JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Xiaoyu Wang,Qibin Shen,Yansong Chen,Nasir Ali,Ziyang Ren,Gang Bi,Huizhen Wu
Halide lead perovskites are considered as one of the most promising optoelectronic materials in decades, but the toxicity and bio-accumulation of lead retard the commercialization. Therefore, seeking suitable lead-free perovskites and their variants are of vital importance. In this work, all-inorganic zinc halide perovskite variant Cs 2 ZnCl 4 crystals with Sb 3+ doping are synthesized via hydrothermal method . Transparent millimeter-sized crystals exhibit bright red photoluminescence (PL) under room temperature (RT) on account of self-trapped exciton (STE) emission of Sb 3+ , from 3 P 1 to 1 S 0 states. Temperature-dependent PL and time-resolved PL exhibit bimodality and intensity variations, revealing that Jahn-Teller effect of 3 P 1 state results two energy minima, and thermal activation may contribute to the spectrum change. Further, DFT calculations are carried out and the influences of Sb 3+ doping are revealed. A bandgap reduction is achieved via doping, and the band edges are localized at Sb 3+ . A combination of experimental and theoretical studies demonstrates well that the soft lattice structure and the 5s 2 lone pairs of Sb are vital for the STE emission.
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JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 155
·期 23
·
IF 3.488
Cao Jianfei,Yin Zuodong,Pang Qi,Lu Yuexi,Nong Xiuqing,Zhang Jin Zhong
In this work, we demonstrated an in situ approach for doping CsPbBr 3 nanocrystals (NCs) with In 3+ and Cl − with a ligand-assisted precipitation method at room temperature. The In 3+ and Cl − co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet–visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In 3+ -doping induced localized impurity states is revealed. Furthermore, the impact of In 3+ and Cl − doping on charge transfer (CT) from the NCs to molecular acceptors was investigated and the results indicate that the CT at the interface of NCs can be tuned and promoted by In 3+ and Cl − co-doping. This enhanced CT is attributed to the enlarged energy difference between relevant states of the molecular acceptor and the NCs by In 3+ and Cl − upon co-doping. This work provides insight into how to control interfacial CT in perovskite NCs, which is important for optoelectronic applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zihao Xu,Meng Rong,Shan Ni,Qiyu Meng,Liyan Chen,Huizhou Liu,Liangrong Yang
Hypercrosslinked polymers (HCPs) with synergistic effect of ether oxygen and phenolic hydroxyl groups was designed and fabricated for Cs + isolation in the salt lake system. The separation factors (S.F.)(Cs + /K + ) of the adsorbents were significantly increased through regulating the content of the ether oxygen group in the frameworks. The S.F. of PO-HCPs-6 was increased by nearly 5 times to an ultra-high value (S.F. = 57) compared with the Cs + adsorbents reported in the literature. Moreover, the mild and sufficient polymerization process endowed PO-HCPs-6 with an extremely fast kinetic adsorption rate. PO-HCPs-6 could quickly reach 90% of the equilibrium adsorption capacity in just 1 min . Finally, after 5 times adsorption–desorption experiments, the remarkable elution rate (>92%) and reusability adsorption capacity (>91%) of PO-HCPs-6 proved it has inspiring application potential for the Cs + isolation in the salt lake brine system.
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Laser & Photonics Reviews
·
2021
·Vol. 16
·期 2
·2100439
·
IF 13.138
Siping Liu,Bin Yang,Junsheng Chen,Daoyuan Zheng,Zhe Tang,Weiqiao Deng,Keli Han
Vacancy-ordered perovskite nanocrystals (NCs) have recently attracted much interest owing to their unique structure and optical properties; however, regulating self-trapped excitons (STEs) in vacancy-ordered perovskite NCs to exhibit tunable multicolor emission is still challenging because of the highly localized charge distribution and strong carrier-phonon coupling. Herein, the first colloidal synthesis of lead-free vacancy-ordered Cs 2 HfCl 6 perovskite NCs by a hot-injection method using hafnium acetylacetonate as metal precursors is reported. The passivation strategy of sub-bandgap trap states inside Cs 2 HfCl 6 NCs is proposed by doping Sb 3+ . X-ray photoelectron spectroscopy (XPS) measurements verify that the passivation of sub-bandgap trap states may be attributed to the enhanced chemical interaction between the Hf 4+ cations and Cl – anions. Simultaneously, the introduction of Sb 3+ ions yields a bright orange emission. Employing lanthanide acetylacetonate compounds, four lanthanide ions including Pr 3+ , Eu 3+ , Tb 3+ , and Ho 3+ are doped into the Cs 2 HfCl 6 NCs, which achieves tunable multicolor emissions (from blue to green to pink) through the energy transfer from STEs to lanthanide ions. This investigation not only develops a novel vacancy-ordered perovskite NCs, but also provides effective strategies for tuning the optical properties of lead-free vacancy-ordered perovskite NCs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Mengzhu Li,Ting Wang,Mengyun Zhao,Yifan Wang
Converting corn straw into high-value chemicals and H 2 energy is of great significance to the effective utilization of biomass resources . Based on the proton exchange membrane electrolysis technology, a circular electrolysis system for H 2 evolution and corn straw degradation was built using polyoxometalate (POM) catalysts as redox media and charge carriers. Under mild conditions (80 °C), the influence of factors such as reaction temperature, reaction time, catalyst concentration, and current density on the research system was explored. As a result, the efficient use of corn straw has been realized. The degradation rate of corn straw was as high as 63.48%, and the Faraday efficiency of H 2 production by electrolysis reaches 94.54%. The degradation products of corn straw were characterized and analyzed by SEM , FT-IR, XPS , GC-MS, and 2D HSQC NMR. This technique provides a potentially new pathway for H 2 production and corn straw processing.
