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Journal of Rare Earths 2023年第8期41卷 1127-1134,I0001页

作者： Qing Lin tongyu gao Yuanhong Liu Ronghui Liu Siwei Chen Xiaole Ma Chunlei Zhao National Engineering Research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

Red phosphor,with longer wavelength,is highly desirable for full-spectrum *** deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural *** correlations among structural evolution,crystal-field environment,and luminescence properties were *** Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and *** further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and *** above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.

关键词： Full-spectrum WLEDs Structural modulation Deep red phosphor Rare earths

Broadband near-infrared luminescence and energy transfer of Cr^(3+),Ce^(3+) co-doped Ca_(2)LuHf_(2)Al_(3)O_(12) phosphors

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Journal of Rare Earths 2021年第3期39卷 269-276,I0002页

作者： Jinpin Wu Weidong Zhuang Ronghui Liu Yuanhong Liu tongyu gao Chunpei Yan Min Cao Junhang Tian Xiaoxia Chen National Engineering Research Center for Rare Earth Materials GRINM Croup Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of ChemistryBiology and Materials ScienceEast China University of TechnologyNanchang 330046China

Broadband near-infrared phosphors are highly desirable for food *** Ca_(2)LuHf_(2)Al_(3)O_(12):Cr^(3+)(CLHA:Cr^(3+)) and Ca_(2)LuHf_(2)Al_(3)O_(12):Ce^(3+),Cr^(3+)(CLHA:Ce^(3+),Cr^(^(3+))) phosphors were synthesized by the conventional high-temperature solid state *** CLHA:Cr^(3+)phosphor,with a good thermal stability,shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr^(3+)*** co-doped sample,the emission intensity of Cr^(3+)can be enhanced by three times due to the energy transfer from Ce^(3+)to Cr^(3+),which can be evidenced by a significant overlap between the PLE of Cr^(3+)single-doped phosphor and the PL of Ce^(3+)single-doped *** addition,the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay Lifetime and Dexter’s energy transfer *** broadband NIR emission peaked at 775 nm of CLHA:Cr^(3+),Ce^(3+)phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

关键词： Broadband near-infrared Energy transfer Garnet phosphor Rare earths

Blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) phosphors for high CRI white LEDs

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Journal of Rare Earths 2021年第6期39卷 627-633,I0001页

作者： Yipeng Zhou Yunsheng Hu Ronghui Liu Yuanhong Liu Weidong Zhuang Min Cao tongyu gao Junhang Tian Yanfeng Li Guantong Chen National Engineering Research Center for Rare Earth Materials GRINM Group Co.Ltd.Beijing100088China CRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

A broadband blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+)(x=0-0.2) phospho rs were synthesized,which can be used for near-UV pumped white light-emitting diodes(w-LEDs).The crystal structures,photoluminescence pro perties,external quantum efficiency,the rmal stability and application perfo rmance of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+),by partially substituting Sr^(2+) with Ca^(2+)(x=0-0.2),were studied by various analytical *** the Ca/Sr ratio of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) gradually increases,the emission peak of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) red-shiftes from 459 to 465 nm,corrected external quantum efficiency increases from 31.8% to 42.9%,and the thermal stability is also *** mechanism of the changes of the photoluminescence emission and excitation spectra,external quantum efficiency and thermal stability properties was also investigated in *** addition,a w-LED was fabricated by using SrLu_(2)O_(4):Ce^(3+)(blue),β-sialon:Eu^(2+)(green) and(Sr,Ca)AlSiN_(3):Eu^(2+)(red) phosphors combined with a 405 nm near-UV LED chip,and its color rendering index(CRI) reaches *** Sr_(0.8)Ca_(0.2)Lu_(2)O_(4):Ce^(3+) is applied as blue phosphor to substitute SrLu_(2)O_(4):Ce^(3+),the obtained w-LED devices have high luminous efficiency,and CRI greater than *** re sults show that the Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) can be potential blue phosphors for n-UV pumped high CRI w-LEDs application.

