Inorganic Chemistry Frontiers
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2024
·Vol. 11
·期 20
·7098-7109
·
IF 6.1
Fengmei Zhu,Yuan Gao,Jianbei Qiu
Presently, there is a need to expand the near-infrared (NIR) emission range, especially in the bio-transparent window, to improve the internal quantum efficiency and external quantum efficiency, and to minimize the shortcomings of luminescence properties. In this work, an ultra-broadband NIR emission Cr3+-doped Cs2NaLuCl6 all-inorganic metal halide perovskite phosphor was synthesized by a grinding–sintering method. Under 300 nm excitation, Cs2NaLuCl6:Cr3+ phosphors exhibited ultra-broadband NIR emission of 800–1400 nm, which covers nearly the entire NIR-I (700–1000 nm) and NIR-II (1000–1400 nm) regions; the emission peaked at around 960 nm, with a full width at half maximum of ∼182 nm. Noticeably, the internal- and external-quantum efficiencies of the optimized Cs2NaLuCl6:Cr3+ phosphor were as high as ∼92.9% and ∼60.75%, respectively. We showed through analysis and simulation that the weak crystal field strength is conducive to increasing the odd term of the crystal field, and therefore it partially released the restriction imposed by the parity prohibition law and improved the energy absorption efficiency of Cr3+. As the size of the phosphor approaches the wavelength of NIR luminescence, the apparent Mie scattering effect starts to take effect, which enhances the light extraction of NIR luminescence in the radial direction.
研究领域:
材料科学
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光学
·
生物医学工程
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2019
·
IF 7.723
Yi Li,Shan Yu,Dmitry E. Doronkin,Shiqian Wei,Meng Dan,Fan Wu,Liqun Ye,Jan-Dierk Grunwaldt,Ying Zhou
As an important byproduct during natural gas exploitation, green utilization of hydrogen sulfide (H 2 S) by photocatalysis has offered us the possibility for production of clean hydrogen (H 2 ) from H 2 S with low energy consumption. In this work, we have successfully introduced well-dispersed palladium sulfide (PdS) which is preferably loaded on In 2 S 3 of MnS/In 2 S 3 composite for improved photocatalytic hydrogen evolution from H 2 S aqueous solution. In contrast to binary MnS/In 2 S 3 , ternary MnS/In 2 S 3 /PdS has exhibited a remarkable and stable hydrogen production rate of 22.7 mmol g −1 h −1 with an apparent quantum yield of 34% at around 395 nm. A comprehensive structure characterization of the ternary composite including scanning transmission electron microscopy (STEM) and X-ray absorption spectroscopy (XAS) in combination with theoretical calculations confirm the good dispersion of PdS in the composite. Moreover, we discovered that PdS preferably interact with In 2 S 3 rather than MnS in the composite through Pd-S-In bond on the interface of the two. Photoluminescence (PL) spectra, surface photovoltage (SPV) spectra together with transient photocurrent and electrochemical impedance spectra (EIS) demonstrate the advantage of PdS for promoting the charge separation. This work sheds light on the positive effect on the enhanced activity of the corresponding system resulting from the preferable anchoring of highly dispersed PdS on In 2 S 3 in the composite by chemical Pd-S-In bond. Not only the high dispersion but also the preferable anchoring of the co-catalyst in the composite could hence inspire people for more rational designs of ternary composite in future.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-17
·
IF 2.4
Gan Wei,Guo Yan,Zhu Dan,Ling Min,Jiang Can,Zhang Shengfu
With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO 2 /Ti 3 C 2 T x (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti 3 C 2 T x . The prepared R/A-TiO 2 /Ti 3 C 2 T x -0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO 2 and Ti 3 C 2 T x interfaces improved the photo-quantum efficiency of R/A-TiO 2 /Ti 3 C 2 T x , and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO 2 /Ti 3 C 2 T x -0.2 was 77.82% in 2 h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h + , ·OH, and·O 2 − . This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO 2 -based photocatalysts. Graphical R/A-TiO 2 /Ti 3 C 2 T x photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 13
