APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chunyu Sun,Xinzhan Wang,Yanmei Xu,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
CsPbI 3 nanocrystals (NCs) with photoluminescence quantum yield (PLQY) larger than 90% have been synthesized at different temperature regions, and the physical origins for high PLQY were investigated. HRTEM images show that cubic phase CsPbI 3 (α-CsPbI 3 ) is surrounded by hexagonal Cs 4 PbI 6 in the low temperature region, and the ratio of CsPbI 3 and Cs 4 PbI 6 increases with increasing the reaction temperature. The strong confinement effect of Cs 4 PbI 6 leads to the high PLQY (95%) of α-CsPbI 3 NCs when the reaction temperature is 120 °C. The confinement effect of Cs 4 PbI 6 is weakened with increasing reaction temperature, which leads to the decrease of PLQY at 140 °C. However, non-radiative recombination is suppressed due to the microstructure improvement with further increasing the reaction temperature, and PLQY as high as 97% is achieved at 180 °C. Stability testing shows that fast degradation of α-CsPbI 3 NCs occur in low reaction temperature region, and α-CsPbI 3 NCs with high PLQY can be stored in air for 90 days when the reaction temperature is 180 °C.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2017
·
IF 13.942
Jian Zhang,Ying Yang,Hui Deng,Umar Farooq,Xiaokun Yang,Jahangeer Khan,Jiang Tang,Haisheng Song
Colloidal quantum dots (QDs) of lead halide perovskite have recently received great attention owing to their remarkable performances in optoelectronic applications. However, their wide applications are hindered from toxic lead element, which is not environment- and consumer-friendly. Herein, we utilized heterovalent substitution of divalent lead (Pb2+) with trivalent antimony (Sb3+) to synthesize stable and brightly luminescent Cs3Sb2Br9 QDs. The lead-free, full-inorganic QDs were fabricated by a modified ligand-assisted reprecipitation strategy. A photoluminescence quantum yield (PLQY) was determined to be 46% at 410 nm, which was superior to that of other reported halide perovskite QDs. The PL enhancement mechanism was unraveled by surface composition derived quantum-well band structure and their large exciton binding energy. The Br-rich surface and the observed 530 meV exciton binding energy were proposed to guarantee the efficient radiative recombination. In addition, we can also tune the inorganic perovskite QD (Cs3Sb2X9) emission wavelength from 370 to 560 nm via anion exchange reactions. The developed full-inorganic lead-free Sb-perovskite QDs with high PLQY and stable emission promise great potential for efficient emission candidates.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 19
·2723
·
IF 5.3
Yanran Wang,Ming-yu Li,Shijie Liu,Yuan Ma,Bo Sun,Liangyu Wang,Haifei Lu,Xiaoyan Wen,Sisi Liu,Xumin Ding
Perovskite quantum dots (QDs), emerging with excellent bright-green photoluminescence (PL) and a large absorption coefficient, are of great potential for the fabrication of light sources in underwater optical wireless communication systems. However, the instability caused by low formation energy and abundant surface traps is still a major concern for perovskite-based light sources in underwater conditions. Herein, we propose ultra-stable zero dimensional–two dimensional (0D–2D) CsPbBr3QD/1,4-bis(4-methylstyryl)benzene (p-MSB) nanoplate (NP) heterostructures synthesized via a facile approach at room temperature in air. CsPbBr3QDs can naturally nucleate on thep-MSB NP toluene solution, and the radiative combination is drastically intensified owing to the electron transfer within the typical type-II heterostructures, leading to a sharply increased PLQY of the heterostructure thin films up to 200% compared with the pristine sample. The passivation of defects within CsPbBr3QDs can be effectively realized with the existence ofp-MSB NPs, and thus the obviously improved PL is steadily witnessed in an ambient atmosphere and thermal environment. Meanwhile, the enhanced humidity stability and a peak EQE of 9.67% suggests a synergetic strategy for concurrently addressing the knotty problems on unsatisfied luminous efficiency and stability of perovskites for high-performance green-emitting optoelectronic devices in underwater applications.Keywords:perovskite quantum dots;p-MSB nanoplate;typical type-II heterostructure;high photoluminescence quantum yield;moisture stability
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2002130
·
IF 9.926
Qinggang Zhang,Weilin Zheng,Qun Wan,Mingming Liu,Xiuping Feng,Long Kong,Liang Li
