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Journal of rare Earths 2024年第3期42卷 464-472,I0002页

作者： Xiaopeng Hu Anlin Zhang Yufeng Du Li Zhou Changlin Li Jingjing Lian Zhequan Zou Xuan ouyang Bin Deng Lianwu Xie Ruijin Yu College of Chemistry Biology and Environmental Engineering Xiangnan UniversityChenzhou423043China College of Sciences Central South University of Forestry and TechnologyChangsha410004China College of Chemistry&Pharmacy Northwest A&F UniversityYangling712100China hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application Xiangnan UniversityChenzhou423043China

A novel layered perovskite tantalate phosphor Sr_(3)LaTa_(3)o_(12):Sm^(3+)(SLTo:Sm^(3+)) with orange-red emission was obtained for the first time via the solid-phase synthetic method. The phase purity, surface morphology,element distribution and luminescent properties of the SLTo:xSm^(3+)(x= 0.01 mol%-0.30 mol%) phosphors were investigated. Under 408 nm excitation, the optimum doped SLTo:0.10Sm^(3+) phosphor emits orangered light at 598 nm with the highest emission peak(4G_(5/2)→6H_(7/2)). The critical energy transfer distance is 1.687 nm. The prepared SLTo:0.10Sm^(3+)phosphor has excellent thermal stability with temperature quenching temperature(T_(0.5)> 500 K) and high activation energy(E_(a)= 0.25 e V). Through calculation, the chromaticity coordinates of all samples are concentrated in the orange-red area, and the color purity reaches 99%. The fabricated white light-emitting diode(w-LED) has a good correlated color temperature(5132 K), a high R_(a)(89), and the CIE chromaticity coordinates(0.340, 0.327). Consequently, the superiority of orange-red-emitting tantalate SLTo:Sm^(3+) phosphors for w-LEDs is demonstrated.

关键词： Tantalate Sr_(3)LaTa_(3)o_(12) Sm^(3+) Luminescence LED rare earths

The effect of secondary phase on corrosion behaviors of the titanium–zirconium–molybdenum alloy

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Tungsten 2024年第2期6卷 342-354页

作者： Song-Wei Ge Ping Hu Jie Deng Shi-Lei Li Hai-Rui Xing Jia-Yu Han Xing-Jiang Hua Li Wang Jun-Zhou Yang Bo Jin Wen Zhang Kuai-She Wang School of Metallurgy Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National and Local Joint Engineering research Center for Functional Materials Processing Xi’an University of Architecture and TechnologyXi’an 710055China Western Xinxing rare and precious metals Co. Ltd.Shangluo 726000China Northwest Institute for Non-Ferrous Metal research Xi’an 710016China

As the range of applications for molybdenum and its alloys has expanded,the corrosive environment for molybdenum alloys has become more demanding.In the past,the content of doping elements has been studied to investigate their infl uence on the corrosion performance of titanium–zirconium–molybdenum(TZM)alloys.In this paper,it is considered that the second phase in the alloy is the main factor aff ecting the corrosion performance of TZM alloys.By comparing the corrosion behavior of molybdenum metal and TZM alloy,the eff ect of the secondary phase on corrosion behaviors of TZM alloy has been investigated.The results show that the second phase reduces the corrosion resistance of the TZM alloy.The potential of the second phase is 73.7 mV higher than that of the Mo matrix,which contributes to the formation of microscopic electric couples.Under the action of microscopic electric couples,pitting corrosion is preferentially formed at the interface between the second phase and the matrix,which accelerates the corrosion of the matrix.This paper provides a theoretical basis for the application of TZM alloys in corrosive environments.

