Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xuyong Tao,Boyan Liu,Guoqing Tong,Hanwen Zhu,Junchun Li,Yuanyuan Sheng,Chengyun Wu,Yajing Chang,Yangqing Wu,Yang Jiang
Ligand exchange has been demonstrated as an efficient strategy to improve the photoluminescence quantum yield (PLQY) and stability of quantum dots (QDs). Long-term illumination can considerably accelerate the ligand desorption after ligand exchange because of the weak bonding between the ligand and QDs. Here, a novel light-driven luminescence evolution strategy in combination with ligand exchange is devised by using N-acetyl-l-cysteine (NAC) as a ligand. NAC is expected to coordinate with the uncoordinated Pb2+ to improve the bonding between NAC and QDs. Light illumination is employed to accelerate the digestive ripening process and realize the uniform distribution of QDs. On the basis of the synergistic effect of NAC ligand exchange and light illumination, the CsPbBr3 QDs show reduced surface defects with nearly 100% PLQY and remarkable stability in polar solvents. Furthermore, a white light-emitting diode is demonstrated with a high rendering index of 80.7 and color temperature of 5595 K.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17281-17289
·
IF 4.39
Dayu Huang,Yue Liu,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The stability of perovskite quantum dots (PQDs) plays a vital role in practical devices. Besides silica coating, embedding PQDs in zeolites is another strategy to improve their stability significantly. Although the zeolite rigid framework has been reported to protect PQDs, there are few reports on the in situ synthesis of PQDs in zeolites. In this work, cubic phase CsPbX3 (X = Br, I) nanocrystals were successfully prepared by the ion exchange method combined with a non-polar organic trigger. Dropping a certain amount of ZnM2 (M = Br, I) solution into the intermediate product Cs4PbCl6 nanocrystals resulted in the formation of the final CsPbX3 nanocrystals. The ZnM2 solutions were prepared in non-polar solvents (hexane, octane, or chloroform). The highest photoluminescence quantum yield (PLQY) of the synthesized CsPbX3@zeolite composites can reach 83%, with a lifetime of 1.37 μs. The stability of the CsPbX3@zeolite composites thin film against damage from air and light is significantly improved. We fabricated white light-emitting diodes (WLEDs) using CsPbBr3@zeolite as the green light source and CsPbI3@zeolite as the red light source to further emphasize the practical application effect of the CsPbX3@zeolite composites. This work not only provides a new method for the synthesis of CsPbX3 nanocrystals but also involves the in situ synthesis of high stability CsPbX3@zeolite composites within the zeolite.
研究领域:
材料科学
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光电技术
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纳米技术
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光伏技术
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Wei Liu,Huidong Xie,Xiaoling Guo,Kangkang Wang,Chang Yang,Na Wang,Chengmin Ge
CsPbBr 3 perovskite quantum dots/polymethyl methacrylate composites were prepared by a ball milling method, using PMMA as polymer matrix and cesium stearate, lead stearate, and KBr as perovskite sources. We investigated the stability of the composites against UV light , heat, ethanol, and water vapor and evaluated the luminescence performance of the products. The results show that the 1.5% CsPbBr 3 PQDs/PMMA composite prepared by the present method exhibited excellent performance, with a PLQY up to ∼78% and a high stability. The luminous intensity remained at 80%, 87%, 53%, 59%, and 64% of its initial value under ultraviolet light irradiation for 12 days, 467.5 nm LED irradiation for 10 days, heating at 60 °C for 10 days, erosion in water vapor at 95% relative humidity and 25 °C for 90 h, and soaking in ethanol for 3 h, respectively. The luminous efficiency of a white light-emitting diode fabricated with the CsPbBr 3 PQDs/PMMA composite was 76.73 lm·W −1 , and the RhB degradation percentage under visible light reached 92.2% within 60 min. The preparation method has the advantages of simple processing, solvent- and ligand-free nature, low synthesis temperature, and easy scalability; the as-prepared PQDs composites have high quantum yields and good environmental stability, which highlights the great application prospects of the present method.
