Nano Research
·
2020
·Vol. 14
·期 5
·1551-1558
·
IF 8.183
Zeng Ruosheng,Bai Kun,Wei Qilin,Chang Tong,Yan Jun,Ke Bao,Huang Jialuo,Wang Liushun,Zhou Weichang,Cao Sheng,Zhao Jialong,Zou Bingsuo
Perovskite variants have attracted wide interest because of the lead-free nature and strong self-trapped exciton (STE) emission. Divalent Sn(II) in CsSnX 3 perovskites is easily oxidized to tetravalent Sn(IV), and the resulted Cs 2 SnCl 6 vacancy-ordered perovskite variant exhibits poor photoluminescence property although it has a direct band gap. Controllable doping is an effective strategy to regulate the optical properties of Cs 2 SnX 6 . Herein, combining the first principles calculation and spectral analysis, we attempted to understand the luminescence mechanism of Te 4+ -doped Cs 2 SnCl 6 lead-free perovskite variants. The chemical potential and defect formation energy are calculated to confirm theoretically the feasible substitutability of tetravalent Te 4+ ions in Cs 2 SnCl 6 lattices for the Sn-site. Through analysis of the absorption, emission/excitation, and time-resolved photoluminescence (PL) spectroscopy, the intense green-yellow emission in Te 4+ :Cs 2 SnCl 6 was considered to originate from the triplet Te(IV) ion 3 P 1 → 1 S 0 STE recombination. Temperature-dependent PL spectra demonstrated the strong electron-phonon coupling that inducing an evident lattice distortion to produce STEs. We further calculated the electronic band structure and molecular orbital levels to reveal the underlying photophysical process. These results will shed light on the doping modulated luminescence properties in stable lead-free Cs 2 MX 6 vacancy-ordered perovskite variants and be helpful to understand the optical properties and physical processes of doped perovskite variants.
研究领域:
材料科学
·
光电学
·
固体物理学
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产品关联
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 10
·2365-2371
·
IF 5
Shaofan Fang,Jinbo Huang,Huixia Li,Jingheng Nie,Zexiang Liu,Feier Fang,Haizhe Zhong
Luminescent metal halides doped with ns2-metal ions, such as 6s2-metal Bi3+, show excellent optoelectronic properties. However, the origin of the high photoluminescence quantum yield (PLQY) of Cs2SnCl6:Bi remains controversial and unclear. In this study, a series of Cs2SnCl6:Bi were synthesized by adopting different tin precursors of SnCl2/SnCl4. The samples from SnCl2 exhibited much higher PLQY than those from SnCl4, and the doping concentrations of Bi3+ had little effect on the high PLQY. When H3PO2 is added to the precursor of SnCl4 to reduce Sn4+ to Sn2+, the prepared Cs2SnCl6:Bi shows bright emission light and high PLQY. The high PLQY of Cs2SnCl6:Bi is attributed to the co-doping of Bi3+ and Sn2+. [SnCl4]2− and two VCl induce a large extra vibrational energy of the heavy localized excitons from [BiCl5]2− to enhance the efficiency of radiative recombination for high PLQY. This work deepens the understanding of the luminescence mechanism of Cs2SnCl6:Bi and supplies significant references for developing more perovskite materials with outstanding luminescence.