关键词： Secondary phase Electrochemical corrosion Titanium–zirconium–molybdenum(TZM) Galvanic corrosion Corrosion resistance

A covering liquid method to intensify self-preservation effect for safety of methane hydrate storage and transportation

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Petroleum Science 2022年第3期19卷 1411-1419页

作者： Jun Chen Yao-Song Zeng Xing-Yu Yu Qing Yuan Tao Wang Bin Deng Ke-Le Yan Jian-Hong Jiang Li-Ming Tao Chang-Zhong Chen hunan provincial key laboratory of xiangnan rare-precious metals compounds and applications College of Chemistry and Environmental ScienceXiangnan UniversityChenzhouHunan Province423000China School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng252059China SINoPEC research Institute of Safety Engineering 339 Songling RoadQingdao266000China

In this work,experiments and comprehensive insights into the proposed covering liquid method to intensify self-preservation effect for methane(CH_(4))storage are presented.The CH_(4)hydrate decomposition percentage was 17.6%with the pressure of 0.61 MPa after 12 h at 266.0 K without a covering liquid,which can be reduced to 12.4%,13.8%,13.0%,and 8.3%with the pressure of 0.26 MPa,0.33 MPa,0.51 MPa,and 0.37 MPa by covering with tetrahydrofuran(THF),cyclopentane(CP),cyclohexane,and n-tetradecane,respectively.When the temperature for CH_(4)hydrate decompositionwas 274.2 K,covering with THF,CP,cyclohexane,and n-tetradecane failed to inhibit CH_(4)hydrate decomposition.The results suggested that the covering liquid may form a new solid layer(a hydrate layer or other solidified layer)around the CH_(4)hydrate,which inhibit CH_(4)transfer below the freezing point of water.However,the new solid layer cannot resist the fast transfer of CH_(4)from decomposed CH_(4)hydrate above the freezing point of water.The same phenomenon was also observed in a sodium dodecyl sulfonate(SDS)-dry solution CH_(4)hydrate formation system.Therefore,the covering method can only intensify the self-preservation effect below the freezing point of water,but cannot generate a self-preservation effect.

关键词： Decomposition Inhibition Methane hydrate Method Self-preservation effect

Piezoelectric nanofoams with the interlaced ultrathin graphene confining Zn–N–C dipoles for efficient piezocatalytic H_(2) evolution under low-frequency vibration

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Journal of Energy Chemistry 2022年第6期31卷 115-122,I0004页

作者： Penghui Hu Yan Xu Yanhua Lei Jie Yuan Rui Lei Rong Hu Junkang Chen Difa Xu Shiying Zhang Ping Liu Xiangchao Zhang Xiaoqing Qiu Wenhui Feng These authors contributed equally to this work.a.hunan Province key laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022HunanChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina State key laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116FujianChina hunan provincial key laboratory of xiangnan rare-precious metals compounds and application Department of Chemistry and Life ScienceXiangnan UniversityChenzhou 423000HunanChina

Unique nanofoams consisting of interweaved ultrathin graphene confining Zn–N–C dipoles (ZnNG) are constructed via calcination of Zn-coordinated precursor.Due to the introduction of local polar Zn–N–C configurations,with hypersensitivity for mechanical stress,the piezoelectricity is created on the nonpiezoelectric graphene,and the hierarchical ZnNG exhibits obvious piezocatalytic activity of water splitting for H_(2) production even under mild agitation.The corresponding rate of H_(2) production is about 14.65 μmol g^(-1)h^(-1).It triggers a breakthrough in piezocatalytic H_(2) evolution under low-frequency vibration,and takes a significant step forward for piezocatalysis towards practical applications.Furthermore,the presented concept of confining atomic polar configuration for engineering piezoelectricity would open up new horizon for constructing new-type piezoelectrics based on both piezoelectric and nonpiezoelectric materials.

关键词： Piezocatalysis Water splitting for H_(2)production Low-frequency vibration Ultrathin graphene confining Zn–N–C dipoles

Synthesis and optical properties of novel apatite-type NaCa_(3)Bi(Po_(4))_(3)F:Dy^(3+)yellow-emitting fluorophosphate phosphors for white LEDs

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Journal of rare Earths 2022年第12期40卷 1827-1836,I0001页

作者： Yuan Wang Guangliang Lu Yang Qiu Wen Sun Siqi Qin Yifang Lin Bin Deng Dan zhang Ruijin Yu College of Science Northwest A&F UniversityYangling 712100China School of Chemistry and Environmental Science Xiangnan UniversityChenzhou 423043China hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application Xiangnan UniversityChenzhou 423043China College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China key laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichang 443002China