For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr 3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr 3 /MS@SiO 2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2025
·
IF 1.1
Qiuhong Chen,Liyan Wu,Weiyuan Luo,Wenjian Pan,Shuang Zhang,Liping Sun,Meng Zeng
CsPbI 3 perovskite nanocrystals (NCs) are emerged as promising materials for optoelectronic devices because of their superior optical properties. However, the brightness of the deep red fluorescence does not satisfy the requirements of outdoor displays. Herein, we report an effective strategy of Zn 2+ -assisted passivation to obtain pure red fluorescence and narrow emission CsPbI 3 NCs at a modified hot-injection method. It is found that the introduced Zn 2+ ions are successfully doped into the NCs lattice to replace some Pb 2+ ions for passivating some defects, increasing the radiative recombination rate and decreasing the nonradiative recombination rate. As a result, the as-prepared Zn 2+ -treated CsPbI 3 (Zn-CsPbI 3 ) have a luminescence peak position at 635 nm and narrow full width at half maximum of only 29.8 nm, with photoluminescence quantum yield (PLQY) up to 81%, which is 30% higher than the pristine NCs. Meanwhile, the structure of the Zn-CsPbI 3 NCs is orthorhombic (γ) phases, and their morphology is a uniformly distributed hexagonal crystal system.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
钙钛矿纳米材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chuxiong Zhou,Yujun Zhou,Ou Xu,Linghang Kong,Wei Tian,Xuda Kan,Tao Huang,Bingsuo Zou
To date, Cu(I)-based metal halides with high photoluminescence quantum yields (PLQYs) have primarily focused on their zero-dimensional or one-dimensional structures, significantly reflecting the charge or carrier localization. Designing two-dimensional (2D) hybrid copper(I) halides remains a significant challenge for optoelectronic applications, particularly in simultaneously achieving high PLQY and exceptional structural stability. Here, we report a novel series of 2D hybrid Cu(I) halides, (TDMP)Cu2X4 (TDMP = 2,5-dimethylpiperazine and X = Cl, Br), synthesized through simple solution-cooling crystallization methods. (TDMP)Cu2Cl4 and (TDMP)Cu2Br4 emit cyan and blue light with PLQYs of 94.3 and 71.7%, respectively. According to the literature, the 94.3% represent the highest PLQYs reported for 2D Cu(I)-based hybrid materials. Interestingly, (TDMP)Cu2Cl4 demonstrates excellent water stability, retaining its efficient emission properties even after prolonged exposure to water. Furthermore, the scintillation screen based on (TDMP)Cu2Cl4 exhibits promising X-ray scintillation performance, with a low detection limit of 127 nGairy s–1 and a high resolution of 16.5 lp mm–1, significantly outperforming commercially available materials. This study provides a strategy for designing high-performance 2D Cu(I)-based metal halides and X-ray imaging materials.
研究领域:
材料科学
·
无机化学
·
光学材料
·
核医学成像
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半导体物理
·
功能晶体材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Na Lin,Li Xiao,Yishi Wu,Yi-Fan Wu,Zi-Xian Li,Tian-Yu Yan,Zhi-Wei Chen,Cheng-Yang Yue,Dongpeng Yan,Xiao-Wu Lei
Excitation- and temperature-dependent multicolor luminescent materials are valuable in advanced optoelectronic devices while they haven't been realized in 2D metal halides owing to the restrictions of Kasha's rule. Herein, we reported a novel 2D lead-free halide of (AMP) 2 Cu 2 Br 4 (AMP = N-aminomorpholine) through structural engineering, in which the [Cu 2 Br 4 ] 2− layer is composed of corner- and edge-shared [CuBr 4 ] tetrahedron. The non-centrosymmetric structure enables (AMP) 2 Cu 2 Br 4 to exhibit an impressive second-harmonic generation signal of ≈0.8 times that of KH 2 PO 4 (KDP). Remarkably, (AMP) 2 Cu 2 Br 4 possesses two independent self-trapped exciton-emitting states under different excitation energies, which display multicolor luminescence outputs from blue, white, to orange with near-unity photoluminescence quantum yields (PLQYs). Additionally, the luminescence can be regulated in a wide temperature range of 300–400 K due to reversible energy transfer between two emitting bands, acting as a luminescence ratio thermometer with a ultrahigh relative thermal sensitivity of 56.755% K −1 . High PLQY and large Stokes shift further endow (AMP) 2 Cu 2 Br 4 strong radioluminescence with an ultrahigh light yield of 92,400 photons·MeV −1 , low detection limit of 121 n Gy air ·s −1 and a short afterglow of 0.41 m s. The abundant photophysical properties highlight the multiple optoelectronic applications of 2D cuprous halide in white light-emitting, laser technology, flexible temperature sensors, and X-ray imaging.
