Advanced Optical Materials
·
2022
·Vol. 10
·期 12
·2200087
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IF 10.05
Wenhao Bai,Tongtong Xuan,Haiyan Zhao,Shuchen Shi,Xiaoyu Zhang,Tianliang Zhou,Le Wang,Rong-Jun Xie
Group III–V semiconductor-based microscale light-emitting diode (micro-LED) displays are recognized as one of the most promising display technologies with superhigh brightness and resolution, strong contrast, and superlarge color gamut but currently suffer from low efficiency, low production yield, and high cost. Here, it is proposed to realize cost-effective and full-color micro-LED displays by using microscale perovskite quantum dot LEDs (micro-PeLEDs) as emitters. Bright and uniform red-, green-, and blue-emitting (RGB) micro-PeLED arrays with each pixel size as small as 45 µm are fabricated by in situ inkjet printing a perovskite quantum dot (PeQD) emissive layer in the structure of indium tin oxide/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/poly(9-vinylcarbazole) (PVK)/sodium dodecyl sulfate (SDS)/PeQD/1,3,5-tris(1-phenyl-1 H -benzimidazol-2-yl)benzene (TPBi)/LiF/Al. These RGB micro-PeLED arrays display an external quantum efficiency of 0.832%, 0.419%, and 0.052% for red, green, and blue colors, a resolution of 210 PPI, and a wide color gamut (135% of the National Television Standards Committee standard). The authors further demonstrate flexible and full-color active-matrix micro-PeLED displays, which have potential applications in future ultrahigh-definition displays, light communication, and artificial intelligence.
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Nano Energy
·
2022
·
IF 19.069
Fei Gao,Xiaonan Zhu,Qiushi Feng,Weiheng Zhong,Weizhen Liu,Haiyang Xu,Yichun Liu
Lead-free metal halide perovskites are promising materials for future optoelectronic application , which have recently attracted great attention for their environmental-friendliness and excellent light emission properties. However, the development of deep-blue emission lead-free halide perovskite nanocrystal is still far behind in performance in comparison with its red/green counterparts. Herein, the lead-free Cs 3 Cu 2 I 5 nanocrystals are prepared via a modified hot-injection strategy. By adding InI 3 as precursor, the synthesized Cs 3 Cu 2 I 5 single-phase nanocrystals show a bright deep-blue emission peaked at ~440 nm, with a record high photoluminescence quantum yield (PL QY) up to 96.6% at an optimized InI 3 content of 0.15 mmol. The InI 3 additive contributes to the high PL QY through both iodide vacancy reparation of I - ions and size-controlled growth of In 3+ ions. First principle calculations reveal that the broadband blue emission originates from self-trapped excitons in Cs 3 Cu 2 I 5 , which are formed due to the excited-state lattice expansion and Cu-I bond lengthening of [Cu 2 I 5 ] 3- cluster under light excitation . The good stabilities of these Cs 3 Cu 2 I 5 nanocrystals against heat, water, UV irradiation and environmental storage are also investigated experimentally and theoretically in detail. For application demonstration, light-emitting devices are manufactured by using these Cs 3 Cu 2 I 5 nanocrystals powder as phosphor, which exhibit good working stability with a half-lifetime over 300 h. Besides, the Cs 3 Cu 2 I 5 nanocrystals solution is also utilized as fluorescent ink, and the printed patterns can maintain anti-counterfeiting features even after treatment by heating and long-term environmental storage, indicating the robustness of these Cs 3 Cu 2 I 5 nanocrystals for potential anti-counterfeiting application.
