Advanced Optical Materials
·
2021
·Vol. 9
·期 12
·2100434
·
IF 9.926
Xingwen Cheng,Renfu Li,Wei Zheng,Datao Tu,Xiaoying Shang,Zhongliang Gong,Jin Xu,Siyuan Han,Xueyuan Chen
All-inorganic lead-free metal halides doped with ns 2 -metal ions have shown great promise in optoelectronics and photovoltaics owing to their superior optical properties. Herein, a strategy is reported for tailoring the optical properties of 0D A 2 InX 5 ⋅H 2 O and A 3 InX 6 (A = Cs, Rb; X = Cl, Br) crystals via Sb 3+ doping, and the excited-state dynamics of Sb 3+ is unveiled through temperature-dependent photoluminescence (PL) and femtosecond transient absorption spectroscopies. Owing to the spatially confined 0D structure of the In-based halides, Sb 3+ ions experience a strong Jahn–Taller distortion on the excited state, which results in intense PL from Sb 3+ with a broad emission band and a large Stokes shift. Through the control of A cation and the octahedral unit, tunable Sb 3+ emissions (490−750 nm) with PL quantum yields up to 91.8% are achieved in these 0D In-based halides. These findings provide fundamental insights into the excited-state dynamics of Sb 3+ in 0D metal halides, thus laying a foundation for future design of luminescent lead-free 0D metal halides through ns 2 -metal doping towards versatile applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 35
·9071-9076
·
IF 5.236
Zhilin Wang,Xieming Xu,Shuaihua Wang,Hui Xu,Weiwei Xu,Qingyou Zeng,Guoping Deng,Yongzheng Jiang,Shaofan Wu
Graphical Cerium-ion doped lead-free double perovskite crystals (Cs 2 NaTbCl 6 ), were found to have significantly improved sensitivity and the double perovskite crystals (Ce : Cs 2 NaTbCl 6 ) showed excellent ability to resist X-ray radiation damage. In addition the composite film of Ce : Cs 2 NaTbCl 6 crystals can reach a detection limit of 30 nGy ⋅ s −1 of X-ray detector, with the capability to clearly distinguishing the spatial resolution of 10 lp/mm. Scintillators are widely used for nondestructive testing, nuclear medicine imaging, space exploration and security inspection. Recently, lead halide perovskite scintillation crystals have been brought into focus due to their effective atomic number, fast scintillation decay time, strong luminous efficiency, and tunable band gap. However, their application is limited by lead toxicity. Here we report that Ce-doping can increase sensitivity in lead-free double perovskite crystals (Cs 2 NaTbCl 6 ) for X-ray detection and imaging. The introduction of Ce ions as sensitizer can be used to improve the radioluminescence of the crystals. The light output of Ce : Cs 2 NaTbCl 6 crystals is about 52153 ph/MeV, which is 25 % higher than that of un-doped crystal. The X-ray sensitivity is significantly enhanced. Based on our scintillation film X-ray detector the detection limit is 30 nGy ⋅ s −1 , which is about 1/183 of the typical medical imaging dose. Our scintillating film has excellent imaging ability with spatial resolution of up to 10 lp/mm. This research shows that Ce : Cs 2 NaTbCl 6 perovskite crystal scintillators are promising materials for X-ray imaging application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2021
·Vol. 8
·期 12
·3432-3442
·
IF 13.266
Fei Zhang,Xinzhen Ji,Wenqing Liang,Ying Li,Zhuangzhuang Ma,Meng Wang,Yue Wang,Di Wu,Xu Chen,Dongwen Yang,Xinjian Li,Chongxin Shan,Zhifeng Shi
Recently, the newly-emerging lead halide perovskite quantum dots (QDs) have attracted intensive research interest for lighting and display applications owing to their remarkable optoelectronic properties. It is regrettable that the toxicity and instability of lead largely hinder their practical applications. Here, zero-dimensional (0D) cesium indium halide (Cs3InX6) QDs were synthesized for the first time using a modified ligand-assisted reprecipitation method, and the emission wavelength can be tuned facilely via an anion exchange reaction. Typically, the Cs3InBr6 QDs showed broadband blue emission with a high photoluminescence (PL) quantum yield of 46%. First-principles calculations were performed and temperature-dependent PL was studied to investigate the emission mechanisms of the Cs3InBr6 QDs; the 0D nature of Cs3InBr6 enhances the localization of excitons, resulting in a large exciton binding energy. It is worth noting that the strong electron–phonon coupling of Cs3InBr6 indicates that the broadband emission comes from self-trapped exciton emission. Moreover, the Cs3InX6 QDs exhibit excellent stability against moisture, ultraviolet light and heat degradation, significantly better than for conventional lead halide perovskites. Subsequently, the white light-emitting diodes (WLEDs) prepared using blue-emissive Cs3InBr6 QD powder used as the phosphor showed an excellent working stability with a record half-life (T50) of 186 h. Even if the operating temperature is as high as 106.9 °C, the LED can still operate well and reach a T50 of 50 h. These results highlight the huge advantages and application potential of 0D Cs3InX6 QDs as an environmentally friendly emitter in the field of solid-state lighting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 24
