PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Xiumei Dong,Ruikun Pan
Recently Cu-doped all-inorganic zero-dimensional (0D) metal halides Cs 2 ZnX 4 (X = Cl, Br) have attracted many researchers due to their excellent fluorescence (FL) performance and low toxicity compared to lead-based perovskites . Although these 0D metal halides nanocrystals or small-sized single crystals are prepared via solution methods in most of the reports, we used the solid-state synthesis method to get Cu-doped Cs 2 ZnCl 4 powders and characterized their FL properties. The results and analysis indicate that Cu 2+ can be doped in Cs 2 ZnCl 4 up to 12 at.%, which enhances the FL of Cs 2 ZnCl 4 powder. The photoluminescence quantum yield (PLQY) at 480 nm rises from 1.11 % (undoped) to 20.06 % (6 at.% Cu doping). A modified triplet self-trapped excitons mechanism is presented to explain the enhanced Cu − doped Cs 2 ZnCl 4 powder.
研究领域:
材料科学
·
光学
✓ 已验证
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DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·204-209
·
IF 7.393
Xiaoxia Liu,Chengdong Peng,Lijie Zhang,Daying Guo,Yuexiao Pan
As an all-inorganic zero-dimensional (0D) lead-free metal halide, Cs2ZnCl4 is a potentially excellent matrix for preparing chemically stable and environmentally friendly photoluminescent materials through an ion-doping strategy. Therefore, it is necessary to study the emission properties of every kind of doping ion in the tetrahedral coordination of Cs2ZnCl4. Here, for the first time, we successfully synthesized Te4+-doped Cs2ZnCl4 single crystals via a facile hydrothermal method. X-ray crystallography clearly reveals the strong distortion of the tetrahedral units in Cs2ZnCl4 caused by doping with Te4+. Broadband yellow-light emission covering the range from 450 nm to 700 nm with a large Stokes shift is observed in Cs2ZnCl4:Te4+ single crystals, and this is attributed to self-trapped excitons (STEs) caused by the lattice vibration of the distorted structure. It is worth mentioning that this broadband yellow phosphor can be excited by a wide range of blue light, implicitly giving it an excellent ability to adapt to multiple models of blue LED chips, thus serving as a suitable yellow phosphor that can be applied to fabricate WLEDs without the need to worry about the lack of red light.
研究领域:
材料科学
·
光学
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DOI
高影响因子
DEFECT AND DIFFUSION FORUM
·
2025
·
IF 0
Meng Wang,Chuan Yin
Near-infrared emission has been widely used in night vision and smart devices due to their low thermal effects, non-invasion, and appropriate penetration. As a new generation of luminescent materials, metal halides are considered a promising next-generation near-infrared light source. Zinc-based halides have attracted much attention due to their excellent stabilities, low toxicity, and wide band gaps. However, most zinc-based halides composed of non-optically active [ZnX4]2- units exhibit poor photoluminescence quantum yields (PLQYs). In this paper, Sb3+ ions were doped into Cs2ZnCl4 single crystals to regulate their luminescence properties and investigate corresponding emissive mechanisms. Sb3+-doped Cs2ZnCl4 single crystals exhibit efficient near-infrared emission, which is attributed to the self-trapped excitons emission of Sb3+. The prepared near-infrared LEDs based on Sb3+-doped Cs2ZnCl4 exhibit excellent near-infrared imaging performance, demonstrating the potential application of zinc-based halides in military night vision.