·4496-4504
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IF 7.393
Qinghong Zheng,Huixin Li,Yiling Zheng,Yinan Li,Xi Liu,Shuangxi Nie,Xinhua Ouyang,Lihui Chen,Yonghao Ni
A cellulose-based flexible organic light-emitting diode (OLED) with enhanced stability and light extraction efficiency was prepared by using a PEDOT:PSS PH1000 transparent conductive electrode coated on regenerated cellulose film (RCF). The PH1000/RCF transparent conductive electrode exhibits extra-high bending stability as compared to the traditional ITO/RCF electrode, which can be attributed to the highly flexible nature of PH1000 and the strong interaction between PH1000 and cellulose. Finite-difference-time-domain simulations show that, due to the smaller refractive index mismatch between PH1000 and RCF, a small proportion of photons are confined in the optical waveguide. The external quantum efficiency of the PH1000/RCF OLED (3.65%) is enhanced by nearly 36.2%, as compared to the ITO/RCF OLED device (2.68%). The ITO-free cellulose-based flexible OLED with enhanced stability and external quantum efficiency would be attractive in a wide range of applications, such as flexible displays, wearable devices and so on.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 15
·13005-13010
·
IF 2.324
Cao Renping,Cheng Xinyu,Zhang Fangteng,Su Lei,Chen Ting,Ao Hui,Yu Xiaoguang,Ruan Wen
A series of MgTiO 3 :Mn 4+ , MgTiO 3 :Mn 4+ , Ge 4+ , and MgTiO 3 :Mn 4+ , B 3+ phosphors are prepared by the high temperature solid-state reaction method in air. X-ray powder diffraction (XRD) patterns confirm that there is only pure phase in all samples. The samples are composed of microparticles with irregular shapes. Their excitation spectra monitored at 658 nm may be observed in the range of 200–600 nm and their emission spectra with excitation at 330 nm cover the region from 600 to 800 nm due to the 2 E → 4 A 2 transition of Mn 4+ ion. The chromaticity coordinate is (0.7233, 0.2767). The optimal Mn 4+ content is ~ 0.3% in MgTiO 3 :Mn 4+ phosphor. The luminescence intensity and quantum efficiency of MgTiO 3 :Mn 4+ phosphor may be obviously improved by adding Ge 4+ ion and H 3 BO 3 . The experimental results are helpful for the luminescence property improvement of other Mn 4+ doped materials.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Xin Zhang,Haohuan Yuan,Jiao Bao,Wenting Xiao,Guannan He
ZnCdS, a metal chalcogenide solid solution, has attracted significant attention. However, two primary challenges hinder its widespread application in photocatalytic hydrogen evolution : the rapid recombination rate of photogenerated carriers and susceptibility to photo-oxidation in the aqueous environments. In this article, a facile hydrothermal route was employed for the first time to uniformly assemble SnS 2 nanoparticles onto the surface of Zn 0.2 Cd 0.8 S (ZCS) nanopolyhedra. The intimate contact of two materials resulted in the formation of heterojunctions . By adjusting the content of SnS 2 , the hydrogen evolution reaction (HER) performance was optimized to reach up to 12170 μmol/gh, which is 1.9 times of the pristine ZCS. Notably, the photocatalyst demonstrated remarkable stability with an apparent quantum yield (AQY) of 15.5% at 420 nm. The enhanced photocatalytic performance can be attributed to the following factors: (i) The heterojunction composite, with larger surface area and more micropores, provides additional active sites and exhibits high photocatalytic activity ; (ii) The internal electric field accelerates the separation of photogenerated carriers and reduces the recombination rate of electron-hole pairs; (iii) The photogenerated holes can be quickly transferred to the valence band of SnS 2 and react with triethanolamine , thereby significantly reducing the photo-oxidation of ZCS. This work not only proposed a feasible route to improve the photocatalytic activity of ZCS, but also provided insights into the role of heterojunctions and the reaction mechanism.