关键词： n-UV pumped w-LED Blue phosphor Red shift Excellent thermal stability High color rendering index Rare earths

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京郊京白梨果园生产系统碳源/汇特征分析

干旱区资源与环境 2017年第10期31卷 144-149页

作者：杨自立顾慈阳高同雨北京市门头沟区科学技术委员会北京102300

作为一类农业生产系统,果园在森林生态系统碳循环中扮演着重要角色。本研究以北京市门头沟区军庄镇孟悟村京白梨标准化生产示范基地为对象,对其2015年度的碳源/汇特征进行了分析。结果表明:该生产系统碳排放总量为7502.40kg Ce,强度为37... 详细信息

作为一类农业生产系统,果园在森林生态系统碳循环中扮演着重要角色。本研究以北京市门头沟区军庄镇孟悟村京白梨标准化生产示范基地为对象,对其2015年度的碳源/汇特征进行了分析。结果表明:该生产系统碳排放总量为7502.40kg Ce,强度为375.12kg Ce/hm2,灌溉消耗电能造成的碳排放占总量比例最高,为46.76%;系统内植被碳吸存总量为57979.02kg C,强度为2898.95kg C/hm2,果园套种作物对系统碳吸存贡献最大,占总量的79.47%;系统碳效率为7.73kg C/kg Ce。总体上,该生产系统为碳汇,具备较强的生产可持续性,同时,实施果树节水灌溉,借助雨洪利用工程减少果园灌溉对地下水的依赖,及合理套种林下作物,是进一步提升其节碳增汇水平的有效途径。

关键词：低碳农业碳排放碳吸存碳效率生产系统京白梨果园

基于Scopus和Scival稀土光功能材料研究现状和热点分析

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中国稀土学报 2021年第6期39卷 840-848,I0001页

作者：史冬梅刘龑龙高彤宇刘荣辉科学技术部高技术研究发展中心北京100044 有研科技集团有限公司稀土材料国家工程研究中心北京100088

稀土光功能材料是稀土材料领域重点发展的方向之一。为了全面分析稀土光功能材料领域研究现状及热点,基于Scopus数据库和Scival科研管理分析平台,以"rare earth"为检索词,对2015~2020年7月稀土材料发表的科技文献进行检索,并筛选出稀土... 详细信息

稀土光功能材料是稀土材料领域重点发展的方向之一。为了全面分析稀土光功能材料领域研究现状及热点,基于Scopus数据库和Scival科研管理分析平台,以"rare earth"为检索词,对2015~2020年7月稀土材料发表的科技文献进行检索,并筛选出稀土光功能材料的相关文章。经统计,稀土光功能材料发文量4001篇,涉及31个相关主题,位居各类稀土材料主题数量和论文数量第一。归纳总结了不同国家地区、发文机构以及作者在稀土光功能材料领域的发文情况;详细分析研究了稀土光功能材料涉及的5个研究方向的研究现状及热点等情况;同时,针对上述统计结果,以提升研究水平和学术影响力为目的对中国稀土光功能材料领域的研究提供发展建议。

关键词：稀土光功能材料 Scival Scopus 研究现状热点

论魏晋时期的山水之美--以宗炳《画山水序》为例

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艺术科技 2021年第10期34卷 167-168页

作者：高童宇贵州大学哲学与社会发展学院贵州贵阳550025

受“道法自然”思想的影响,魏晋时期纵情山水成为一种普遍自觉的生活方式。站在自然审美角度,魏晋时期的山水之美体现为观者与山水间互相展开之美,观者不仅感受到山水的形质之美,还通过对山水之道的体悟而发现山水之道与人之道相通,在... 详细信息

受“道法自然”思想的影响,魏晋时期纵情山水成为一种普遍自觉的生活方式。站在自然审美角度,魏晋时期的山水之美体现为观者与山水间互相展开之美,观者不仅感受到山水的形质之美,还通过对山水之道的体悟而发现山水之道与人之道相通,在这种相通中,人发现了生命精神之美。这就意味着自然审美形式的向外拓展,一方面为自然审美转型拓展了思路,但另一方面却不利于自然审美独立性的培养。

关键词：形质之美生命精神审美形态《画山水序》

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阳角挡土墙受力特性数值分析

路基工程 2014年第4期 170-173页

作者：高同玉中油辽河工程有限公司辽宁盘锦124010

工程中的挡土墙在阳角处经常出现裂缝,既影响外表美观,又给人不安全感。针对这一现象,采用有限差分软件FLAC3D,对阳角挡土墙进行受力特性分析。通过分析可以发现,在阳角处具有明显不同于平面应变问题的空间受力特性,墙体存在不同程度的... 详细信息

工程中的挡土墙在阳角处经常出现裂缝,既影响外表美观,又给人不安全感。针对这一现象,采用有限差分软件FLAC3D,对阳角挡土墙进行受力特性分析。通过分析可以发现,在阳角处具有明显不同于平面应变问题的空间受力特性,墙体存在不同程度的拉应力,导致墙体产生拉伸裂缝。基于这一特点提出了设计时在阳角处可以采取的预防措施,即在挡土墙的阳角处设置伸缩缝防止开裂。

关键词：阳角挡土墙裂缝数值分析预防措施