OPTICAL MATERIALS
·
2023
·
IF 3.9
Qun Jing,Menglin Zhu,Lu Li,Xu Ji,Haiming Duan,Henglei Chen,Ming-Hsien Lee
In recent years, phosphates have become a research hotspot to explore new ultraviolet (UV) nonlinear optical (NLO) materials. Herein, two NLO materials MZnPO 4 (M = Rb, Cs) are synthesized by cation substitution in alkali-zinc orthophosphates. Although they crystallize in different space groups P 2 1 and Imm 2, respectively, they both have a honeycomb-like topological structure consisting of corner-shared PO 4 and ZnO 4 tetrahedra and separated by "M" cations. Two compounds exhibit mild powder second harmonic generation (SHG) responses (1.2 and 0.5 × KDP for RbZnPO 4 and CsZnPO 4 , respectively) with type I phase matching behaviors and short absorption edges (226 nm for RbZnPO 4 and 231 nm for CsZnPO 4 ). Furthermore, their thermal properties , infrared (IR) spectra and theoretical calculations are also mentioned in the paper. The synthesis and structure-property relationship described in the system will enable discovery of new NLO materials.
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Nanoscale
·
2018
·Vol. 10
·期 7
·3429-3437
·
IF 7.233
Hao Wu,Yong Yang,Dacheng Zhou,Kuangran Li,Jie Yu,Jin Han,Zhencai Li,Zhangwen Long,Jiao Ma,Jianbei Qiu
All-inorganic metal halide perovskites of the formulation ABX3 (where A is Cs+, B is commonly Pb2+, and X is a halide, X = Cl, Br, I) have been studied intensively for their unique properties. Most of the current studies focus on halogen exchange to modify the luminescence band gap. Herein we demonstrate a new avenue for changing the band gap of halide perovskites by designing mixed-monovalent cation perovskite-based colloidal quantum dot materials. We have synthesized monodisperse colloidal quantum dots of all-inorganic rubidium–cesium lead halide perovskites (APbBr3, A = mixed monovalent cation systems Rb/Cs) using inexpensive commercial precursors. Through the compositional modulation, the band gap and emission spectra are readily tunable over the visible spectral range of 474–532 nm. The photoluminescence (PL) of RbxCs1−xPbBr3 nanocrystals is characterized with excellent (NTCS color standard) wide color gamut coverage, which is similar to the cesium lead halide perovskites (CsPbX3, X = mixed halide systems Cl/Br), and narrow emission line-widths of 27–34 nm. Furthermore, simulated lattice models and band structures are used to explain the band gap variations.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿半导体
·
量子点
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiarong Lv,Yanyan Qian,Yuetong Zhu,Qun Jing,Xinmei Wang,Zhaohui Chen
Two deep-ultraviolet (DUV) transparent nonlinear optical (NLO) materials, AAl 3 P 6 O 20 (A = Rb, Cs) ( I, II ), have been elaborately designed from Ba 5 P 6 O 20 by aliovalent substitution strategy. Both of compounds crystallize in noncentrosymmetric (NCS) C222 1 (No. 20) space group with three-dimensional (3D) ∞ 3 Al 3 P 6 O 20 skeleton. The cutoff edges of I and II are lower than 190 nm, which are the shortest ones among the reported Al-based phosphates. In addition, their syntheses, thermal properties, NLO performances are discussed and the first-principles calculation elucidates the origin of the optical properties . This study shows that aliovalent substitution is an effective synthetic route for designing DUV transparent Al-based phosphates NLO materials.