·2100815
·
IF 9.926
Yang Liu,Ye Wu,Zhili Juan,Xun Sun,Weiguang Zhang,Haibo Zeng,Xiaoming Li
Single-component materials with efficient, stable, and tunable cold/warm white-light emission are ideal candidates for lighting applications, which can overcome the problems of different deterioration rates and reabsorption effect in conventional mixed-phosphors strategy. Efficient white phosphors based on double halide perovskite have been reported via manipulating the parity transitions recently. However, the emission wavelength is nonadjustable. Herein, a lead-free double perovskite Cs 2 Zr 1− x Te x Cl 6 that exhibits efficient and stable white-light emission is reported. The introduction of Te 4+ results in bright self-trapped exciton (STE) emission, which endows Cs 2 ZrCl 6 matrix with multiple luminescent centers. Efficient white luminescence with tunable color temperature and high photoluminescence quantum yield (PLQY) of 61.5% (under 254 nm, CCT = 4039 K) and 96.1% (under 365 nm, CCT = 3313 K) is achieved. Efficient energy transfer between multiple luminescent centers and appropriate doping concentrations are the key points to achieve such highly efficient and tunable white emission. The as-synthesized Cs 2 Zr 1− x Te x Cl 6 composites exhibit a robust stability against heat, ultraviolet light, and environmental oxygen/moisture, which show little spectra variation with less than ≈ 20% efficiency loss after 980 h testing even under high temperature and UV light. These results indicate Cs 2 Zr 1− x Te x Cl 6 are promising single-component white-light-emitting phosphors for next-generation lighting and display technologies.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Tao Huang,Dongping Song,Lulu Zhou,Hui Tao,Aiyin Li,Shu-wen Zhang,Long-fei Liu
The natural ecosystem will continually deteriorate for decades by the leakage of Cs and Sr isotopes. The exploration of the new materials or techniques for the efficient treatment of radioactive wastewater is critically important. In this study, a dielectric barrier discharge (DBD) configuration was constructed to operate the non-thermal plasma (NTP). The NTP was incorporated into the synthesis of polyaluminum chloride (PAC) in two different procedures to intensify the synthesis of PAC (NTP-PAC) and enhance the further removal of Cs and Sr from wastewater. The employment of NTP in two procedures both had significantly changed the physicochemical characteristics of PAC materials, which facilitated the further adsorption application of NTP-PAC on the treatment of Cs + and Sr 2+ . Different molecular, morphological, and adsorption characteristics were confirmed to the NTP-PAC materials. The heterogeneous adsorption of the NTP-PAC can be appropriately fitted by both the pseudo-first-order kinetic model and the Elovich model. Both physisorption and chemisorption reaction mechanisms were ensured for the heterogeneous adsorption of the NTP-PAC material towards Cs + and Sr 2+ , which guaranteed the excellent adsorption performance of NTP-PAC materials compared to PAC. The electron collisions caused by NTP with alum pulp created highly reactive growth precursors and intensified the nucleation and hydrolysis polymerization of PAC. The employment of NTP explicitly broadens the reaction pathways between PAC and cationic contaminants in the aqueous environment, which expands the application area of PAC materials in environmental sustainability.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Photonics Research
·
2021
·Vol. 2
·期 12
·2100143
·
IF 0
Bo Zhou,Zexiang Liu,Henan Li,Shaofan Fang,Feier Fang,Ye Wang,Fuming Chen,Yumeng Shi
Inorganic indium-based halide double perovskites (DPs) are environmentally friendly alternatives to lead-based halide perovskites in light-emitting diodes, but commonly suffer from low quantum efficiency and harsh synthesis conditions. Herein, a large-scale green method using water as solvent is developed for the synthesis of 3D Cs 2 NaInCl 6 and 0D Cs 2 InCl 5 ·H 2 O with/without Sb 3+ dopant at room temperature. The transformation between Cs 2 InCl 5 ·H 2 O and Cs 2 NaInCl 6 products is controlled by the concentration of eco-friendly NaCl, where excess Cl − and Na + ions play important roles in inhibiting In 3+ hydrolysis and promoting Cs 2 NaInCl 6 crystallization, respectively. The obtained Cs 2 NaInCl 6 :Sb and Cs 2 InCl 5 ·H 2 O:Sb exhibit highly luminescent self-trapped exciton-related blue (450 nm; photoluminescence quantum yield [PLQY] ≈85%) and yellow (610 nm; PLQY ≈88%) emissions, which are comparable to those obtained by previous methods. Tunable cold/warm white light with a PLQY of up to ≈73% is achieved by the rational assembly of two components with highly overlapped excitation wavelength ranges. Each component demonstrates remarkable stability against humidity and heat. This composite shows great potential in solid-state lighting for general illumination.