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CATALYSIS TODAY
·
2022
·
IF 6.562
Gongguo Zhang,Yingying Wang,Yanyun Ma,Yiqun Zheng,Haifeng Zhang,Mingyu Tang,Yunqian Dai
We report the fabrication of PdSm bimetallic nanocrystals with controlled shapes and explore their applications as the electrocatalysts for electroxidation of ethanol (EOR) in alkaline medium. The success of current synthesis relies on the co-reduction of Pd(acac) 2 and Sm(acac) 3 in the presence of N-oleyl-1,3-propanediamine (OPDA) and Mo(CO) 6 at an elevated temperature. For the first time, ultrathin nanostructures composed of Pd-rare earth metal bimetals could be prepared in high purity, in the form of ultrathin porous nanosheets and concave tetrahedra, together with the size/edge length limited to sub-3 nm size range. When serving as electrocatalysts for EOR, the carbon-supported PdSm nanocrystals exhibited in seven-fold increase in mass activity as compared to that of Pt/C, as well as improved reaction kinetics and long-term durability. DFT calculations verify that the PdSm NCs/C catalyst modulate the reaction pathway of ethanol oxidation with lower energy barriers as compared with Pd catalyst, accounting for the improved catalytic performance. The present study provides a feasible strategy to create rare earth metal-doped bimetallic nanocrystals with controlled morphology for rational design over fuel cell catalysts and could be extended to other noble metals or alloys.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 22
·2112129
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IF 19.924
Xi Chen,Zhiguo Sun,Bo Cai,Xiaoming Li,Shihua Zhang,Di Fu,Yousheng Zou,Zhiyong Fan,Haibo Zeng
Solution-processed lead halide perovskites (LHPs) hold great promise for low-cost high-performance solar cells and light-emitting devices, but they also suffer from a serious operating instability problem due to the ionic migration and lattice decomposition driven by strong electric fields. Here, considerably suppressed ionic migration and enhanced lattice stability in LHPs with partial substitution of Pb with 3d transition metal (TM: Mn and Ni) are reported. It is experimentally shown that the energy barrier for ionic migration in CsPbBr 3 can be increased fourfold by Mn and Ni substitution, even with a small doping level ( < 4%). However, post-TM Zn and non-TM Bi incorporations are less efficient in suppressing ionic migration. The theoretical results reveal that Ni and Mn ions with partially filled 3d orbitals can passivate the active lone-pair electron of surrounding Pb-Br octahedrons via a coordination effect and reduce the Pb 6s-Br 4p antibonding states, resulting in long-range lattice stabilization and suppressed ionic migration. The Ni incorporation strategy in mixed-halogen CsPbBr 1.5 I 1.5 is further demonstrated, for which the field-driven halogen segregation is significantly mitigated and the associated emission color variation is reduced sixfold. This study paves the way for improving the operating stability in LHP-based optoelectronic and electronic devices.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 10
·7349-7356
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IF 2.779
Zhou Xin,Tong Xuan,Li Xiaolong,Min Yonggang,Qian Yannan
To balance the carrier injection, adjusting the thickness of PEDOT:PSS through a simple water diluting was a feasible strategy to improve the efficiency of CsPbBrI 2 perovskite quantum dots light-emitting diode (PeLED). CsPbBrI 2 perovskite quantum dots (PeQDs) with a uniform and monodisperse cubic phase exhibited a red light at 649 nm and with CIE of (0.697, 0.302). Based on PEDOT:PSS film with the thickness of 40 nm, a CsPbBrI 2 PeLED displayed 4.3-fold external quantum efficiency improvement up to 3.44%, and 22.3-fold enhancement in luminance, which was attributed to an effective hole transport and an increased electrical conductivity.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5374-5383
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IF 4.682
Qin Wenjing,Zheng Kai,Liu Hengchao,Chu Jingting
The CsPbBr 3 /Cs 4 PbBr 6 perovskite composite material has received wide attention due to its good stability and photoelectric properties, and it is promising to appear in various photoelectric applications. However, there are still some challenges in how to control the synthesis of this material and obtain the balance between high fluorescence efficiency and well stability. In this study, we proposed a rapid anti-solvent vapor-assisted method to prepare CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) with hexagonal tower structure. It is found that oleic acid and oleamine can effectively control the morphology, grain size and optical properties of the material. This unique hexagonal tower structure CsPbBr 3 /Cs 4 PbBr 6 MCs has excellent optical properties, showing strong green emission at 514 nm and PLQY of 78.4 ± 4.3%, with a narrow full width at half maximum value of 20 nm. In addition, environmental stability experiments have shown that after 6 months of storage under 50% relative humidity, the PL strength loss is lower than 20%. Graphical Abstract
