OPTICAL MATERIALS
·
2023
·
IF 3.9
Kaimin Cui,Yuqing Wen,Xiaoyu Han,Zhenbang Hao,Jihong Zhang,Jun Xie
Suitable ions incorporation into CsPbX 3 perovskite nanocrystals can improve the luminescence efficiency, chemical stability, and more importantly modify the emission bands from semiconductor band gap change, for various applications. In this research, high content Zn 2+ was introduced into CsPbBr 3 quantum dots through a simple one-pot synthesis method. A new intense blue emission centered at 440 nm was observed from heavy Zn alloyed nanocrystals , for increased semiconductor band gap, along with green emission at 510 nm from CsPbBr 3 quantum dots , when the ratio of ZnBr 2 /PbBr 2 precursor was larger than unity. The appearance of Zn 3d peaks and the decreasing of bonding energy of Pb 4f peaks from X-ray photoelectron spectroscopy spectra indicated that Zn 2+ ions were incorporated into CsPbBr 3 quantum dots to form CsZn x Pb 1-x Br 3 alloyed quantum dots. The elements quantitative analysis showed that partial Zn 2+ ions in precursors were involved in the synthesis of the quantum dots, and the Zn alloyed perovskite nanocrystals could be described as CsPbBr 3 , CsZn 0.43 Pb 0.57 Br 3 , CsZn 0.54 Pb 0.46 Br 3 , CsZn 0.68 Pb 0.32 Br 3 respectively when the ZnBr 2 /PbBr 2 precursor ratios were 0:1, 1:1, 3:1 and 5:1. The X-ray diffraction patterns confirmed that the incorporation of small radius Zn 2+ ions into crystals led to crystal shrinkage, instead of crystal phase change. The transmission electron microscope images of the nanocrystals showed cubic geometries and reduced average sizes from 23.3 nm to 17.6 nm with Zn 2+ content increase, resulting in the blue shift of emission bands. The energy dispersive spectroscopy elemental mapping of nanocrystals also confirmed the incorporation of Zn 2+ ions into the nanocrystals.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 4
·1338-1347
·
IF 7
Xiuqiang Duan,Kun Nie,Xuyi Wang,Chi-An Cheng,Ranran Zhou,Ziyao Hu,Junbao Yan,Lefu Mei,Xiaoxue Ma,Songjun Yao,Luoxin Wang,Hua Wang
In recent years, all-inorganic perovskite materials have been considered and applied in various fields. In this work, we used an improved method to synthesize novel zero-dimensional (0D) lead-free Cs2Mn(Cl/Br)4·2H2O perovskite-analogue nanocrystals (PA NCs) under aerobic conditions. At the same time, lead (Pb) was introduced into manganese (Mn) halide perovskite-analogue nanocrystals of Cs2Mn(Cl/Br)4·2H2O via a hot-injection method. The PA NCs shows an intense orange light under a UV lamp. The fluorescence spectrum peak center of the PA NCs is located at around 598 nm, and the photoluminescence quantum yield (PLQY) is 41.12%. The PLQY of the original PA NCs was almost nonexistent at around 598 nm. The increase in PLQY was due to the replacement of Mn2+ with Pb2+, which effectively promotes the transfer of excitation energy to Mn2+. The Pb2+-doped Cs2Mn(Cl/Br)4·2H2O PA NCs also exhibit excellent stability and strong PL. We also applied the PA NCs to composite paper. The properties described in this study provide new design ideas and directions for potential optronic devices.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yaling Lin,Jie Hu,Yongwei Guo,Qilin Zou,Dejian Chen,Kunyuan Xu,Sisi Liang,Xiaodong Yi,Hongyu Lu,Shi-Bin Wang,Haomiao Zhu
The emission of persistent luminescence nanoparticles (PLNPs) is in the second near infrared region (NIR-II, 1000–1700 nm), considered as ideal fluorescence imaging materials because of their special characteristic consist of no autofluorescence, weak scattering and deep tissue penetration depth in biological tissues. However, it is still a great challenge to enhance their persistent luminescence intensity. Herein, we reported a new MgGe 0.8 Ga 0.2 O 3 : Yb 3+ (MGGO: Yb 3+ ) PLNPs, which were synthesized through solvothermal liquid-solid-solution and salt microemulsion method. We found that partially replacing Ge 4+ with Ga 3+ ions in MgGeO 3 host can increase the density of traps, thus significantly improving the NIR-II persistent luminescence intensity of Yb 3+ ions (the decay time is more than 33 min). Moreover, X-ray could be used to repeatedly stimulate the NIR-II persistent emission of MGGO: Yb 3+ , which is pivotal for deep tissues long term imaging. The optical penetration length of Yb 3+ ions persistent luminescence was assessed to be 3.9 mm via capping tissue. The above results reveal that MGGO: Yb 3+ PLNPs are promising material to be applied to deep-tissue imaging field.