研究领域:
材料科学
·
光电
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chao Tan,Weilong Liu,Wenzhuo Li,Hongbo Qi,Xiaojun Zhu,Zhongfang Ji,Jian Cheng,Wenzhi Wu,Qingxin Yang
Appropriately doped lead-free double perovskites (LFDPs) or vacancy-ordered double perovskites (VODPs) exhibit efficient and stable white-light emission via self-trapped excitons (STEs), and therefore hold significant potential for applications in lighting and display technologies. However, the intrinsic luminescence of the host is often disregarded when studying the doped materials because most LFDPs or VODPs possess indirect bandgaps or parity-forbidden transitions from conduction band to valence band. Here, we report a weak warm white light emission from pure Cs2SnCl6 microcrystals, and attribute this emission to the deep trap state according to the observations of absorption and photoluminescence (PL) spectra. The bandgap and structural characteristics of Cs2SnCl6 were further illustrated by analyzing the absorption, PL, Raman spectra and PL dynamics under variable pressure and temperature conditions. The emission mechanism of the deep trap levels in Cs2SnCl6 microcrystals and their potential impact on the STEs emission were discussed based on the spectroscopic observations.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Tianqi Tan,Xuemei Wang,Xi Zhou,Hao Ma,Ruimei Fang,Qin Geng,Fan Dong
In this study, a novel lead-free perovskite heterojunction Cs 2 SnCl 6 /C 3 N 4 composite was constructed and applied for photocatalytic NO purification. After design optimization, the Cs 2 SnCl 6 /C 3 N 4 heterojunction exhibit excellent and stable photocatalytic NO purification ability under visible-light irradiation, which is significantly better than pristine Cs 2 SnCl 6 and C 3 N 4 . Combined in-situ DRIFTS and electron spin resonance spin-trapping, the mechanism of Cs 2 SnCl 6 /C 3 N 4 photocatalytic NO removal was revealed. Under visible-light irradiation, the photo-generated electrons on the conduction band of C 3 N 4 would spontaneously migrate to the CB of Cs 2 SnCl 6 , leaving holes (h + ) on the valence band of C 3 N 4 , contributing to efficiently segregated charge carriers and improved photocatalytic NO purification. Density functional theory calculations also revealed the directional electron transfer at the C 3 N 4 and Cs 2 SnCl 6 interface, in which the charge was migrated from C 3 N 4 to Cs 2 SnCl 6 induced by the internal electric field . This research sheds fresh light on the fabrication of Cs 2 SnCl 6 /C 3 N 4 heterojunctions as well as its effective interfacial charge separation.
研究领域:
材料科学
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光催化
·
环境化学
·
半导体物理
·
计算化学
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DOI
高影响因子
ENERGY & FUELS
·
2026
·
IF 6
Lefei Cao,Fei Qi,Chengfan Fu,Ge Xu,Nan Zhang,Yayun Pu,Xiaosheng Tang,Qiang Huang
Although dielectric barrier discharge (DBD) plasma represents a promising technology for CO2 conversion, its standalone application remains limited by low conversion efficiency, which could be improved via filling a suitable photocatalyst into the plasma reactor. In this paper, the synergistic effect of discharge plasma and Bi12O17Cl2@Cs2SnCl6–Sb0.35 photocatalyst was studied, achieving efficient carbon dioxide conversion. With the help of a photocatalyst, DBD plasma successfully realized the conversion of CO2 and water to CO, methanol, and ethanol. Compared with Cs2SnCl6–Sb0.35, Bi12O17Cl2-10@Cs2SnCl6–Sb0.35 increased methanol and ethanol production by 186 and 80%, respectively. Meanwhile, the conversion of carbon dioxide increased significantly with the presence of water in the plasma-photocatalyst system, achieving a conversion ratio of 35.6%. This boost is attributed to the enhancement of the surface conductivity of the photocatalyst during the plasma discharge, which in turn optimizes the charge transfer process. This paper provides a new idea and a promising technical roadmap for the resource utilization of CO2, which exhibits scientific significance and application potential.
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DOI
高影响因子
International Journal of Applied Glass Science
·
2026
·Vol. 17
·期 3
·e70037
·
IF 2
Wei Han,Wengui Ru,Rugeng Liu,Xiyang Liu,Linghao Hou,Weiqun Shi,Hui He,Mei Li
137 Cs has become one of the key challenges in the dry reprocessing of spent fuel due to its poor separability and high radioactivity. The synthesis of Cs 2 SnCl 6 for the removal of CsCl from waste salts and the preparation of Cs 2 SnCl 6 -glass composites was investigated in this study. The optimal conditions for the hydrothermal synthesis of Cs 2 SnCl 6 are a reaction at 150°C for 6 h, and XRD results indicate that the product is a pure cubic phase. CsCl is removed from LiCl-KCl-CsCl waste salts by the synthesis of Cs 2 SnCl 6 . This method enables efficient and selective separation of Cs + from waste salts with a Cs + content of 2.5–10 wt.%, achieving a removal efficiency of over 96%. The glass composites have a maximum embedding rate of 30 wt.%. Cs + and Cl − are uniformly distributed in the glass matrix, and the glass matrix exhibits good compatibility with Cs 2 SnCl 6 . The PCT test showed that the normalized leaching rates of Cs + and Cl − on the 28th day were as low as 1.6×10 − 4 and 3.4×10 − 4 g·m − 2 ·d − 1 , respectively, demonstrating that the Cs 2 SnCl 6 -glass composite exhibits excellent leaching resistance.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Yihan Liu,Chen Fang,Zhichao Zhang,Kai Liu,Shuxin Wang,Denghui Xu,Yang He,Jun Zhou