研究领域:
材料科学
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光电技术
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纳米技术
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产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200793
·
IF 9.14
Yanmei Guo,Jinxi Chen,Yixin Zhao,Yongbing Lou
Graphical Greener approach to toluene oxidation : Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite quantum dots (QDs) are anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing surface passivation and suppressing optical decay. Additionally, the novel composites as photocatalysts are used to drive the oxidation of toluene and demonstrate astonishing conversion rates with high selectivity. All-inorganic metal halide perovskite quantum dots (QDs) have attracted attention from researchers with their fascinating optoelectronic properties. However, blue-emitting perovskite QDs typically have low photoluminescence quantum yield (PLQY). For potential commercial applications, it is preferable to replace Pb with an element having low toxicity. Here, Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite QDs were anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing efficient surface passivation and suppressing optical decay. Compared to unanchored QDs, Cs 3 Bi 2 Br 9 @BiOBr QDs/A−SiO 2 composites exhibited significantly enhanced blue emission performance, the PLQY of which increased from 16.62 % to 77.26 %, in addition to good water and environmental stability. Finally, the novel composites as photocatalysts were used to drive the oxidation of toluene, a template reaction of C(sp 3 )−H bond activation and demonstrated astonishing conversion rates (4317 μmol g −1 h −1 ) with high selectivity (around 87 %).
研究领域:
材料科学
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化学
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环境科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yuanjie Wang,Tengfei Cao,Zhihuang Xu,Liwang Ye,yingui Gao,Xinxin Zhuang
Mn 2+ -based halides show great promise for solid-state lighting and display applications owing to their structural flexibility and excellent luminescence properties. Herein, three hybrid manganese halides (N-AEP)[MnBr 3 (H 2 O) 3 ] 2 ·Br ( 1 ), [(N-AEP) 2 MnBr 6 ]·2Br ( 2 ) and [(N-AEP) 2 MnBr 4 ]·3Br(H 2 O) ( 3 ) with the same organic ligand have been successfully synthesized by adjusting various HBr level or temperature of growth solutions. Systematic characterizations of halides including crystal structure, thermal and photophysical properties were carried out. Their distinct inorganic groups lead to the various luminescence colors: purple-red light in 1 , orange-red light in 2 and green light in 3 . Some interesting physicochemical features, for 1 the temperature-dependent emission properties, 2 the satisfactory thermostability with higher PLQY (13.36%), and 3 the weak ferromagnetic coupling effect, broaden their application prospects. This paper offers sufficient synthetic experiences for Mn 2+ -based halides with different inorganic groups in detail, and provides a reasonable research scheme for their optical properties .
研究领域:
材料科学
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化学
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光电
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固态照明
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Zhiwei Yao,Chenghao Bi,Jianjun Tian
Quantum dot light-emitting diodes (QLEDs) show great potential in high-definition displays due to their narrow emission and high color purity. However, the imperfect quantum dots (QDs) with high trap density are difficult to be removed from QD solution, which could cause serious nonradiative recombination, thereby suppressing the improvement of QLEDs. Here, we devise a novel chemical filtering strategy with a bidentate coordination to remove the imperfect QDs. The bidentate ligand of ethanolamine (EA) with an amidogen and a carboxyl was directly added into the CdSe/CdS/ZnS core/shell/shell QD solution. Then, uncoordinated sites such as S2– and Zn2+ on the surface of QDs were bonded with the amidogen and carboxyl of EA, respectively, resulting in aggregations of the imperfect QDs with high defect density, which were precipitated from the solution. As a result, the photoluminescence quantum yield (PLQY) of the filtered QD solution increased to 93% because of the decrease in trap density. The size distribution of QDs was also improved after filtration. QLEDs fabricated with filtered QDs show a high external quantum efficiency (EQE) of 15.76% and luminance of 19,640 cd/m2, greater than those of the control devices. This strategy shows a great potential to be used in the large-scale treatment and production of QDs and QLEDs.
研究领域:
材料科学
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纳米技术
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光电子学
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显示技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yu Zhang,Guangning Hou,Yong Wu,Maosheng Chen,Yannan Dai,Shaohua Liu,Qingbiao Zhao,Hechun Lin,Junfeng Fang,Chengbin Jing,Junhao Chu
Oleylamine/oleic acid (OAm/OA) as the commonly used ligand is indispensable in the synthesis of perovskite nanocrystals (PNCs). Unfortunately, poor colloidal stability and unsatisfactory photoluminescence quantum yield (PLQY) are observed, resulting from a highly dynamic binding nature between ligands. Herein, we adopt a facile hybrid ligand (DDAB/ZnBr2) passivation strategy to reconstruct the surface chemistry of CsPbBr3 NCs. The hybrid ligand can detach the native surface ligand, in which the acid–base reactions between ligands are suppressed effectively. Also, they can substitute the loose capping ligand, anchor to the surface firmly, and supply sufficient halogens to passivate the surface trap, realizing an exceptional PLQY of 95% and an enhanced tolerance toward ambient storage, UV irradiation, anti-solvents, and thermal treatment. Besides, the as-fabricated white light-emitting diode (WLED) utilizing the PNCs as the green-emitting phosphor has a luminous efficiency around 73 lm/W; the color gamut covers 125% of the NTSC standard.