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhuoqi Wen,Zhongjie Cui,Dan Yang,Haiyang He,Shuaitao Qin,Sinong Wang,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Two-dimensional (2D) lead halide perovskite with attractive properties is considered one of the most promising candidates for preparing blue-emitting materials and corresponding optoelectronic devices. For the formamidinium-based (FA) nanoplatelets (NPLs), despite exhibiting better optical performance compared to their counterparts, it is still challenging to precisely control their emission in the blue region during synthesis and the influence of chloroform on the components of FAPbBr 3 have not been investigated thoroughly. Herein, it is revealed that the decomposition of chloroform during the synthesis will introduce Cl into the crystal with the assistance of surface ligands, leading to the mixed-halide perovskite. Further, an A-site cation strategy was introduced for tuning the spectra of FAPbBr 3 NPLs. The addition of Cs with a small ionic radius can shrink the arrangement of octahedrons and enhance their interactions, which will promote the seeding growth of perovskite and form uniform crystals. With help of surface ligands, these uniform crystals will further grow to form homogeneous perovskite NPLs. The obtained NPLs show the pure emission from sky-blue to deep-blue. To the best of our knowledge, it is the first report about finely tuning the emission of FAPbBr 3 in the blue region. This crystallization control strategy by introducing Cs is beneficial for their further applications in the field of photoelectric devices.
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Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 1
·241-250
·
IF 14.511
Fanqi Luo,Mingyang Liu,Mang Zheng,Qi Li,Hong Wang,Jing Zhou,Yong Jiang,Yaoguang Yu,Baojiang Jiang
Realizing CO2 reduction with H2O oxidation on g-C3N4-based photocatalysts is quite promising yet challenging. Herein, an efficient direct Z-scheme heterostructure of ultrathin CsPbBr3/g-C3N4 nanosheets is fabricated via a simple electrostatic self-assembly process, resulting in an effective photocatalytic reduction of CO2 to CH4 (184.0 μmol g−1) and CO (105.2 μmol g−1) with oxidation of H2O under AM 1.5G irradiation. Notably, in situ X-ray photoelectron spectroscopy (XPS) analysis demonstrated that a direct Z-scheme charge transfer mechanism at the CsPbBr3 and g-C3N4 interface is enabled, thereby achieving efficient charge separation and high redox potentials to drive photocatalytic CO2 reduction and H2O oxidation synchronously. Isotopic labelling experiments revealed that the adsorbed water is activated to release H atoms and eventually assists the CO2 reduction. Theoretical calculations further revealed that the p orbitals of Pb atoms hybridize with the 2π* orbitals of CO2 molecules, strengthening the affinity of CO2 and weakening the binding strength. Moreover, overlapping between Pb p orbitals and 5σ orbitals of CO molecules promote the protonation of CO* intermediates. This work provides an in-depth understanding and guidance for constructing high-efficiency catalysts for CO2 reduction with H2O oxidation.
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InfoMat
·
2023
·
IF 22.7
Peilin Liu,Shuaicheng Lu,Jing Liu,Bing Xia,Gaoyuan Yang,Mo Ke,Xuezhi Zhao,Junrui Yang,Yuxuan Liu,Ciyu Ge,Guijie Liang,Wei Chen,Xinzheng Lan,Jianbing Zhang,Liang Gao,Jiang Tang
Lead sulfide (PbS) colloidal quantum dot (CQD) photodiodes integrated with silicon-based readout integrated circuits (ROICs) offer a promising solution for the next-generation short-wave infrared (SWIR) imaging technology. Despite their potential, large-size CQD photodiodes pose a challenge due to high dark currents resulting from surface states on non-passivated (100) facets and trap states generated by CQD fusion. In this work, we present a novel approach to address this issue by introducing double-ended ligands that supplementally passivate (100) facets of halide-capped large-size CQDs, leading to suppressed bandtail states and reduced defect concentration. Our results demonstrate that the dark current density is highly suppressed by about an order of magnitude to 9.6 nA cm −2 at −10 mV, which is among the lowest reported for PbS CQD photodiodes. Furthermore, the performance of the photodiodes is exemplary, yielding an external quantum efficiency of 50.8% (which corresponds to a responsivity of 0.532 A W −1 ) and a specific detectivity of 2.5 × 10 12 Jones at 1300 nm. By integrating CQD photodiodes with CMOS ROICs, the CQD imager provides high-resolution (640 × 512) SWIR imaging for infrared penetration and material discrimination.
