displayed significantly enhanced stability, retaining excellent PL persistence after 1000 h of photoaging. This novel ligand and modification method presents a promising strategy for improving the efficiency and stability of IPNCs, facilitating their potential applications in display backlight and other optoelectronic applications.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 35
·1903155
·
IF 15.621
Chun-Ta Wang,Keqiang Chen,Ping Xu,Fion Yeung,Hoi-Sing Kwok,Guijun Li
Halide perovskites have received tremendous attention due to their fantastic optical and electrical properties. Here, circularly polarized light emission is successfully demonstrated using a simple configuration consisting of inorganic perovskite nanocrystals embedded within a predefined handedness cholesteric superstructure stack. The helical structured cholesteric liquid crystal film acts as a selective filter to transform the unpolarized light emission from perovskite nanocrystals into circularly polarized luminescence. The transformation is accompanied by an extraordinary dissymmetry factor (| g lum |) up to 1.6, well-defined handedness, high photoluminescence quantum yield, and full-color availability. Furthermore, the circularly polarized luminescence is angular dependent and can easily be modulated by shifting the overlap of the reflection band and the emission band. The proposed method is more straightforward and powerful than the previous approaches, offering new opportunities in optoelectronic and photonic devices.
研究领域:
材料科学
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光学
·
纳米技术
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 5
·3173-3179
·
IF 2.1
Han Ruiyi,Chen Jin,Wang Fengchao,Sun Yu,Hu Yanling,Yang Jing,Zhang Canyun,Kong Jinfang,Li Lan,Wang Haiyan
In this work, a facile solution based on the supersaturated crystallization principle combined with an ion exchange strategy was employed for the preparation of all-inorganic lead halide perovskite CsPbX 3 quantum dots (X = Cl, Br, I, and their combinations) under an ambient atmosphere. As the results showed, with the progression of Br–Cl and Br–I ion exchange, the green emission of pure CsPbBr 3 gradually turned to cyan and blue, yellow, and red, respectively. Thus, the emission featured a broad wavelength range from 472 nm to 638 nm. With regard to the morphology, the as-synthesized quantum dots were all spherical and monodisperse, and the crystal size increased from the blue to the red samples. Furthermore, the chemical composition investigated by energy-dispersive x-ray spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS) confirmed the successful Br–Cl or Br–I ion exchange, and the obtained samples were expressed as CsPbBr 1.9 Cl 1.1 , CsPbBr 2.1 Cl 0.9 , CsPbBr 3 , CsPbBr 1.7 I 1.3 , and CsPbBr 0.9 I 2.1 for blue, cyan, green, yellow, and red samples, respectively. In future work, the as-synthesized samples will be investigated for use in an optoelectronic device application.
研究领域:
材料科学
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化学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 5
·2866-2871
·
IF 3.361
Hui Cheng,Yanfeng Yin,Jianbo Tang,Donghua Fan,Jan J. Huang,Shengye Jin
All-inorganic perovskite materials have emerged as highly promising materials for solar cells and photoelectronic applications. However, the poor stability of perovskites in ambient conditions significantly hampers their practical applications. In this work, we report a three-step synthesis of size tunable CsPbX3 (X = Br, Cl, or I) quantum dots (QDs) embedded in zeolite-Y (CsPbX3-Y), which involves efficient chemical transformation of non-luminescent Cs4PbX6 to highly luminescent CsPbX3 by stripping CsX through an interfacial reaction with water. We show that the size and the emission of CsPbX3 in CsPbX3-Y can be tuned by the amount of water added as well as the halide composition. More importantly, the as-prepared CsPbX3-Y show significantly enhanced stability against moisture upon protection by zeolite-Y. This work not only reports a new pathway for the preparation of highly luminescent CsPbX3 but also provided new insights into the chemical transformation behavior and stabilization mechanism of these emerging perovskites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Meng Li,Xiao Zhang,Yingying Du,Ping Yang
Halide perovskites have attracted enormous attention as a novel optoelectronic material showing bright emission recently. In this paper, we chose CsPbX 3 nanocrystals (NCs) as an example to study the structural, morphological and optical properties . We have synthesized monodispersed colloidal inorganic cesium lead halide perovskites (CsPbX 3 , X = Cl, Br and I, or mixed lead halide CsPb(Cl/Br) 3 and CsPb(Br/I) 3 ) NCs with various morphologies and brightly luminescent properties. The emission wavelength of resulting CsPbX 3 NCs can be tuned from 440 nm to 696 nm by varying the amount of different PbX 2 (X = Cl, Br and I), while maintaining high quantum yields up to 95% and narrow emission spectra . The average lifetime of the NCs is several ns to hundred with changing the composition . The blinking of the NCs in terms of a binary (on/off) process is different from II-VI quantum dots . Interestingly, we find that CsPbBr 3 NCs to Cs 4 PbBr 6 NCs or a mixture of CsPbBr 3 NCs and Cs 4 PbBr 6 NCs were obtained by adjusting the amount of oleic acid (OA)-Cs precursor. The optical properties of these NCs have been controlled by varying their composition. Moreover, the injection speed of Cs-OA precursor enables the control of CsPbI 3 NCs with different morphology, which can be tuned from litter nanoparticles to uniform nanorods . This finding can serve as an ideal platform for the investigation of fundamental properties.