研究领域:
材料科学
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纳米技术
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 11
·4263-4270
·
IF 8.307
Kunlun Liu,Jun Zhao,Gencai Pan,Yaxian Zhu,Wenwu You,Huafang Zhang,Huiping Gao,Yanli Mao
Lead halide perovskite quantum dots (PQDs) are extremely unstable when exposed to oxygen, water and heat, especially red CsPbBrxI3−x (x = 0, 0.5, 1.2) PQDs. This seriously hinders their practical application. Here, red CsPbBrxI3−x (x = 0, 0.5, 1.2) PQDs have been successfully encapsulated in porous CaF2:Ce,Tb hierarchical nanospheres (HNSs), which not only greatly improved the stability of PQDs, benefitting from the protection of the CaF2 shell, but also maintained the high photoluminescence quantum yield (PLQY) of PQDs, benefitting from the sensitization of Tb3+ ions. More importantly, porous CaF2:Ce,Tb nanoarchitectures can prevent aggregation quenching and anion exchange of PQDs. Therefore, the CaF2:Ce,Tb&CsPbBrxI3−x (x = 0, 0.5, 1.2) composite powder can have high PLQY comparable to that of the PQD powder. In view of this, CaF2:Ce,Tb&CsPbBr1.2I1.8 composite based red light-emitting diodes (LEDs) are prepared, and they are very suitable as a supplementary light source for plant lighting. Furthermore, white LEDs are also prepared by coating the CaF2:Ce,Tb&CsPbBr3 and CaF2:Ce,Tb&CsPbBr1.2I1.8 composite on a 450 nm chip. The optimum luminous efficiency is 61.2 lm W−1, and the color rendering index is 91, which are comparable to the current highest values. This shows that the composite composed of PQDs has great potential in LED lighting.
研究领域:
材料科学
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纳米技术
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光电技术
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yongrun Dong,Wen Li,Tao Huang,Shuaigang Ge,Linghang Kong,Chuang Ning,Zequan Li,Wei Gao,Bingsuo Zou
Recently, lead-free double perovskites have been regarded as a promising alternative to lead halide perovskites due to their wide emission band, and environmental protection and stability properties, and are expected to become a series of rising star materials in the lighting field. However, currently, the growth of most lead-free double perovskites occurs in the strong acid environment, which not only brings high cost and environment risk, but also makes it hard to realize large-scale applications with powder products. Herein, we apply a strategy of in situ synthesis of lead-free double perovskites in a polymer matrix by using a small amount of precursors and relatively friendly DMSO solvent to obtain efficiently luminescent Sb3+/Mn2+ co-doped Cs2KInCl6/PVDF composite films in a large-area. The co-doping of Mn2+/Sb3+ into this inorganic double perovskite matrix makes microcrystals with good crystallinity and size distribution in this polymer. The as prepared co-doping composite film with Mn/Sb feeding ratio 16 : 1 shows the brightest white light emission under 320 nm excitation, with a photoluminescence quantum yield (PLQY) as high as 86.98%. The energy transfer (E-T) from the charge-transfer band to the triplet self-trapped exciton (STE) around Sb3+ and then to the ferromagnetic (FM) coupled Mn2+ pair 3d state was confirmed by the temperature-dependent PL spectra and density functional theory calculations. Finally, a single-compound white light emitting diode with chromatic coordinates of (0.31, 0.33) and fluorescent anti-counterfeiting labels could be fabricated based on this composite film with the best white emission. This work provides a new strategy for the application of lead-free double perovskites in the fields of lighting and anti-counterfeiting.