✓ 已验证
产品关联
DOI
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Sen Yang,Shunfa Gong,Zhilong Zhou,Lifang Wu,Minmin Zhang,Lilin Jiang,Wenzhi Wu
The optical and thermometric properties of bismuth (Bi) and ytterbium (Yb) codoped double perovskite Cs2Ag0.6Na0.4InCl6 microcrystals (MCs) are investigated, which possess high photoluminescence quantum yield and stable broadband spectra from visible to near-infrared (NIR) region. Thermal quenching and dynamic properties are shown using temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL) techniques, which reveal the transition mechanism from self-trapped excitons (STEs) to Yb dopants. Taking advantage of the diverse thermal quenching of distinct PL between STEs and Yb3+ emissions, an optical thermometer based on the fluorescence intensity ratio is designed in the visible and NIR region, which can provide a self-referenced temperature with high sensitivity. The maximum absolute and relative sensor sensitivities are 0.113 K–1 and 1.66% K–1, respectively. These characteristics all demonstrate that Bi/Yb codoped Cs2Ag0.6Na0.4InCl6 MCs can be excellent and novel luminescent materials for non-contact temperature measurement.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 17
·10075-10082
·
IF 3.361
Zhiming Wang,Long Wang,Cuo Zhou,Chunyan Sun
A potentiometric sensor, based on the glassy carbon electrode (GCE) modified with a magnetic multi-walled carbon nanotubes/cesium ion-imprinted polymer composite (MMWCNTs@Cs-IIP), is introduced for the detection of cesium(I). The IIP was synthesized using cesium ions as the template ions, chitosan as the functional monomer and glutaraldehyde as the cross-linking agent. The membrane, which was coated on the surface of the GCE, was prepared using MMWCNTs@Cs(I)-IIP as the modifier, PVC as the neutral carrier, 2-nitrophenyloctyl ether as the plasticizer and sodium tetraphenylborate as the lipophilic salt. The proposed sensor exhibited a Nernstian slope of 0.05954 V dec−1 in a working concentration range of 1 × 10−7 to 1 × 10−4 M (mol L−1) with a detection limit of 4 × 10−8 M. The sensor exhibited high selectivity for cesium ions and was successfully applied for the determination of Cs(I) in real samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yandong Ren,Shuchen Lü
Copper(I) halides have recently attracted increasing attention in a variety of photonics applications, owing to their highly luminescent efficiency, nontoxicity, and low-dimensional electronic structure. Moreover, combining compositional engineering and mass production of new materials may further enrich the research and application of functional materials. Herein, we controllably synthesized two series of novel mixed-halide Cs 3 Cu 2 Cl 5-x I x and Cs 5 Cu 3 Cl 8-x I x powders via the compositional engineering for the first time. The crystal structures are identified with Rietveld refinement and density functional theory calculations. The mixed-halide compound exhibits relatively wide full width of half-maximum (~70 nm), adjustable bandgap (from 449 nm to 486 nm), larger Stokes shifts (~200 nm), and dramatic improved stability with high efficiency (photoluminescence quantum yield at least 90.61%), which present a scalable strategy for mass production for practical applications. In addition, the controllable phase transformation from blue-emitting Cs 3 Cu 2 I 5 to yellow-emitting CsCu 2 I 3 was confirmed. Most notably, the white light is obtained by combining novel Cs 3 Cu 2 Cl 5-x I x /Cs 5 Cu 3 Cl 8-x I x with yellow-emitting CsCu 2 I 3 powders. Based on this, we firstly introduce the blue-emitting Cs 5 Cu 3 Cl 7 I powders in white LED fabrication by combining ultraviolet chip and as-prepared yellow-emitting CsCu 2 I 3 powders, to generate high-quality and stability white light with CIE coordinates of (0.335, 0.398) and colour rendering index value of 77.8. For comparison, red-emitting CaAlSiN 3 :Eu 2+ phosphors are also introduced for LED package to substitute CsCu 2 I 3 powders, which exhibit the high colour rendering index of 89.2. This work not only develops new mixed-halide compounds with high stability and performance, but also provides the unique strategy for promoting industrialization process of LED backlights.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Qiaohui Liao,Qian Meng,Liang Jing,Jiamin Pang,Qi Pang,Jin Zhong Zhang