Defect engineering provides a promising strategy for modulating the optoelectronic properties of metal halides for versatile photonic applications. However, precise control over defects in metal halides to achieve tunable photoluminescence remains a grand challenge. Herein, a simple yet precise defect engineering strategy based on synthesis-defect-luminescence modulation was proposed to develop Cs 2 SnCl 6 and Cs 2 SnCl 6 :Ln 3+ (Ln = Tb 3+ , Eu 3+ ) perovskite variants as tunable emitters via a combined computational-experimental approach. By controlling the ratio of tin vacancies (V Sn ) and chlorine vacancies (V Cl ), intrinsic Cs 2 SnCl 6 features a tunable emission color from blue to near-white and to yellow, along with a record-high yellow emission (photoluminescence quantum yield, PLQY: 28.76%) and anti-thermal quenching performance, which overcomes the limitation of inefficient and monochromatic emission in traditional Cs 2 SnCl 6 . Moreover, by facilitating more V Cl defects, Cs 2 SnCl 6 :Ln 3+ with stable Ln 3+ doping and remarkably enhanced Ln 3+ emission have been realized through charge-compensation effects. Furthermore, tunable emission from green to red could be realized via energy transfer (ET) from Tb 3+ to Eu 3+ . Finally, we explored potential applications in solid-state lighting and information anti-counterfeiting. Our study not only reveals the intrinsic relationship between defect formation and optical properties in metal halides, but also establishes a rational defect engineering pathway for tuning photophysical properties.
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DOI
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300862
·
IF 13.3
Hong Zhu,Yuexiao Pan,Chengdong Peng,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
Single-component white light emitters based on the all-inorganic perovskites will act as outstanding candidates for applications in solid-state lighting thanks to their abundant energy states for self-trapped excitons (STE) with ultra-high photoluminescence (PL) efficiency. Here, a complementary white light is realized by dual STEs emissions with blue and yellow colors in a single-component perovskite Cs 2 SnCl 6 :La 3+ microcrystal (MC). The dual emission bands centered at 450 and 560 nm are attributed to the intrinsic STE1 emission in host lattice Cs 2 SnCl 6 and the STE2 emission induced by the heterovalent La 3+ doping, respectively. The hue of the white light can be tunable through energy transfer between the two STEs, the variation of excitation wavelength, and the Sn 4+ /Cs + ratios in starting materials. The effects of the doping heterovalent La 3+ ions on the electronic structure and photophysical properties of the Cs 2 SnCl 6 crystals and the created impurity point defect states are investigated by the chemical potentials calculated using density functional theory (DFT) and confirmed by the experimental results. These results provide a facile approach to gaining novel single-component white light emitter and offer fundamental insights into the defect chemistry in the heterovalent ions doped perovskite luminescent crystals.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Powder Materials
·
2025
·
IF 24.9
Rujun Yang,Kunjie Song,Yuantian Zheng,Chenhan Zhan,Yajing Wang,Cunjian Lin,Tianliang Zhou,Yixi Zhuang,Rong-Jun Xie
Persistent Luminescence (PersL) materials, which use traps to store energy and emit photons over a long period, have found important applications in the fields of optical information storage, security labeling, and biological imaging. The trap depth is a crucial factor determining the performance of these materials; however, achieving the desired trap depth with high precision remains a great challenge. Here, we provide double perovskite phosphors (Cs 2 SnCl 6 -Cs 2 ZrCl 6 -Cs 2 HfCl 6 series) with highly compatible crystal structures, enabling continuous and precise tuning of trap depth over an ultra-wide range of 0.11 to 1.25 eV. By incorporating W 4+ as the luminescent centers, these phosphors exhibit outstanding near-infrared (NIR) PersL performance at approximately 900 nm and a lasting emission duration exceeding 10 h. The underlying mechanism of PersL is elucidated, and the wide-range tunability of trap depth is attributed to the universal applicability of band-gap engineering in the entire material system. Furthermore, we demonstrate the practical application of these materials by designing a flexible detector plate for X-ray imaging. The detector plate exhibits a storage time of more than 1 week, a detection limit of 0.83 μGy air ·s -1 in the near-infrared region, and real-time and delay-time imaging resolutions of 14.2 lp·mm -1 and 2.5 lp·mm -1 , respectively. These attributes demonstrate strong potential for X-ray luminescence extension imaging.
研究领域:
材料科学
·
光学材料
·
固体物理
·
纳米技术
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生物医学成像
·
X射线探测
✓ 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）