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Surfaces and Interfaces
·
2021
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IF 4.837
Lu Huang,Can Liu,Cewei Ren,Ziqi Nie,Xinlin Xiong,Lichao Zeng,Wenqing Zhu,Weiguang Yang,Linjun Wang
ABSTRACT Controlling perovskite phase composition plays an important role in improving the quality of quasi-2D blue emissive perovskite thin films to realize spectrally stability of perovskite LED (PeLED). Herein, the high quality quasi-2D perovskite thin films were prepared by low pressure flashing induce crystallization (LPFC) method, which promoted surface coverage of perovskites to control the removal speed of solvent mixtures unanimously by adjusting the pressure of post-treatment from 1 KPa to 101 KPa. Compared to the common post-treatment method, perovskite thin films produced different quasi-2D phase under the pressure of 20 KPa by LPFC method and corresponding devices possessed high luminance with spectrally stability. Furthermore, the facile LPFC method promoted the volatile speed of high boiling point single solvent and accelerate the crystallization process to realize high quality of quasi-2D perovskite thin films prepared at room temperature.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17281-17289
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IF 4.39
Dayu Huang,Yue Liu,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The stability of perovskite quantum dots (PQDs) plays a vital role in practical devices. Besides silica coating, embedding PQDs in zeolites is another strategy to improve their stability significantly. Although the zeolite rigid framework has been reported to protect PQDs, there are few reports on the in situ synthesis of PQDs in zeolites. In this work, cubic phase CsPbX3 (X = Br, I) nanocrystals were successfully prepared by the ion exchange method combined with a non-polar organic trigger. Dropping a certain amount of ZnM2 (M = Br, I) solution into the intermediate product Cs4PbCl6 nanocrystals resulted in the formation of the final CsPbX3 nanocrystals. The ZnM2 solutions were prepared in non-polar solvents (hexane, octane, or chloroform). The highest photoluminescence quantum yield (PLQY) of the synthesized CsPbX3@zeolite composites can reach 83%, with a lifetime of 1.37 μs. The stability of the CsPbX3@zeolite composites thin film against damage from air and light is significantly improved. We fabricated white light-emitting diodes (WLEDs) using CsPbBr3@zeolite as the green light source and CsPbI3@zeolite as the red light source to further emphasize the practical application effect of the CsPbX3@zeolite composites. This work not only provides a new method for the synthesis of CsPbX3 nanocrystals but also involves the in situ synthesis of high stability CsPbX3@zeolite composites within the zeolite.
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Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 6
·2053-2062
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IF 6.4
Zixuan Huang,Jinju Zheng,Hui Fu,Jialiang Jiang,Zilong Li,Chunhong Gu,Zhentao Du,Yang Yang,Weiyou Yang,Jialong Zhao
Non-toxic lead-free vacancy-ordered double perovskites (DPs) are attracting more and more wide interest, thanks to their environment- and eco-friendly nature with exciting applications in modern optoelectronic devices. However, most intrinsic vacancy-ordered DPs exhibit a simple luminescence mode with poor photoluminescence (PL) quantum yield (QY). Herein, we report the exploration of ns2-type ion (Bi3+ and Sb3+) co-doped vacancy-ordered DP Cs2HfCl6 microcrystals (MCs) by a room-temperature precipitation method. Different to single-dopant analogues, the co-doped DPs deliver dual emission bands, which are sensitive to the excitation wavelength and tunable across the full-color region. It is verified that the emission band peaked at 460 nm should have originated from the triplet self-trapped excitons (STEs) of Bi3+ with a lifetime of hundreds of nanoseconds, while that peaked at 590 nm should be ascribed to the microsecond-timescale STEs of Sb3+, respectively. Accordingly, based on these co-doped DPs, high-performance devices such as multi-color anti-counterfeiting and single-component white light emitting diodes (WLEDs) (CIE = (0.344, 0.337), CRI = 84) have been achieved. Moreover, the as-assembled optical temperature sensor exhibits relative sensitivity (SR) and absolute sensitivity (SA) of 1.2% K−1 and 0.013 K−1, respectively, representing their bright future toward multifunctional optoelectronic applications.