In this study,novel yellow-emitting fluorophosphate NaCa_(3)Bi(Po_(4))_(3)F phosphors doped with different concentrations of Dy^(3+)ions were first obtained via high-temperature solid-state reaction.The crystal structure,phase purity,particle morphology,photoluminescence(PL)properties,thermal stability,and luminescence decay curves of the resulting phosphors were then characterized in detail.Under the excitation of 349 nm,the three dominant peaks of the NaCa_(3)Bi(Po_(4))_(3)F:Dy^(3+)are centered at 480 nm(^(4)F_(9/2)-^(6)H_(15/2)),577 nm(^(4)F_(9/2)-^(6)H_(13/2)),and 662 nm(^(4)F_(9/2)-^(6)H_(11/2)).The optimal doping concentration of Dy^(3+)ions in the NaCa_(3)Bi(Po_(4))_(3)F:xDy^(3+)phosphors is x=5 mol%.The phosphors show excellent thermal stability with high activation energy(Ea=0.32 eV).Eventually,the synthesized white lightemitting diode(w-LED)demonstrates the Commission International de L’Eclairage(CIE)chromaticity coordinates of(0.341,0.334),a good correlated color temperature(CCT)of 5083 K,and a high color rendering index(Ra)of 92.Revealing its potential as yellow-emitting phosphors,the feasibility of the fabricated apatite-type NaCa_(3)Bi(Po_(4))_(3)F:Dy^(3+)fluorophosphate phosphors was confirmed for wLEDs.

关键词： Fluorophosphate NaCa_(3)Bi(Po_(4))_(3)F Dy^(3+) Luminescence Phosphor LEDs

Multi-site occupancies and luminescence properties of cyan-emitting Ca_(9-x)NaGd_(2/3)(Po_(4))_(7):Eu^(2+)phosphors for white light-emitting diodes

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Journal of rare Earths 2022年第2期40卷 243-252,I0003页

作者： Shihua Liu Bin Deng Junhui Yang Jinhua Liu Jun Chen Fanhua Zeng Huanyou Wang Ruijin Yu Gongguo Zhang College of Chemistry&Pharmacy Northwest A&F UniversityYangiing 712100China College of Chemistry&Biology and Environmental Engineering Xiangnan UniversityChenzhou 423043China hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application Chenzhou 423043China key laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichang 443002China Department of Chemistry and Chemical Engineering Jining UniversityQufir 273155China

Cyan-emitting Ca_(9)NaGd_(2/3)(Po_(4))_(7):Eu^(2+)phosphors were synthesized via high temperature solid-state route.X-ray powder diffraction(XRD)and scanning electron microscopy(SEM)were used to verify the phase and morphology of the Ca_(9)NaGd_(2/3)(Po_(4))_(7):Eu^(2+)(CNGP:Eu^(2+))phosphors.The as-obtained phosphor exhibits a broad excitation band of 250-420 nm,which is near the ultraviolet region.An intense asymmetric cyan emission at 496 nm corresponds to the 5 d-4 f transition of Eu^(2+).The multiplesite luminescent properties of Eu^(2+)ions in CNGP benefit from versatile structure ofβ-Ca3(Po4)2 compounds.The effective energy transfer distance is 5.46 nm(through the spectral overlap calculation),validating that the resonant energy migration type is via dipole-dipole interaction mechanism.Compared to the initial one at room temperature,the luminescent intensity of CNGP:Eu^(2+)phosphor can maintain 77%as it is heated up to 420 K.A white light-emitting diode(WLED)with excellent luminesce nt properties was successfully fabricated.Moreover,the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.

关键词： Phosphate Luminescence Eu^(2+)ion Ca_(9-x)NaGd_(2/3)(Po_(4))_(7) rare earths

Lateral organic-inorganic hybrid Vis-NIR photodetectors based on GaN nanowires promoting photogenerated carriers transfer

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Journal of Materiomics 2022年第4期8卷 806-814页

作者： Tao Han Zexin Wu Zhilong Deng Xiaofeng Zhang Sidi Yang Cuicui Chen Jiajia Zhu Shufang Ding Chunzhi Jiang hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application School of Physics and Electronic Electrical EngineeringXiangnan UniversityChenzhou423000China Department of Mechanical Engineering City University of Hong KongHong Kong999077China National Engineering laboratory for Modern Materials Surface Engineering Technology&the key Lab of Guangdong for Modern Surface Engineering Technology Guangdong Institute of New MaterialsGuangzhou510650China