研究领域:
材料科学
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光催化
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能源化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Yanshan Wan,Jibiao Li,Jiupai Ni,Chong Wang,Chengsheng Ni,Hong Chen
Photocatalysis is believed to be an important way of reducing NO pollutant in air and the facet engineering of semiconducting oxides could enhance the efficiency of the photocatalysis. ZnO nanoparticles with different exposed crystalline facets were successfully synthesized using a hydrothermal method and their photocatalytic degradation towards NO was investigated. The crystals from ZnCl 2 precursor were hexagonal mesoporous ones with exposed (0002) facet, while those from zinc acetate were in the form of flakes or wheat ears with enhanced exposure of (10 1 ( − ) 1) facet. Calcination in air imparted an enhanced the textural coefficient of the orientated facets as well as the oxygen defects. The nanocrystals with enhanced (0002) facet and lower flat-band energy did better in photoelectrochemical water-oxidation than those with exposed (10 1 ( − ) 1) facet that showed superior photocatalytic activity (approaching 76.7 ± 0.6% under 365 nm photons) for NO oxidation. According to theoretical calculations, (10 1 ( − ) 1) facet with O termination showed much higher affinity to NO molecules than other configurations, and the oxygen vacancy in ZnO played an minor role in the photocatalytic oxidation of NO. A high quantum efficiency approaching 97.5 ± 1.4% under 275 nm photons was obtained for the ZnO crystals from zinc acetate with mixed (0002) and (10 1 ( − ) 1) facets. This research explores the special characteristics of ZnO with different exposed facets and is important for the future design of highly efficient photocatalyst for hazardous material removal.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 24
·6584-6595
·
IF 7.779
Quwei Ni,Jiansheng Huo,Jiachun Liu,Haojun Yan,Qijian Zhu,Jieying Li,Chenggang Long,Qianming Wang
The exploitation of functional phosphors possessing a variety of advantages, including narrow-band emission, fast response to near-ultraviolet (n-UV)/blue light excitation, high quantum efficiency, and low thermal quenching, is essentially important for the wide-color-gamut display backlights. It is the first example to introduce Ce3+–Tb3+ pairs into the Ca3Lu2Si6O18 (CLSO) host for identifying a novel green-emitting material with all the mentioned properties. The efficient Ce3+ → Tb3+ energy transfer process was monitored in the CLSO host via dipole-quadruple interactions between Ce3+ and Tb3+ ions, leading to a wide excitation band in the n-UV region and bright green light with a main sharp emission band at 543 nm. Moreover, the composition-optimized sample has been found to achieve extremely high internal quantum efficiency (close to unity) and excellent thermal stability (lost only 13.2% of the initial emission intensity at 150 °C), which are more favorable than those shown by a vast majority of green-emitting phosphors reported recently. The prototype pc-WLED fabricated using the as-prepared sample as the green component exhibited a high luminous efficiency (LE) of 31.48 lm W−1 and a wide color gamut of 91.2% (area ratio) National Television Standards Committee (NTSC) 1953 standard. These attractive properties verified that the proof of concept concerning the designed sample will be a promising candidate to substitute the current green color phosphors for wide-color-gamut display backlights.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 17
·期 8
·2200940
·
IF 11
Yiyang Liu,Rong Zhang,Kaiyi Yan,Jian-Feng Sun
The mineral structure-inspired discovery of red phosphors has become a research hotspot that can help compensate for the missing red components in cold white light-emitting diodes (WLEDs). Herein, first the feldspar-type structure is utilized to develop narrowband red-emitting CaAl 2 Si 2 O 8 :Mn 4+ /Mn 4+ , Mg 2+ phosphors. Rietveld refinement results confirm the Mn 4+ occupation of the distorted [Ca1O 6 ] octahedron, resulting in a strong nephelauxetic effect, and thus exhibits bright red luminescence with a narrow full width at half maximum (43 nm). Compared with CaAl 2 Si 2 O 8 :Mn 4+ , the fluorescence intensity of CaAl 2 Si 2 O 8 :Mn 4+ , Mg 2+ is further enhanced by up to 210% owing to the decreasing nonradiative decay rate from 2 E g excited state, which weakens the concentration quenching effect resulting from energy migration along the adjacently aggregated Mn 4+ . CaAl 2 Si 2 O 8 :Mn 4+ , Mg 2+ shows preferable thermal stability with an ultrahigh quantum efficiency (90.3%), surpassing other current Mn 4+ -doped oxide phosphors and UCr 4 C 4 -type nitride phosphors. A fabricated prototype WLED obtains ideal warm white light with a low correlated color temperature (3081 K) and a wide color gamut covering 112% of the National Television System Committee standard. Guided by natural mineral-type structural prototypes, this study demonstrates the possibility of designing a uniquely distorted local structure to achieve a superior luminescence performance of Mn 4+ for warm WLEDs.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Taifang Zhang,Dan Zhang,Zeyu Gao,Baoqi Ai,Valery F. Gremenok,Peng Wang,Chonggeng Ma
The advancement in the development of high-efficiency cyan-green emitting phosphors is pivotal for achieving high-color-quality full-visible-spectrum white light-emitting diodes (WLEDs). In this study, a series of novel cyan-green emitting BaLu 2 Al 3 ScGe 1- y Si y O 12 : x Ce 3+ (BLASGe 1- y Si y O: x Ce 3+ ) phosphors were successfully synthesized. X-ray diffraction analysis confirmed that all samples possess a typical garnet crystal structure, belonging to the Ia 3 ̅ d space group. The emission spectra of these BLASGe 1- y Si y O: x Ce 3+ phosphors effectively bridge the “cyan gap” within the 480–520 nm cyan-green emission region. Under 438 nm blue light excitation, the prepared BLASGO: Ce 3+ phosphor exhibits broad-band cyan-green emission with an emission peak at 504 nm and a full width at half maximum (FWHM) of 103 nm, thereby significantly enhancing cyan emission while preserving green emission. More importantly, by substituting Ge 4+ ions with smaller Si 4+ ions, the internal quantum efficiency (IQE) and thermal stability of the phosphor are markedly improved due to the highly symmetrical rigid structure. The optimized BLASSO: Ce 3+ phosphor demonstrates superior cyan-green emission performance with a high internal quantum efficiency of 93.28 % (an enhancement of 31.23 %) and thermal stability increased to 69.62 %. Based on the developed BLASSO: Ce 3+ cyan-green phosphor, a high-performance full-visible-spectrum WLED device was successfully fabricated, featuring a high color rendering index (CRI or R a , R a = 93.4) and a low correlated color temperature (CCT = 2814 K).