研究领域:
材料科学
·
光学
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yongqiang Ji,Minqiang Wang,Zhi Yang,Hao Wang,Muhammad Amin Padhiar,Jindou Shi,Hengwei Qiu,Arshad Saleem Bhatti
Among the lead halide perovskites, the stability of red-emitting CsPbBrI2 perovskite quantum dots (PQDs) is very poor. This is an impediment to the development of high purity white emitting diodes (WLEDs) based on PQDs. Herein, we surprisingly find that luminescent properties of CsPbBrI2 PQDs can be significantly improved through doping of univalent Rb+ ions, especially when molar ratio of Rb+/Cs+ = 0.1/0.9. Subsequently, these red emitting Rb0.1Cs0.9PbBrI2 PQDs are successfully coated with TiO2 through an easy in situ strategy of adding titanium(IV) butoxide (TBO) to the precursor. Benefiting from the efficient protection of TiO2 nanoshell, these highly fluorescent Rb0.1Cs0.9PbBrI2/TiO2 nanocomposites can preserve their excellent red emitting characteristics even when directly immersed in water or exposed to illumination, enabling us to build highly stable WLEDs with color coordinates at (0.342, 0.325).
研究领域:
材料科学
·
光学工程
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高影响因子
INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 29
·17206-17214
·
IF 4.6
Zhang Yanjiao,Gong Pifu,Chen Mingxing,Wang Zhigang,Wang Xinfang,Qi Man,Han Yunhua,Jia Zhen,Xia Mingjun
Tunable fluorescence emission endows luminescent materials
with
immense applications in optoelectronic devices and information security.
Herein, broad-wavelength photoluminescence (PL) tuning from yellow
to white to blue is realized in a zero-dimensional (0D) K 4 CdCl 6 halide via a facile Rb/Sn codoping strategy. Interestingly,
K 4 CdCl 6 and isostructural Rb 4 CdCl 6 halides exhibit yellow and blue PL emissions via the homovalent
doping of Sn 2+ , respectively. The relative intensity ratio
of yellow and blue emission bands can be effectively regulated in
K 4 CdCl 6 :Sn 2+ halides by Rb + alloying; accordingly, the continuous luminescence color tuning
covering yellow, white, and blue spectral regions was successfully
achieved. Density functional theory calculations further verify that
the doping of Sn 2+ leads to the appearance of an impurity
energy level within the band gap, accelerates electronic transitions,
and ultimately enhances PL emission efficiency. On the basis of this
rationally designed tunable luminescent system, the three-level color-coded
intelligent password devices, combining multimode optical anticounterfeiting
and digital information encryption, were developed. This work not
only develops a reliable ion doping strategy for luminescence modulation
in the metal halides but also expands their diversified application
prospects in advanced optoelectronic fields.
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MINERALS ENGINEERING
·
2026
·
IF 6
Kun Xu,Mingming Yu,Heyue Niu,Yusufujiang Mubula,Zhehan Zhu,Di Han,Jingzhong Kuang,Lingguo Meng,Guichun He
Lepidolite, a critical mineral resource, contains lithium (Li), rubidium (Rb), and cesium (Cs) — indispensable core elements for modern industrial development. This study proposes a novel “calcining-electric field enhanced alkaline leaching” process for the simultaneous extraction of Li, Rb, and Cs from lepidolite. Under the calcination conditions (850 °C, 120 min) and optimal alkaline leaching parameters (70 wt% NaOH initial concentration, 4:1 liquid–solid ratio, 180 °C, 6 h, 100 r/min stirring speed, and 1.1 A/cm 2 current density), the leaching efficiencies of Li, Rb, and Cs reach 94.3%, 95.2%, and 92.6%, respectively. Compared with the traditional alkaline leaching without an electric field, the proposed method improves the leaching rates of Li, Rb, and Cs by 5.2%, 1.0%, and 11.3%, respectively, under the combined effects of external electric field and alkaline medium. Combined with phase analysis, micro-morphology characterization, surface element content determination, and reactive oxygen species (ROS) quantitative analysis via XRD, SEM, EDS, and UV–Vis characterizations, the core mechanism is revealed: the external electric field induces in-situ formation of stable ROS in the alkaline medium, which effectively destroys the surface and layered structure of calcined lepidolite concentrate, accelerates the oxidative decomposition of ionic bonds in polymetallic silicates and uniform substitution on the mineral surface, exacerbates lattice distortion and internal structure damage, promotes phase transformation of polymetallic silicates, and enhances the conversion of Li, Rb, and Cs to soluble hydroxides, ultimately realizing the directional phase reconstruction of lepidolite concentrate from primary aluminosilicate to soluble hydroxide phases.