研究领域:
材料科学
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光电技术
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光子学
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纳米技术
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照明技术
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防伪技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Cheng Li,Hui Li,Zishao Wang,Tianxin Bai,Xiaochen Wang,Méline Aurore Mathilde Parent,Yang Yu,Junsheng Chen,Ruifeng Lu
Tunable broad-spectrum luminescent materials covering the ultraviolet (UV), visible, and near infrared (NIR) regions are essential for next-generation optoelectronic technologies. However, conventional systems are often limited by inefficient UV emission and the inability to integrate multiple spectral components within a single material. Here, a design strategy that combines ns 2 -ion with controlled lattice distortion is introduced to overcome these challenges. Using 4,4-difluoropiperidine (DFPD) as the organic cation, a family of hybrid metal halide phosphors, [(DFPD) 2 MCl 4 ·H 2 O, M = Cd/Zn] doped with different ns 2 ion (Sn 2+ , Pb 2+ , Sb 3+ , Bi 3+ , and Te 4+ ) is synthesized. It is revealed that reduced lattice distortion correlates with enhanced photoluminescence quantum yield (PLQY), enabling broadband self-trapped exciton emission spanning the UV–vis–NIR range within a single host matrix. Leveraging the highly efficient UV emission of 2% Pb-doped (DFPD) 2 CdCl 4 ·H 2 O (PLQY: 93%), a high-performance white light emitter with a color rendering index of 92.9 and a correlated color temperature of 6087 K is demonstrated. The materials further exhibit promising functionality in NIR imaging and multi-level anti-counterfeiting. This work elucidates the interplay between lattice distortion and exciton dynamics in Cd/Zn-based hybrid metal halides, providing fundamental insights into their photophysics and establishing a versatile strategy for designing next-generation broadband multifunctional optoelectronic materials.
研究领域:
光电材料
·
发光材料
·
固态化学
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材料科学
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Ruifeng Liu,Yunluo Wang,Haoming Qin,Xuchang He,Shihao Ge,Jianghua Wu,Tianrui Zhou,Tingting Ye,Zesen Gao,Futing Sun,Jingshan Hou,Yihui He,Lianjun Wang,Haijie Chen,Wan Jiang
Lead-free halides, with the advantages of non-toxicity and high stability, have broad application prospects. Here, we studied the synthesis and luminescent properties of the Sb-doped Rb 2 ZnCl 4 and explored their utilizations for white light-emitting diode (WLED) and X-ray detection. The as-synthesized Rb 2- x Zn 1- x Sb x Cl 4 single crystals exhibit bright red emission centered at 740 nm with a large full width at half maximum (FWHM) of 220 nm, and the maximum photoluminescence quantum yield (PLQY) is determined to be 59.7 % for the sample with x = 0.01. The assembled WLED achieves a high color rendering index (CRI) of 93.6 and a low correlated color temperature (CCT) of 3755 K. Under continuous X-ray irradiation for 600 s at a dose rate of 26.5 Gy min −1 , the irradiation luminescence intensity of Rb 1.99 Zn 0.99 Sb 0.01 Cl 4 did not decrease, indicating that the single crystal has a high tolerance to X-ray irradiation. Our work demonstrates that Zn halides are also a promising lead-free family for multiple optoelectronic applications.
研究领域:
材料科学
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光电子学
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光子学
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辐射检测
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产品关联
DOI
高影响因子
Chemical Science
·
2024
·Vol. 15
·期 8
·2954-2962
·
IF 7.6
Chuying Wang,Wen Meng,Guigen Luo,Guangyong Xu,Min Peng,Bin Xu,Shuming Nie,Zhengtao Deng
Materials with two or more fluorescence features under different excitation sources have great potential in optical applications, but luminous materials with three emission characteristics have been largely undeveloped. Here, we report a novel zero-dimensional (0D) organic–inorganic hybrid ((C2H5)4N)2ZrCl6 perovskite with multiple emissions. The zirconium-based perovskite exhibits a red emission around 620 nm, a green emission at 527 nm, and a blue emission around 500 nm. The red and green emissions come from self-trapped excitons (STEs) and the d–d transitions of Zr(IV), respectively, which are caused by distortion of the [ZrCl6]2− octahedra. The blue emission is caused by thermally activated delayed fluorescence (TADF), which is similar to that of Cs2ZrCl6. The absolute photoluminescence quantum yield (PLQY) of the red and blue double emission is up to 83% and the PLQY of the green emission is 27%. With different combinations of ((C2H5)4N)2ZrCl6 samples, we achieve a variety of applications, including a two-color luminescent anti-counterfeiting device, a white light-emitting diode (WLED) with a color rendering index (CRI) of 95 and information encryption with different excitations. We also synthesize other hybrid zirconium perovskites with tri-luminescence through a similar method. Our work provides a potential set of excitation-dependent luminescent materials and is expected to expand the basic research and practical applications of multi-luminescence materials.
研究领域:
材料科学
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光学
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）