The narrow bandgap of the low-energy near-infrared(NIR)polymer would lead to overlap between adjacent energy levels,which is a major barrier to the preparation of Vis-NIR polymer bulk hetero-junction(BHJ)photodetectors with small responsivity and photocurrent.In this study,a high-performance lateral inorganic-organic hybrid photodetector was constructed to eliminate this barrier by combining GaN nanowires(GaN-NWs)with PDPP3T:PC61BM-based BHJ.In stage one,high-quality GaN-NWs were synthesized by the catalyst-free CVD method.The mechanism for controlling GaN-NWs morphology by adjusting the NH3 flow rate was revealed.In stage two,the GaN-NWs with large electron mobility were used to accelerate the transfer of photogenerated carriers in the BHJ layer.Finally,compared with the BHJ device,the BHJ/GaN device demonstrated obvious improvements in responsivity and photocurrent at the wavelength between 400 and 1000 nm.The responsivity and photocurrent increased over 20-fold at the NIR band of 800e900 nm.Besides,owing to the energy level gradient effect,the BHJ/GaN device has a response speed of 7.8/over three orders of magnitude than that of the GaN-NWs-based device(tr/tf:7.1/10.9 s).Therefore,the novel device structure proposed in this work holds great potential for preparing high-performance Vis-NIR photodetectors.

关键词： Vis-NIR photodetectors Lateral photodetectors GaN nanowires Bulk heterojunction organic-inorganic hybrid organic materials

Spectral properties and Judd-ofelt analysis of novel red phosphors Gd_(2)InSbo_(7):Eu^(3+)with high color purity for white LEDs

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Journal of rare Earths 2021年第11期39卷 1327-1335,I0001页

作者： Yu Wang Baokui Zhao Bin Deng Shanshan Chen Yuanyuan Liu a Guodong Wang Ruijin Yu College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China College of Science Northwest A&F UniversityYangling 712100China College of Chemistry&Biology and Environmental Engineering Xiangnan UniversityChenzhou 423043China hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application Chenzhou 423043China

Gd_(2)InSbo_(7):Eu^(3+)red phosphors we re successfully synthesized via high-temperature solid-state reactio n.The phase purity,particle size,and luminescence properties of obtained phosphors were measured and analyzed in detail.The Gd_(2)InSbo_(7)lattice possesses cubic structure with F_(d-3 m)(227)space group.The phosphors emit bright red emission at 628 nm under 393 nm excitation,and this phenomenon is attributed to the^(5)D0-^(7)F_(2)transition.The Judd-ofelt parameters(Ω_(2),Ω_(4)),transition ratio,and branching ratios(β)of Eu^(3+)-doped Gd_(2)InSbo_(7)phosphor were calculated on the basis of the emission spectra and decay lifetimes.The optimal content in Gd_(2)InSbo_(7):xEu^(3+)is identified to be 15 mol%.The thermal quenching of Gd_(2)InSbo_(7):Eu^(3+)is found to be over 500 K,and its activation energy is 0.26 eV.The Commission Internationale de l’Eclairage(CIE)chromaticity coordinates of Gd_(2)InSbo_(7):15%Eu^(3+)are(0.629,0.371),which are close to ideal red chromaticity coordinates(0.670,0.330).The fabricated w-LED exhibits good color rendering index(Ra)(86),correlated color temperature(CCT)(6997 K),and CIE chromaticity coordinates(0.302,0.330).The obtained results demonstrate that Gd_(2)InSbo_(7):Eu^(3+)phosphors have potential applications in white LEDs.