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Hussin Elkik,Muhammad Mujahid Iqbal,Aqsa Munawar,Zhihua Yang,Fangfang Zhang,Shilie Pan
The progress of all-inorganic Ruddlesden–Popper (RP) perovskites broadens the selection of materials suitable for optoelectronic applications, especially in improving stability and performance. Two new alkali metal calcium halide nitrate-based layered RP perovskite variants, Rb2Ca(NO3)2Cl2 and Cs2Ca(NO3)2Cl2, have been synthesized through a facile solution evaporation method. Remarkably, the title compounds exhibit a unique RP perovskite-like nitrate layered structure with significant birefringence (0.099–0.104@546 nm) and short ultraviolet (UV) absorption wavelengths (220–225 nm). In-depth structural investigation and theoretical analyses indicate that the birefringence substantially arises from the planar triangular [NO3] groups. This study not only enhances the structural diversity of layered perovskites but also provides an effective strategy for the continued investigation of all-inorganic birefringent optical materials in the UV region.
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INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Zhaohui Chen,Yuan Fang,Wenyao Zhang,Wenqiang Chen,Xuefang Lu,Qun Jing,Ming-Hsien Lee
Two new isotypic diphosphates, RbLiZnP2O7 (RLZP) and CsLiZnP2O7 (CLZP), have been synthesized by a high-temperature solid-phase method. They both crystallize in the Pnma space group (No. 62) and have similar crystal configurations. ALiZnP2O7 (A = Rb, Cs) consists of a [Li2Zn2P4O20]14– anionic skeleton, which is composed of Li/ZnO4 tetrahedral and diphosphate groups, and the Rb or Cs atoms are located in the large hole. In this paper, we discuss the structures of the title compounds and isonomic AA′ZnP2O7 (A = alkali metal); it is found that the ionic radii of the cations and bond angles have an effect on the symmetry of the compounds. By analysis, we found that the M/P values have some effect on the dimensionality of the anionic groups in phosphates containing P2O7 groups. Thermal and spectral analyses are carried out on the title compounds. Besides that mentioned above, we also studied the relationship between the electronic structures and optical properties by theoretical calculations.
研究领域:
无机化学
·
材料科学
·
固态化学
·
晶体学
·
光学材料
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Science China-Materials
·
2020
·Vol. 63
·期 9
·1769-1778
·
IF 6.098
Xu Jingjing,Wu Hongping,Yu Hongwei,Hu Zhanggui,Wang Jiyang,Wu Yicheng
Alike phosphates, silicates and germanates exclusively containing tetrahedral basic building units (BBUs) can also exhibit ultraviolet (UV) even deep-UV transitions. They are important for the design of new UV or deep-UV nonlinear optical (NLO) materials. In this paper, four new alkali metal silicates and germanates, Li 2 Rb 4 Si 6 O 15 , Li 2 Cs 4 Si 6 O 15 , Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 were successfully synthesized by a high temperature solid state reaction. They obey the general formula of Li m A n M 6 O 15 (A=Rb, Cs; M=Si, Ge; m+n =6) and all exhibit the Sr 2 Be 2 B 2 O 7 (SBBO)-like structures. More importantly, Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 crystallize in the noncentrosymmetric (NCS) structures and exhibit remarkable phase-matched second harmonic generation (SHG) effect, 0.8×KH 2 PO 4 (KDP) and 1×KDP, respectively. These indicate that they are potential as UV or deep-UV NLO materials. Furthermore, their optical and NLO properties as well as thermal properties were measured. The structure-property relationships were studied by the dipole moment calculations and the first-principles calculations.