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Materials
·
2023
·Vol. 16
·期 24
·7585
·
IF 3.4
Xianghua Wang,Lin Zhou,Xudong Zhao,Wenlong Ma,Xinjun Wang
In this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr3and Cs3NdCl6QDs via hot injection methods and mixed in various ratios at room temperature for color blending. Nd-doped CsPb(Cl/Br)3QDs showed a blueshift in emission, and the photoluminescence quantum yields (PLQY, ΦPL) were lower in the 460–470 nm range due to surface halogen and Cs vacancies. To address this, we introduced a silane molecule, APTMS, via a ligand exchange process, effectively repairing these vacancies and enhancing Nd doping into the lattice. This modification promotes the PLQY to 94% at 466 nm. Furthermore, combining these QDs with [1]Benzothieno[3,2-b][1]benzothiophene (BTBT), a conjugated small-molecule semiconductor, in a composite film reduced PLQY loss caused by FRET in solid-state QD films. This approach achieved a wide color gamut of 124% National Television System Committee (NTSC), using a UV LED backlight and RGB perovskite QDs in a BTBT-based organic matrix as the color conversion layer. Significantly, the photostability of this composite was enhanced when used as a color conversion layer (CCL) under blue-LED excitation.Keywords:exciton;quantum dots;exciton binding energy;zeta potential;Förster resonance energy transfer;nanostrain;color conversion layer
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高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Hu Shen,Song Zhang,Mengqi Jin,Rong Liu,Dong Yang,Xin Zhou,Shengmin Wang,Zhitao Shen,Ying Liu,Fumin Li,Huilin Li,Ruirui Cao,Chong Chen
Cadmium selenide (CdSe) quantum dots (QDs) as functional interface layer have been used to improve the performances of perovskite solar cells (PSCs). However, the optimization of PSCs by CdSe QDs has some challenges of inferior performances for charge transportation, and interface defects, which are not conducive to the development of power conversion efficiency (PCE). Here, sodium thiosulfate capped CdSe QDs (S 2 O 3 2- -CdSe QDs) are prepared as interface modifiers to improve the performances of PSCs. The S 2 O 3 2- -CdSe QDs can effectively passivate defects and reduce interfacial nonradiative recombination, Moreover, the S 2 O 3 2- -CdSe QDs regulate the energy level of perovskite film. In addition, the S 2 O 3 2- -CdSe QDs form an interface layer to increase moisture resistance and improve the stability of PSCs. As a result, the devices with S 2 O 3 2- -CdSe QDs show an improved power conversion efficiency (PCE) of 22.57 %. Meanwhile, the stabilities of the unencapsulated device with S 2 O 3 2- -CdSe QDs under 25 °C with a humidity of 30 %–40 %, and 85 °C in N 2 heat both perform better than the control devices.
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Nanomaterials
·
2023
·Vol. 13
·期 24
·3102
·
IF 5.3
Qun Zhang,Yuefeng Gao,Lihong Cheng,You Li,Sai Xu,Baojiu Chen
Novel and high-security anti-counterfeiting technology has always been the focus of attention and research. This work proposes a nanocomposite combination of upconversion nanoparticles (UCNPs) and perovskite quantum dots (PeQDs) to achieve color-adjustable dual-mode luminescence anti-counterfeiting. Firstly, a series of NaGdF4: Yb/Tm UCNPs with different sizes were synthesized, and their thermal-enhanced upconversion luminescence performances were investigated. The upconversion luminescence (UCL) intensity of the samples increases with rising temperature, and the UCL thermal enhancement factor rises as the particle size decreases. This intriguing thermal enhancement phenomenon can be attributed to the mitigation of surface luminescence quenching. Furthermore, CsPbBr3PeQDs were well adhered to the surfaces and surroundings of the UCNPs. Leveraging energy transfer and the contrasting temperature responses of UCNPs and PeQDs, this nanocomposite was utilized as a dual-mode thermochromic anti-counterfeiting system. As the temperature increases, the color of the composite changes from green to pink under 980 nm excitation, while it displays green to non-luminescence under 365 nm excitation. This new anti-counterfeiting material, with its high security and convenience, has great potential in anti-counterfeiting applications.Keywords:anti-counterfeiting;upconversion nanoparticles;perovskite quantum dots;thermal enhancement luminescence
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Materials
·
2023
·Vol. 16
·期 17
·6010
·
IF 3.4
Longfei Yuan,Taixin Zhou,Fengmin Jin,Guohong Liang,Yuxiang Liao,Aijuan Zhao,Wenbo Yan