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Lingbin Ye,Yun Gao,Yifeng Feng,Xiaofang Zhu,Zichao Ma,Dingshuo Zhang,Yifan He,Haiping He,Zhizhen Ye,Xingliang Dai
Mixed-halide perovskite light-emitting diodes (PeLEDs) face the critical challenge of field-dependent phase separation. Discrete colloidal CsPbX 3 nanocrystals anchored with ligands are promising to suppress phase separation, yet it remains a mystery how ion migration proceeds when integrated into LEDs as emissive films. Specifically, the influence of ion migration inside a single nanocrystal or across the nanocrystals along the electric field on the performance of PeLEDs needs to be decoupled. Here, a low-temperature-assisted transfer-printing method is developed to construct a model PeLED containing a clear CsPbBr 3 -CsPbI 3 nanocrystal film interface for tracing the ion migration between perovskite nanocrystal films along the direction of electric fields. The comprehensive study demonstrates that halogen ions crossing the nanocrystal film interface lead to severe phase separation and poor device stability, rather than the horizontal intra-layer diffusion. The monolayer CsPbX 3 nanocrystal film prevents the field-dependent phase separation caused by interlayer ion migration, significantly improving electroluminescent stability, including spectrum and lifetime. The optimized structure achieves a high external quantum efficiency of 26.9% and a remarkably improved operational half-lifetime of 61.2 h at an initial luminance of 100 cd m −2 in pure-red PeLEDs based on mixed-halide CsPb(I x /Br 1-x ) 3 , more than 300 times longer than the control device using multilayer nanocrystals.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zhibin Xu,Zhiheng Xu,Sirui Zhu,Xuebin Zhang,Dandan Yang,Xiaobin Tang
Two-dimensional CsPbX 3 perovskite nanosheets serve as unique platforms for polarized emission modulation. However, the integrated control mechanism of bandgap engineering and polarized optical properties remains largely unexplored. In this study, we demonstrated a halogen gradient strategy using iodine-doped CsPbBr 3-x I x nanosheets with polymer encapsulation, enabling simultaneous band structure modification and optical anisotropy regulation. The iodine gradient enabled continuous tuning of the degree of polarization (up to 0.39) across a broad-spectrum range of 520–677 nm. Notably, radiation-induced polarized emission was observed in perovskite nanostructures under X-ray excitation, revealing directional transport behavior under high-energy stimulation. This work presents a detailed systematic investigation into X-ray-induced linearly polarized luminescence from perovskite nanosheets. The polarization-sensitive response detector exhibited enhanced current ratios, which can be attributed to iodine-induced defect suppression. This work not only advances the field of polarized optoelectronics but also establishes new opportunities for the detection of X-ray polarization response.
研究领域:
纳米材料
·
光电子学
·
钙钛矿光子学
·
X射线探测
·
偏振光发射
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产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 28
·2101403
·
IF 13.281
Qiqian He,Gaoyu Chen,Yongkai Wang,Xiaoyu Liu,Danting Xu,Xiangxing Xu,Ying Liu,Jianchun Bao,Xun Wang
All-Inorganic perovskite CsPbX 3 (X = Cl, Br, I) quantum dots (QDs) have attracted tremendous attention in the past few years for their appealing performance in optoelectronic applications. Major properties of CsPbX 3 QDs include the positive photoconductivity (PPC) and the defect tolerance of the in-band trap states. Here it is reported that when hybridizing CsPbX 3 QDs with indium tin oxide (ITO) nanocrystals to form CsPbX 3 -ITO nano-heterojunctions (NHJs), a voltage tuned photoresponse—from PPC to negative photoconductivity (NPC) transform—is achieved in lateral drain-source structured ITO/CsPbX 3 -ITO-NHJs/ITO devices. A model combining exciton, charge separation, transport, and most critical the voltage driven electron filling of the in-band trap states with drain–source voltage ( V DS ) above a threshold, is proposed to understand this unusual PPC-NPC transform mechanism, which is different from that of any known nanomaterial system. This finding exhibits potentials for developing devices such as photodetectors, optoelectronic switches, and memories.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Ying Zhang,Haiou Zhu,Jilin Zheng,Guangyue Chai,Zongpeng Song,Yanping Chen,Yuanhai Liu,Siyu He,Yongqiang Shi,Yumin Tang,Meng Wang,Wenwen Liu,Lingfeng Jiang,Shuangchen Ruan
Perovskite quantum dots (QDs) have gained significant attention for both fundamental research and commercial applications because of their outstanding optoelectronic properties and tremendous application potentials. Reducing defect density in all-inorganic perovskite QDs is of great importance for performance enhancement. In this work, it is found that the UV-NIR femtosecond laser pulse treatments could increase the photoluminescence quantum yield (PLQY) of the CsPbBr3 perovskite QDs from 71 to 95%. Such an enhancement could be attributed to decrease of the defects after laser exposure, which is consistent with its red-shifted PL and other characterization results. Furthermore, the dynamics of energy transfer from exciton to trapping in irradiated CsPbX3 QDs are studied to gain an insight into the relative strength of exciton-trapping exchange coupling. The results confirm that the trapping defects are decreased by laser irradiation, and the mechanism leading to the enhancement of PLQY is revealed. In addition, the enhanced stability of laser-irradiated CsPbX3 QDs is also testified. Finally, the application of laser-treated perovskite QDs in the liquid crystal display (LCD) backlight film is successfully demonstrated. It is further anticipated that this mechanism is helpful for the design of perovskite-based optoelectronic applications such as LCD technology and light-emitting devices.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
高影响因子
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