研究领域:
材料科学
·
光电子学
·
固态照明
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荧光粉化学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 7
·6594-6602
·
IF 9.5
Chen Yifu,Zhang Lin,Peng Xinxin,Qin Weiran,Li Shiqing,Wang Yingwei,Chen Zhihui,Xiao Si,Yang Bin,Liu Biao,Yang Junliang,Huang Han,Lin Yun,He Jun,Ding Liming,Yuan Yongbo
Although numerous metal halide perovskite materials have been investigated in the field of optoelectronic, the development of perovskite heterojunctions with exotic structures is still rare. Herein, we report the epitaxial growth of quasi-two-dimensional (Q-2D) perovskites on methylammonium lead iodide (MAPbI 3 ) single crystals to form perovskite heterojunctions with interfacial bonding. The MAPbI 3 adjacent to epitaxial Q-2D perovskite shows blue shifted photoluminescence with shortened lifetime, which becomes significant with the reduced layer number of the Q-2D perovskites. Our findings suggest the presence of an interfacial strain gradient leading to enhanced photocarrier separation. Accordingly, compared to the MAPbI 3 single crystal detector, the BA 2 MAPb 2 I 7 /MAPbI 3 (BA: n-butylamine) heterojunction-based photodetector demonstrates a bandpass detecting property and exhibits 5 times enhanced external quantum efficiency and 83 times enhanced specific detectivity ( D * = 3.26 × 10 11 Jones). Remarkably, the unencapsulated BA 2 MAPb 2 I 7 /MAPbI 3 heterojunction is stable in ambient condition for > 300 days. The Q-2D/3D heterojunction shows suppressed ion inter-diffusion due to the presence of Q-2D phase.
研究领域:
材料科学
·
光电技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 1
·276-284
·
IF 2.302
Ding Jianxu,Du Songjie,Zhao Ying,Zhang Xiaojun,Zuo Zhiyuan,Cui Hongzhi,Zhan Xiaoyuan,Gu Yijie,Sun Haiqing
Single crystals of organolead trihalide perovskites (CH 3 NH 3 PbI 3 ) are supposed to be one of the most promising materials as photo-detectors. Because of their large absorption coefficient, long-range balanced electron, and hole-transport lengths, it is considered to break through the responsivity and efficiency. To systematically investigate the potentiality as photo-detector, high-quality CH 3 NH 3 PbI 3 single crystals with large size are highly demanded. In the paper, large CH 3 NH 3 PbI 3 single crystals with various crystal shapes were grown from γ-butyrolactone. At optimized precursor concentration and growth temperature, the growth rate was fixed at about 0.2 mm h −1 . Under such growth conditions, the growth steps, originated from screw dislocation on (100) facet, were revealed to be about 0.45 nm. This value is corresponded to half of the unit cell, implying the slow growth rate of (100) facet. With slow growth rate, the absorption edge of the CH 3 NH 3 PbI 3 single crystal was extended to 860 nm, correlated with a calculated bandgap of ~1.44 eV. By depositing a pair of Au electrodes, a metal–semiconductor–metal (MSM) photo-detector on the basis of the CH 3 NH 3 PbI 3 single crystal active layer (3 mm) was fabricated and its photo-response features were investigated systematically. About 2.531 A W −1 responsivity was obtained from the device under 780 nm laser illumination, while the external quantum efficiency reached to 396.20 %, better than some GaN, GaAs, and GaP photo-detectors with a MSM device structure.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
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