Transmission electron microscopy (TEM) is an excellent characterization method to analyze the size, morphology, crystalline state, and microstructure of perovskite quantum dots (PeQDs). Nevertheless, the electron beam of TEM as an illumination source provides high energy, which causes morphological variation (fusion and melting) and recession of the crystalline structure in low radiolysis tolerance specimens. Hence, a novel and facile strategy is proposed: electron beam peel [PbBr6]4−octahedron defects from the surface of QDs to optimize the crystal structure. TEM and high-angle annular dark-field scanning TEM (HAADF) tests indicate that the [PbBr6]4−octahedron would be peeled from the surface of QDs when QDs samples were irradiated under high-power irradiation, and then a clear image would be obtained. To avoid interference from a protective film of “carbon deposits” on the surface of the sample when using high resolution TEM, amorphous carbon film (15–20 nm) was deposited on the surface of QDs film and then characterized by TEM and HAADF. The detection consequences showed that the defection of PbBr2on the surface of QDs will gradually disappear with the extension of radiation time, which further verifies the conjecture.Keywords:transmission electron microscopy;perovskite quantum dots;[PbBr6]4−octahedron;defect
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Nanoscale
·
2023
·Vol. 15
·期 38
·15635-15642
·
IF 6.7
Mingzhu Hu,Yumeng Wang,Shengpeng Hu,Zongpeng Wang,Bi Du,Yanjun Peng,Jiawei Yang,Yunjie Shi,Dongdong Chen,Xi Chen,Ziwen Zhuang,Zhixun Wang,Xi Chen,Jiecheng Yang,Yongshuai Ge,Eyu Wang,Quan Wen,Shuang Xiao,Ming Ma,Weimin Li,Jie Zhang,De Ning,Lei Wei,Chunlei Yang,Ming Chen
Scintillators with high spatial resolution at a low radiation dose rate are desirable for X-ray medical imaging. A low radiation dose rate can be achieved using a sufficiently thick scintillator layer to absorb the incident X-ray energy completely, however, often at the expense of low spatial resolution due to the issue of optical crosstalk of scintillation light. Therefore, to achieve high sensitivity combined with high-resolution imaging, a thick scintillator with perfect light guiding properties is in high demand. Herein, a new strategy is developed to address this issue by embedding liquid scintillators into lead-containing fiber-optical plates (FOPs, n = 1.5) via the siphon effect. The liquid scintillator is composed of perovskite quantum dots (QDs)/2,5-diphenyloxazole (PPO) and the non-polar high-refractive index (n = 1.66) solvent α-bremnaphthalene. Benefiting from the pixelated and thickness-adjustable scintillators, the proposed CsPbBr3 QDs/PPO liquid scintillator-based X-ray detector achieves a detection limit of 79.1 μGy s−1 and a spatial resolution of 4.6 lp mm−1. In addition, it displays excellent tolerance against radiation (>34 h) and shows outstanding stability under ambient conditions (>160 h). This strategy could also be applied to other liquid scintillators (such as CsPbCl3 QDs and Mn:CsPbCl3 QDs). The combination of high sensitivity, high spatial resolution and stability, easy fabrication and maintenance, and a reusable substrate matrix makes these liquid scintillators a promising candidate for practical X-ray medical imaging applications.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Xue Yanrong,Zhao Jiwu,Huang Liang,Lu Ying-Rui,Malek Abdul,Gao Ge,Zhuang Zhongbin,Wang Dingsheng,Yavuz Cafer T.,Lu Xu
Ruthenium dioxide is the most promising alternative to the prevailing but expensive iridium-based catalysts for the oxygen evolution reaction in proton-exchange membrane water electrolyzers. However, the under-coordinated lattice oxygen of ruthenium dioxide is prone to over-oxidation, and oxygen vacancies are formed at high oxidation potentials under acidic corrosive conditions. Consequently, ruthenium atoms adjacent to oxygen vacancies are oxidized into soluble high-valence derivatives, causing the collapse of the ruthenium dioxide crystal structure and leading to its poor stability. Here, we report an oxyanion protection strategy to prevent the formation of oxygen vacancies on the ruthenium dioxide surface by forming coordination-saturated lattice oxygen. Combining density functional theory calculations, electrochemical measurements, and a suite of operando spectroscopies, we showcase that barium-anchored sulfate can greatly impede ruthenium loss and extend the lifetime of ruthenium-based catalysts during acidic oxygen evolution, while maintaining the activity. This work paves a new way for designing stable and active anode catalysts toward acidic water splitting.
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