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Jie Xue,Ruyi Song,Zhu Guo,Herman H. Y. Sung,Rolf Lortz,Ian D. Williams,Haipeng Lu
In recent years, the exploration of quantum triangular lattice antiferromagnets has become the subject of intensive research. Within this realm, bilayer triangular lattice antiferromagnets with diverse magnetic exchange interactions have garnered significant interest. In this work, we reported two new bilayer triangular antiferromagnets, Cs3MIFeMnCl9, where M = Na+ and Ag+. The structures of these compounds are derived from the known Cs3Fe2Cl9, featuring a buckled honeycomb structure, where half of Fe3+ are substituted by Mn2+ and the bilayer triangular lattice layers are connected with monovalent Na+ or Ag+ ions. Surprisingly, we found that the band gaps are substantially reduced compared to Cs3Fe2Cl9. Density functional theory (DFT) results attribute this trend to a strong involvement of Mn2+ d-orbitals in the valence band maximum of Cs3MIFeMnCl9. Moreover, magnetic susceptibility measurements demonstrate a stronger magnetic exchange interaction in Cs3MIFeMnCl9, which is modulated by bridging Na+ or Ag+ ions. These findings illustrate an interesting chemical approach for manipulating the electronic and magnetic properties of buckled honeycomb antiferromagnets.
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Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 3
·922-929
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IF 6.4
Xiangshi Bin,Jiaxing Liu,Ruosheng Zeng,Hongbang Liu,Jialong Zhao,Tao Lin
Fast and convenient synthesis of zero-dimensional (0D) cesium-copper(I) halide (Cs3Cu2X5 (X = Cl, I)) single crystals (SCs) is critical to achieve practical radiography. In this study, rapid growth of high-quality Cs3Cu2X5 (X = Cl, I) SCs with sizes reaching centimeter scale were achieved within 24 hours using scalable solution-phased methods. These crystals exhibited highly effective emission with large Stokes shifts, excellent PL linearity, and PLQYs exceeding 86%. Additionally, post-treated Cs3Cu2X5–PMMA films demonstrated outstanding scintillation performance, including excellent stabilities, light yield surpassing 36 000 photons per MeV, and spatial resolution up to 6.5 lp per mm in X-ray imaging tests. The high scintillation efficiency can be attributed to their compact 0D crystalline structure, resulting in a small defect density and strong exciton localization.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yanting Liu,Yanzhu Wang,Lili Meng,Qi Pang,Hua Yao,Qian Chen,Sidi Ye,Yanting Li,Minyi Zheng
Herein, we successfully obtained Ho 3+ and Ag + -codoped Cs 2 NaBiCl 6 halide double perovskites (DPs) via a hydrothermal method , which exhibit orange-red broadband self-trapped excitons (STE) emission and visible (Vis) and near-infrared (NIR) narrow band emission attributed to Ho 3+ f-f transition, under 360 nm excitation. Compared to the single Ho 3+ -doped sample, the Vis PL intensity of the codoped sample was increased by nearly 13.8 times, and an enhanced photoluminescence quantum yield (PLQY) of 87.45 % was achieved. The PL enhancement is attributed to the partial substituting of Na + with Ag + , leading to an efficient STE emission, and the more energy transition from STE to Ho 3+ . Moreover, the synthesized phosphor exhibits good stability in thermal and atmospheric environments. White light-emitting diode (WLED) is fabricated by employing Cs 2 Na 0·997 Ag 0·003 Bi 0.935 Ho 0.065 Cl 6 on near-ultraviolet (n-UV) LED chips, achieving a color rendering index (CRI) of 95.0 and correlated color temperature (CCT) of 3814 K. Anti-counterfeit patterns and the application for night vision monitoring were also discussed. This study inspires the designing of high-quality phosphors of rare earth-doped DPs and expands the multi-domain luminescence applications of halide DPs.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chunli Zhao,Yuan Gao,Jianbei Qiu
Lead-free metal halide perovskites have attracted attention because of their excellent optical properties and nontoxicity. Here, we report the synthesis of Sb3+-doped indium halide perovskite Cs2InCl5·H2O:Sb3+ by an improved solution coprecipitation method. The treatment of the Sb3+-doped indium halide perovskite with selected monovalent cation halides led to Cs2MInCl6 (Ag+, K+, Na+) in different crystal structures or phases. Sb3+ has an isolated ns2 electron, and Sb3+-doped metal halide acts as the luminescence center and exhibits bright broadband emission that originated from self-trapped excitons. Under UV light excitation, these phosphors with different crystal structures emitted multicolored luminescence ranging from blue, green, yellow, and red depending on whether or not or which monovalent metal ion was used. The phosphor samples were used to print high-resolution 2D color barcodes for security and anticounterfeiting applications. The study presented here provides a new approach for the design and synthesis of lead-free metal halide perovskites with different crystal structures and unique optical properties.
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