In this study, a facile approach is used to enhance the broad orange emission efficiency and stability as well as monodispersity of Cs2AgInCl6 nanocrystals (NCs) via doping Bi3+ and surface passivation with potassium bromide. While the pristine Cs2AgInCl6 NCs show an excitonic absorption peak at 280 nm, the doped NCs have an additional absorption peak at 365 nm, which is attributed to direct bismuth s–p transition. Compared to the low photoluminescence (PL) quantum yield (QY) of 0.04% for the pristine Cs2AgInCl6 NCs due to parity forbidden transition, the doped NCs show a PLQY of 5.82%, a significant improvement due to breaking of the parity forbidden transition. The PLQY can be further increased to 8.59% for Cs2AgIn0.9Bi0.1Cl6 when passivated with KBr. This work demonstrates that the combination of doping and surface passivation can substantially improve the PL of the Cs2AgInCl6 double perovskite. A model is proposed to explain the observed enhancement in PL and stability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuan Shu,Xiaolan Duan,Qiang Niu,Rongyong Xie,Pengfei Zhang,Yunxiang Pan,Zifeng Ma
Zinc oxide is a key material in catalysis. Designing of ZnO crystal aggregates with the surface defect has received significant attention. Herein, we synthesized ZnO aggregates with tiny primary nanoparticles through a mechanochemistry-assisted salt-templating (potassium chloride) method. Interestingly, this KCl-templating strategy could lead to significant increase in specific surface area (SSA) of ZnO (up to 91 m 2 /g), whereas commercial ZnO-COM has a SSA of 5 m 2 /g. Meanwhile, this strategy via ZnCl 2 -KCl solid solution has also created a number of oxygen vacancies into ZnO aggregates. With these attractive features, as-made Pd-ZnO catalyst showed outstanding performance in methanol steam reforming, especially at low temperature (20 % Conversion and 95 % CO 2 Selectivity at 150 °C). Current strategy provides a gateway for the rational design of ZnO-based catalytic materials.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Lidan Zhao,Xinlian Chen,Jiaxing Fu,Chang Xue,Mengying Zhang,Weijia Wen,Jinbo Wu
Segregation is a phenomenon of inhomogeneous distribution of constituent elements during crystallization and could be found in alloy, polymers, colloid, etc. Some researchers have also found component segregation in perovskite crystals. Until now, the existing research reports are all about the halogen segregation of perovskite at the micro level, while the research about the component segregation of perovskite at the macro level is blank, leaving no relevant application developed. Therefore, we can broaden the PUFs-based application of perovskite crystals by employing the multi-wavelength emission property arising from component macrosegregation. We synthesized perovskite crystal arrays with macroscopic composition segregation in one step by surface-tension-confined evaporative self-assembly. The macrosegregation in perovskite crystals prepared with different halogen ratios and temperature was surveyed. The photoluminescence spectra of perovskite crystals were investigated. Perovskite crystals with composition segregation could generate physically unclonable cryptographic primitives, which were made by a simple and random process and difficult to replicate. According to the number of peaks in the spectrum, we converted the optical response into quaternary cryptographic keys, and demonstrated the randomness and stability of the system. This study excavated the application prospect of macroscopic component segregation perovskite in all-photonic cryptographic primitives.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）