研究领域:
材料科学
·
光电子学
·
凝聚态物理
·
无机化学
·
功能材料
·
辐射探测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Jinke Bai,Tianyi Hou,Meilun Zhang,Peilin Ou,Xiao Jin,Qinghua Li,Zisheng Su,Zeqiang Chen,Yuxiao Wang,Xueru Zhang,Yinglin Song
Environmentally friendly zinc selenide (ZnSe) based core/shell quantum dots (QDs) are promising emitting materials for special light sources and displays. However, ZnSe-based core/shell QDs with violet-blue emission that simultaneously possess thick shells and narrow emission linewidths are still challenging thus far. We herein use a gradient ZnSe x S 1-x /ZnS shell strategy to target this goal. The ZnSe x S 1-x mid shell helps the lattice strain relaxation during the growth, whereas the wide bandgap ZnS outer shell benefits the optical properties by passivating the emitting cores and improving the quantum confinement effect. These ZnSe core QDs show a unity zinc blende structure and high crystallinity . The optimized ZnSe/ZnSe x S 1-x /ZnS QDs exhibit tunable emission wavelengths (415–445 nm), narrow photoluminescence linewidths (10.2–14.2 nm), thick shells (>3.9 nm), and high photoluminescence quantum yields (>50%). We postulate that these excellent features are due to the use of alloyed ZnSe x S 1-x layer at the core/shell interfaces. This study provides a feasible idea for the development of blue ZnSe-based QDs with perfect emitting properties.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Zhili Xu,Shuanglai Liu,Wenwu You,Mingxing Li,Jiacai Li,Pingping Fan,Xu Zhao,Gencai Pan,Huiping Gao,Yanli Mao
Organic–inorganic hybrid metal halides have attracted considerable attention due to their facile synthesis, low cost, and high thermal and chemical stability. However, developing environmentally benign, readily synthesized, high-performance, and spectrally tunable broadband-emitting materials remains challenging. Herein, this study reports a zero-dimensional perovskite material, TEA2HfCl6:Sb3+, using a room-temperature coprecipitation method. This material exhibits low toxicity and excitation-wavelength-dependent modulation of singlet and triplet emission ratios, enabling broadband emission ranging from warm white to deep red. Notably, TEA2HfCl6:11%Sb3+ achieves a high photoluminescence quantum yield of up to 93.1%. Steady-state and time-resolved spectroscopic analyses reveal that these emissions arise from Sb3+-induced radiative transitions of singlet and triplet self-trapped excitons. Furthermore, leveraging its scalable synthesis process and favorable emission characteristics, the material shows potential for applications in large-area optical anticounterfeiting paper and full-spectrum, eye-friendly white-light-emitting diode (WLED). These findings highlight the dual functionality of TEA2HfCl6:Sb3+ in secure optical encryption and solid-state lighting, providing a promising platform for the development of multifunctional luminescent materials.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态照明
·
安全与加密
·
无机化学
·
纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 21
·8356-8363
·
IF 8.067
Ye Li,Miaoling Cai,Mengling Shen,Yuting Cai,Rong-Jun Xie
The stability of perovskite nanocrystals (NCs) is greatly limited due to highly dynamic binding of ligands, which hinders their applications in optoelectronic devices. In this paper, a new ligand strategy was employed to prepare CsPbBr3 NCs via a facile room temperature (RT) ligand-assisted reprecipitation (LARP) method, where N1.N2-didodecyl-N1.N1.N2.N2-tetramethylethane-1.2-diaminium bromide (DTDB) as the sole capping ligand and an additional Br resource was used. Compared to other ligands with one coordinating group, this class of bidentate ligand can be tightly anchored to the surface of NCs with double N+ sites. The as-synthesized DTDB-CsPbBr3 NCs exhibited a high photoluminescence quantum yield (PLQY) of 92.3% and also showed a superior colloidal stability even under intense purification for up to ten cycles. Compared to the dodecyltrimethyl ammonium bromide (DTAB) ligand capped-CsPbBr3 NCs, the DTDB-CsPbBr3 NCs display obviously enhanced stability to light, heat and water. X-ray photoelectron spectroscopy (XPS) results revealed that the DTDB-CsPbBr3 NCs have a Br− rich surface, which accounts for the high stability and PLQY. Hence, DTDB is a promising ligand to prepare perovskite NCs with higher optical performance.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302434
·
IF 9
Zhi-Zhong Zhang,Zi-Lin He,Jian-Bin Luo,Jun-Hua Wei,Xiu-Xian Guo,Jing-Hua Chen,Dai-Bin Kuang
The current mainstream planar X-ray imaging techniques face significant challenges for accurately capturing the internal structure of curved objects, since the variable distances between the curved objects and the flat-panel scintillation screen cannot eliminate the distortion in X-ray imaging. Though large-area and transparent curved scintillation screens are much more desirable. Here, organic–inorganic hybrid Mn-based single crystals ([CH 3 Ph 3 P] 2 MnX 4 , X = Cl, Br, I) exhibiting high photoluminescence quantum yield (PLQY) and low melting temperature have been employed to prepare transparent glass for X-ray scintillation imaging application through a low-temperature melting strategy. The [CH 3 Ph 3 P] 2 MnBr 4 -glass shows high PLQY (47.8%), high-resolution X-ray imaging performance (12.3 lp mm −1 ), low limit of detection (25.33 nGy s −1 ), and impressive X-ray irradiation stability (102 Gy). Furthermore, high-contrast X-ray imaging at a low dose (6.865 µGy per exposure, 14.5 times lower than the chest radiograph) is achieved. Based on the low glass transition temperature ( T g = 53.6 °C) and easy-shapeable properties of [CH 3 Ph 3 P] 2 MnBr 4 -glass scintillator, the large-area curved scintillation screen with a series of sizes of Φ 2×4 – Φ 8×4 cm 2 can be easily fabricated and show high X-ray imaging quality. These findings provide a paradigm for future research in shapeable X-ray scintillators, unlocking new possibilities for curved and 3D X-ray imaging.
研究领域:
材料科学
·
光学
·
放射学
·
成像技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）