关键词： Luminescence Phosphor Antimonate Gd_(2)InSbo_(7) rare earths

Photoluminescence properties and thermal stability of Eu^(3+)-activated La_(7)Ta_(3)W_(4)o_(30) red-emitting phosphors for near-UV-excited w-LEDs

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Journal of rare Earths 2021年第8期39卷 905-912页

作者： Yu Ren Bin Deng Ting Liang Shuang Shu Junlan Guo Shoucheng Zhao Ruijin Yu College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China College of Chemistry&Biology and Environmental Engineering Xiangnan UniversityChenzhou 423043China hunan provincial key laboratory o/xiangnan rare-precious metals compounds research and application Xiangtan UniversityChenzhou 423043China College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China

Novel trivalent europium(Eu^(3+))-activated La_(7)Ta_(3)W_(4)o_(30):xEu^(3+)(x=0.5 mol%-40 mol%) red-emitting phosphors were synthesized by means of a high-temperature solid-state reaction.The structure,morphology,photoluminescence,thermal-stability properties,lifetime,and color-rendering of the prepared phosphors were investigated in detail.The La_(7)Ta_(3)W_(4)o_(30):Eu^(3+) phosphors show five emission peaks under near-ultraviolet(n-UV) at 397 nm,and these peaks are ascribed to the transitions of ^(5)D0-^(7)Fj(j=0,1,2,3 and 4) by Eu^(3+) ions.The optimal doping concentration of Eu^(3+) is 20 mol%,and the critical distance of the energy transfer between the Eu^(3+)ions was calculated to be 1.768 nm.The quenching temperature(T_(0.5)) of La_(7)Ta_(3)W_(4)o_(30):20 mol%Eu^(3+) is about 440 K.The quantum yield(QY) was measured to be 85.85%.The fabricated white-light-emitting diodes(w-LEDs) possess high color-rendering index(R_(a)) of 90,and high correlated color temperature(CCT) of 5810 K,respectively.The Commission Internationale de L’Eclairage(CIE) coordinates are(0.311,0.322).Therefore,the prepared phosphor has a promising application for w-LEDs.

关键词： Luminescence Phosphor Tungstate La_(7)Ta_(3)W_(4)o_(30) rare earths

Synthesis and optical properties of novel double perovskite Ca_(2)MgTeo_(6):Dy^(3+),Na^(+) phosphors for white LEDs

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Journal of rare Earths 2021年第6期39卷 634-642,I0001页

作者： Junzhi Che Bin Deng Qinyang Song Jianxu Wang Tao Wang Shoucheng Zhao Ruijin Yu College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China College of Chemistry&Biology and Environmental Engineering Xiangnan UniversityChenzhou 423043China hunan provincial key laboratory of xiangnan rare-precious metals compounds research and application Chenzhou 423043China key laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichang 443002China

Novel yellow-emitting phosphors of Dy^(3+)-doped double perovskite Ca_(2)MgTeo_(6) were synthesized by using a conventional high-temperature solid-state reaction.The phase purity,particle morphology,size distribution,elemental composition,luminescence properties,and luminescence decay curves of the resulting products were then analyzed in detail.The Ca_(2)MgTeo_(6):Dy^(3+),Na^(+) phosphors show three emission peaks after near-ultraviolet excitation at 350 nm,which correspond to ^(4)F_(9/2)→^(6)H_(11/2),^(4)F_(9/2)→^(6)H_(13/2),and ^(4)F_(9/2)→^(6)H_(13/2) transitions,respectively.Among them,the strongest peak is observed at 573 nm.The best doping content of Dy^(3+)in Ca_(2)MgTeo_(6):xDy^(3+),xNa^(+) phosphors is x=5 mol%.The calculated critical distance of energy transfer between Dy^(3+) ions is 1.6 nm.Luminescence quenching is confirmed to be due to dipole-dipole interactions among Dy^(3+) ions.The phosphors show excellent thermal stability with high activation energy(0.27 eV).The Commission Internationale de l’Eclairage(CIE) chromaticity coordinates of the Ca_(2)MgTeo_(6) Dy^(3+),Na^(+) phosphors are located in the yellow region.White light-emitting diodes(w-LEDs) were fabricated with a high color rendering index(R_(a)) of 88 and a good correlated color temperature(CCT) of 5440 K.All observed properties indicate that Ca_(2)MgTeo_(6):Dy^(3+),Na^(+) phosphors have potential applications in display and photonic devices.

关键词： Luminescence Double perovskite Ca_(2)MgTeo_(6) Phosphor rare earths