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Ru-Kun Ding,Xiao-Song Zhang,Lan Li,Jian-Ping Xu,Li-Na Kong,Xiao-Kai Gong,Hao Yin,Zhao-Wei Zhang,Qian Li,Long Liu
Lead halide perovskites have received extensive attention due to their excellent photoelectric and photonic properties. However, low stability is an obstacle to material production and optoelectronic applications. In this research study, CsPbBr3/Cs2SiF6:Mn4+ rivet nanostructured perovskites coated with ZnS and self-passivation layers have been synthesized. The rivet nanostructured perovskites are applied in tunable white light-emitting diode (WLED) devices and tunable flexible white electroluminescent (EL) devices. The red and green dual-wavelength tunable luminescence in the rivet nanostructured perovskites has been obtained via Cs ion sharing. Upon the addition of ZnS and a self-passivation aluminum layer coating on the surface of the rivet perovskites, the photoluminescence (PL) intensity and the stability increased by 588.7 and 323.6%, respectively. In addition, a series of spectrally tunable WLED devices with an InGaN blue LED chip and flexible white EL devices is fabricated using the CsPbBr3/Cs2SiF6:Mn4+/2ZnS/Al rivet nanostructured perovskites. The tunable WLED devices can produce standard white light and cold and warm white light. The tunable EL devices produce luminescence even at 60° bending. By studying the temperature-dependent PL spectra of CsPbBr3/Cs2SiF6:Mn4+/nZnS/Al rivet nanostructured perovskites, the energy transfer mechanism at cryogenic and room temperatures is analyzed. At the same time, the protection principle of the self-passivation coating on the CsPbBr3/Cs2SiF6:Mn4+ rivet nanostructured perovskites is discussed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qi Si Chen,Peng Lei Cui,Jun Yang,Dong Chen,Hui Liu,Huiyan Feng,Panagiotis Tsiakaras,Pei Kang Shen
Electrochemical carbon dioxide reduction reaction (CO 2 RR) is regarded as an effective strategy to store abundant renewable energy and build a carbon neutral society. Gold (Au) and silver (Ag)-based catalysts for the effective electrochemical transformation of CO 2 to CO emerge as promising candidates. Heterogeneous nanocomposites composed of noble metals and semiconductors exhibit great potential for electrocatalytic CO 2 reduction through the electronic coupling effect at coherent interfaces. Herein, we successfully synthesize heterogeneous Ag 2 S-Au composite nanoparticles (NPs) as effective catalysts for CO production through CO 2 RR. At −0.8 V vs RHE, the heterogeneous Ag 2 S-Au nanocatalysts display a considerable CO Faradaic efficiency of 94.5%, and an appreciable CO partial current density of 9.17 mA cm −2 . Moreover, they exhibit good stability for 30 h without obvious decrease. On the basis of density functional theory (DFT) calculations, it can be made clear that the heterogeneous Ag 2 S-Au interface is energetically more beneficial to the generation of COOH* intermediate for CO 2 RR. This study provides a new application for noble metal–semiconductor nanocomposites.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Kaijia Zhang,Jian Dong,Jun Lu,Lan Li,Huan Liang,Jing Jin,Peng Wang,Xiaolian Sun,Qing Jiang
Bone fracture is a huge medical and sociological problem. Among various therapeutic drugs, icaritin (ICA), as a novel natural osteoinductive agent, has attracted considerable attention due to its remarkable osteogenic effect, but it still has some drawbacks such as poor bone targeting and a rapid plasma clearance rate. Recently, iron oxide nanoparticles (IONPs) show increasingly potential as drug delivery vehicles to overcome these limitations. In this study, porous hollow iron oxide nanoparticles (PHNPs) were synthesized via thermal decomposition and controllable oxidation methods and ICA was incorporated during the hydrophilic phase transfer process. The preosteoblastic MC3T3-E1 cell line was used to evaluate their osteogenic effect, and the results demonstrated that ICA-incorporated PHNPs displayed superior biocompatibility and pronounced alkaline phosphatase activity and expression of osteogenic-related genes and proteins in a synergistic manner. Mechanistic investigations demonstrated that the MEK/ERK/p90RSK signaling pathway might provide a potential explanation for ICA-incorporated PHNP-mediated osteogenic differentiation. Furthermore, hyaluronic acid–cholesterol (HA–CHOL) was used to establish nanoclusters (ICA-PHNP-NCs) for in vivo bone regeneration assessment using a murine femur fracture as a model. The results showed that ICA-PHNP-NCs efficiently accumulated at the fracture site in the presence of a static magnetic field and accelerated fracture repair rapidly and effectively. For the first time, the dual application of osteogenic agents transport and ICA delivery using the ICA-PHNP-NC formulation was achieved against bone fracture, providing a new treatment strategy for diseases related to fractures.