研究领域:
材料科学
·
无机化学
·
光学材料
·
固态化学
·
非线性光学
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Hai Li,Jiahao Huang,Xin Tan,Xiaofang Lai,Jun Deng,Duan Zhao,Shaoming Zeng,Jikang Jian
Three layered quaternary sulfides, A CuZnS 2 ( A = K, Rb, Cs) have been synthesized by a facile solvothermal method using ethylenediamine as solvent and characterized by a combination of structural, magnetic, and optical measurements . They adopt the ThCr 2 Si 2 -type structure (space group I 4/ mmm ) and are composed of alternating two-dimensional [CuZnS 2 ] −1 layers and alkali metal layers. Based on magnetization and optical measurements, these three compounds are found to be paramagnetic semiconductors. The optical band gap is around 2.75 eV and for the first time two photoluminescence bands are observed for each compound. The green luminescence can be ascribed to a localized Cu + emitting level and the red one to an excitonic state.
研究领域:
材料科学
·
无机化学
·
固态化学
·
光电材料
·
光物理
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Mengran Sun,Wenhao Xing,Shyong K. Chen,Chunxiao Li,Wenhao Liu,Ming-Hsien Lee,Jiyong Yao
Chalcogenides are promising candidates for exploring mid- and far-infrared nonlinear optical (NLO) materials. Nevertheless, although tellurides possess greater advantages in the above-mentioned spectral regions, the reports on telluride NLO materials are far fewer than those on sulfides and selenides. In this work, a new quaternary NLO-active telluride, KCd4Ga5Te12, was discovered, and its Rb and Cs analogues were successfully synthesized. They are crystallized in the trigonal R3 space group and the structure features a 3D diamond-like framework constructed by vertex-sharing asymmetric MTe4 tetrahedra (centered by disordered Cd and Ga) that are stacked along the c-axis. Moreover, a comprehensive study of their IR NLO properties, photoluminescence properties, and structural features was performed. These compounds exhibited large powder second-harmonic generation (SHG) intensities, about 2.1 (2.7, 4.4) times that of AgGaSe2 in the particle size range of 20–50 (125–150) μm and a wide transmission range (∼25 μm). The SHG-density analysis revealed that the largest component χ333(2) of KCd4Ga5Te12 originates from three types of Te in the crystal structure. More importantly, it is rare in literature to demonstrate the consistency of linear and NLO properties calculated using both ultrasoft pseudopotentials and norm-conservation pseudopotentials. Besides, the title compounds also exhibit strong luminescence emissions around 420 and 470 nm at 298 K. This work implies that title compounds are promising candidates in the IR NLO applications.
研究领域:
材料科学
·
光学
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高影响因子
Nature Nanotechnology
·
2025
·
IF 34.9
Teng Zhenyuan,Zhang Zhenzong,Tu Ying,Zhang Qitao,Jian Nan,Yang Liujun,Xiao Jiadong,Ding Jie,Huang Longzhen,Teruhsia Ohno,Wang Chengyin,Zhang Dengsong,Yu Han,Lu Jianmei,Su Chenliang,Liu Bin
Selective asymmetric oxidation of glycerol (GLY) to hydroxypyruvic acid (HPA) offers an attractive approach for chiral drug synthesis, but this process is highly challenging. Here we develop a photocatalytic method to achieve heterogeneous selective photooxidation of GLY to HPA over rubidium (Rb) and iridium (Ir) catalytic pairs decorated on a poly(heptazine imide) framework. The Rb sites effectively adsorb GLY molecules through the terminal –OH groups, thus inhibiting their oxidation during photoreaction, while the Ir sites enhance the oxygen reduction reaction and the in situ generated surficial oxygen-reduction radicals on Ir can protect the reactive C-centred radical intermediates produced during photooxidation. The spatial arrangement of Rb and Ir sites facilitates hydrogen extraction—an essential rate-determining step for GLY photooxidation—and protects C3 radical intermediates from overoxidation. This photocatalytic system achieves a remarkable productivity for HPA synthesis (~8,000 μmol of HPA per gram of photocatalyst per hour) under visible-light illumination.
研究领域:
化学工程
·
材料科学
·
光催化
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