研究领域:
材料科学
·
光电子学
·
固体物理
·
发光材料
✓ 已验证
DOI
Advanced Optical Materials
·
2026
·Vol. 14
·期 36
·e71764
·
IF 7.2
Lumen Chao,Ziyang Bao,Qiang Gu,Xiaoyun Mi,Quansheng Liu
All-inorganic lead-free Cs 2 ZnCl 4 perovskite quantum dots (QDs) attract significant attention due to their non-toxicity and unique optoelectronic properties. However, the yield of Cs 2 ZnCl 4 colloidal QDs synthesized via ligand-assisted reprecipitation (LARP) remains extremely low, and their stability is poor, limiting their applications. Here, we report a post-processing strategy that employs mesoporous nano-SiO 2 to anchor Cs 2 ZnCl 4 QDs within its pores, creating spatial confinement that prevents Cs 2 ZnCl 4 QDs aggregation and quenching while passivating surface defects and reducing non-radiative recombination pathways. This strategy enables the powderization of Cs 2 ZnCl 4 colloidal QDs, and the Cs 2 ZnCl 4 /SiO 2 nano-composite particles (NCP) exhibit bright blue photoluminescence (CIE 0.15, 0.12). Compared to the Cs 2 ZnCl 4 colloidal QDs, the Cs 2 ZnCl 4 /SiO 2 NCP demonstrates a 10 times increase in PL intensity, with a high PLQY (74.28%) and an ultrafast photoluminescence lifetime (2.4 ns). Moreover, due to nano-SiO 2 protection, the Cs 2 ZnCl 4 /SiO 2 NCP exhibits excellent ambient conditions (>6 months, 86.6%) and harsh conditions (temperature, humidity, light, etc.) stability, which is superior to that of other reported halide perovskite QDs. This strategy offers a viable approach to address the challenges of low yield, low photoluminescence efficiency, and poor stability in colloidal perovskite QDs, thereby creating opportunities for their commercial application.
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 11
·期 1
·71-84
·
IF 7
Xing-Yao Zhao,Xiao-Song Zhang,Xiao-Kai Gong,Xiu-Rong Yuan,Min-Xing Chen,Shu-Wei Huang,Bao-zeng Zhou,Jian-Ping Xu,Lan Li
Lead-halide perovskites exhibit excellent photovoltaic properties. However, lead's toxicity and limited stability under ambient conditions limit its further commercialization. This paper reports a Bi3+-doped lead-free metal halide, Cs2ZnCl4:Bi3+ nanocrystals (NCs). After doping with Bi3+, the pristine weakly luminescent nanocrystals showed highly efficient broadband blue emission with a peak position of 445 nm, a full width at half-maximum (FWHM) of 92 nm, and a significant increase in the photoluminescence quantum yield (PLQY) to 57.71%. The formation of a water-induced protective layer of BiOCl ensures good water stability. The luminescence mechanism of Cs2ZnCl4:Bi3+ NCs has been investigated by optical characterization and density-functional theory (DFT) calculations, and it has been concluded that the emission of triple-state self-trapped excitons (STEs) induced by Bi3+ doping is the source of broadband blue light emission. Combining nanocrystals as a luminescence down-shifting (LDS) layer with commercial GaAs solar cell devices has solved the problem of the solar cell's weak absorption of short waves, augmenting the photovoltaic conversion efficiency (PCE) by approximately 1%. Additionally, the integration of Cs2ZnCl4:Bi3+ NCs with 365 nm commercial LED chips enables the creation of broadband blue-emitting LED devices. Therefore, we believe that Cs2ZnCl4:Bi3+ NCs have great potential for future optoelectronic applications.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hailong Yu,Jia Liu,Qichuan Hu,Jing Liu,Wenzhi Wu
Here, we have successfully synthesized manganese (Mn) doped cesium zinc chloride (Cs 2 ZnCl 4 ) crystals for the first time by a simple solvothermal method, which alters the optical properties due to the structural transformation. When Mn 2+ feeding ratio x is lower than 0.4, tetrahedral structure of Cs 2 ZnCl 4 crystals is dominant with green emission of Mn 2+ doping, but both tetrahedral and octahedral structure show green–red emission when Mn 2+ feeding ratio exceeds 0.4. Combining experimental analysis and density functional theory (DFT) calculations, different energy transfer pathways and photoluminescence (PL) emission are revealed. When the host lattice crystal field surroundings of tetrahedral coordination, due to the incorporation of Mn 2+ , the exciton relaxes to 4 T 1 and then transitions to 6 A 1 . However, when the host lattice crystal field surroundings have a strong ligand field strength, the excitons are more advantageously confined to the octahedron. Our work provides deeper insights into the structural transformation of zero-dimensional all-inorganic metal halide due to the Mn 2+ incorporation from doping to substitution of B site.
研究领域:
材料科学
·
光学
·
晶体学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
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