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Dengfeng Luo,Sirui Yang,Wei Zhang,Qing Zhang,Limei Cha,Li Dang,Ming-De Li
Doping metal ions into lead halide perovskite nanocrystals is one of the most efficient strategies to control their photoelectric properties. Here, we develop a simple and low-cost route to synthesize the high-quality alkaline-earth metal ion (AE2+)-doped CsPbBr3 nanocrystals at room temperature. The almost 100% promoted photoluminescence quantum yield behavior of AE2+-doped CsPbBr3 nanocrystals is demonstrated by an ultrafast dynamics study and theoretical calculations on the dopant defect formation energies and electronic properties. The AE2+ dopants can promote the radiation recombination of carriers by essentially reducing the carriers trapped into intraband and interband defect states and promote the intraband coupling. Furthermore, Br– and Pb2+ vacancies can be eliminated to enhance the short-range order of the CsPbBr3 lattice and enrich the conduction band edge states, leading to the photoluminescence enhancement of CsPbBr3 nanocrystals. Our studies provide new insights into the mechanism of AE2+-doped effects and present guiding strategies for improving the optical performance of doped perovskite nanocrystals.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 20
·9658-9665
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IF 3.925
Bo Song,Mengyan Li,Junyu Ren,Qi Liu,Xinyi Wen,Wenzhu Zhang,Jingli Yuan
The combination of complementary optical imaging and magnetic resonance imaging (MRI) techniques evolved to provide an even more powerful tool to simultaneously obtain both molecular information and anatomical information as well as to dramatically improve the accuracy of detection. Herein, we report a new tumor-targetable bimodal time-gated luminescence (TGL)–MRI nanoprobe for tracing cancer cells in vitro and in vivo. The nanoprobe was constructed by coating superparamagnetic Fe3O4 nanoparticles with functional silica shells that encapsulated luminescent Eu3+ complexes and were decorated with tumor-targeting molecules, folic acid (FA), on the surface. The fabricated nanoprobe possesses strong long-lived luminescence and excellent magnetic properties, as well as outstanding stability, biocompatibility and dispersibility in water. Furthermore, the nanoprobe can specifically bind to FA receptor-overexpressed cancer cells, allowing it to be accumulated in these cells. These features enable the nanoprobe to be successfully used for TGL imaging of cultured cancer cells and bimodal TGL–MR imaging of tumors in tumor-bearing mice with high sensitivity and accuracy. The research outcomes will contribute to the development of a new bimodal optical/MR imaging nanoprobe for the tracing and precise detection of cancerous cells.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhipeng Zhang,Bingzhe Wang,Hai-Bing Zhao,Jin-Feng Liao,Zi-Chun Zhou,Tanghao Liu,Bingchen He,Qi Wei,Shi Chen,Hong-Yan Chen,Dai-Bin Kuang,Ying Li,Guichuan Xing
Lead-free double perovskites with superior stability have been considered as promising non-toxic substitutes to their lead-contained counterparts in photocatalysis . However, the severe charge recombination greatly restricts their potential as high-performance photocatalysts. Herein, for the first time, we present a self-assembled heterostructure of lead-free double perovskite Cs 2 AgBiBr 6 nanocrystals (NCs) on the surface of MXene nanosheets via mutual electrostatic attraction. The presence of MXene nanosheets effectively promotes the formation of free charge carriers in Cs 2 AgBiBr 6 NCs via reducing the exciton binding energy. Additionally, the ultrafast photogenerated electron transfer from Cs 2 AgBiBr 6 to MXene with a timescale of 1.1 ps largely prolongs the charge carrier lifetime by two times. As a result of the efficient charge separation and electron extraction, the Cs 2 AgBiBr 6 /MXene heterostructures achieve a high photoelectron consumption yield of 50.6 µmol g −1 h −1 for photocatalytic CO 2 reduction, which surpasses most previously reported lead-free perovskite-based catalysts.
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