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Glass crystallization making red phosphor for high-power warm white lighting

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Light(Science & Applications) 2021年第4期10卷 570-581页

作者： Tao Hu Lixin Ning Yan Gao Jianwei Qiao Enhai Song Zitao Chen yayun zhou Jing Wang Maxim S.Molokeev Xiaoxing Ke Zhiguo Xia Qinyuan Zhang School of Physics and Optoelectronics State Key Laboratory of Lum inescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouGuangdongChina Anhui Key Laboratory of Optoelearic Materials Science and Technology Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Normal UniversityWuhuAnhuiChina School of Applied Physic and Materials Wuyi UniversityJiangmenGuangdongChina Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and TechnologiesKLGHEI of Environment and Energy ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhouGuangdongChina Laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASKrasnoyarskRussia Siberian Federal University KrasnoyarskRussia Research and Developm ent Department Kemerovo State UniversityKemerovoRussia lnstitute of Microstructure and Property of Advanced Materials Beijing University of Technology BeijingBeijingChina

Rapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence,and especially relies on blue light pumped red phosphors for improved light ***,we discovered an unprecedented red-emitting Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor(λex=450 nm,λem=620 nm)via the crystallization of MgO-AI_(2)O_(3)-Sio_(2) aluminosilicate *** experimental measurement and first-principles calculations verify that Eu^(2+)dopants insert at the vacant channel of Mg_(2)AI_(4)Si_(5)0_(18)crystal with six-fold coordination responsible for the peculiar red ***,the resulting phosphor exhibits high internal/external quantum efficiency of 94.5/70.6%,and stable emission against thermal quenching,which reaches industry *** maximum luminous flux and luminous efficiency of the constructed laser driven red emitting device reaches as high as 274 Im and 54lm W^(-1),*** combinations of extraordinary optical properties coupled with economically favorable and innovative preparation method indicate,that the Mg_(2)AI_(4)Si_(5)0_(18):Eu^(2+)composite phosphor will provide a significant step towards the development of high-power solid-state lighting.

关键词： power pumped lighting

Mn4+ Doped Narrowband Red Phosphors with Short Fluorescence Lifetime and High Color Stability for Fast-Response Backlight Display Application

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Mn4+ Doped Narrowband Red Phosphors with Short Fluorescence ...

中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： Yuanjing Wang yayun zhou Enhai Song Hong Ming Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology

Mn-activated narrow-band red phosphors are the key materials for wide-gamut displays,however,it is a great challenge to develop the phosphor that adapts to the new requirements of fast response and color ***,red phosphors CsB’ScF:Mn(CB’SFM,B’=Na,K,Rb and Cs) with short fluorescence lifetime (2.06～4.13 ms) and weak intensity of temperature-sensitive zero phonon line (ZPL) emission have been *** phosphors can avoid display tailing phenomenon and color shift under different working *** density functional theory (DFT) calculations show that Mntends to substitute for Scand form a Csvacancy V() for charge compensation,which would cause appropriate local environment distortion of Mn,resulting in short PL lifetime as well as weak ZPL emission in(a).Furthermore,on the basis of the luminescence kinetics,a modified thermal quenching evaluation model is further proposed to evaluate the thermal stability of the doped *** w-LED device fabricated with the CsKScF:Mn,green phosphorβ-Sialon and blue chip can achieve a color gamut above 105%of the National Television System Committee (NTSC)standard value,suggesting red phosphor CsKScF:Mnhas potential application in the new generation of fast-response and color stable displays.

关键词： Mn4+ short fluorescence lifetime color stability fast-response displays

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预处理生物质的热解实验研究

东南大学学报（自然科学版） 2016年第2期46卷 317-325页

作者：周亚运肖军吕潇沈来宏东南大学能源热转换及其过程测控教育部重点实验室南京210096

通过分步添加Ca（OH）2与甲酸获得甲酸钙的方法对生物质进行预处理,在管式炉上开展了预处理生物质热解实验,研究了甲酸钙预处理对4种生物质热解特性的影响.样品的红外分析显示,甲酸钙预处理影响了纤维素和半纤维素的结构,一定程度上破... 详细信息

通过分步添加Ca（OH）2与甲酸获得甲酸钙的方法对生物质进行预处理,在管式炉上开展了预处理生物质热解实验,研究了甲酸钙预处理对4种生物质热解特性的影响.样品的红外分析显示,甲酸钙预处理影响了纤维素和半纤维素的结构,一定程度上破坏了乙酰基侧链,而对木质素苯环结构影响较小,且出现了明显的羧酸根官能团振动.热解实验结果表明：木屑的生物油产率高于3种秸秆类生物质（玉米秆、稻秸、麦秆）,最大生物油产率达到0.496 g/g.甲酸钙预处理使得生物质的半焦和气体产率增加,而生物油产率下降.GC-MS分析显示,木屑生物油酸类含量低于秸秆类生物质,而酚类物质含量较高,其中麦秆生物油酸类含量最高,酸度最强.甲酸钙预处理明显减少了生物油中乙酸和左旋葡聚糖的含量,增加了羟基丙酮与环戊烯酮等酮类物质;而且甲酸钙预处理显著降低了生物油的酸性,且对秸秆类生物质的改善作用更加明显,其中木屑生物油p H值从4.1~4.3增加到5.6~5.8,麦秆生物油从2.4~2.7增加到5.0~5.3.

关键词：生物质热解预处理甲酸钙

A general ammonium salt–assisted synthesis strategy for Cr3+ doped hexafluorides with highly efficient near infrared emissions

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A general ammonium salt–assisted synthesis strategy for Cr3...

中国稀土学会2021学术年会

作者： Song Enhai He Fanquan zhou yayun Zhiguo Xia Zhang Qinyuan State Key Laboratory of Luminescent Material and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices South China University of Technology

The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and the emerging ***,a series of NIR emission hexafluorides ABMF:Cr(A=Na,K,Rb,Cs;B=Li,Na,K,Cs;M=Al,Ga,Sc,In) peaking at～733-801 nm with a full width at half maximum (FWHM) of～98-115 nm are synthesized by a general ammonium salt–assisted synthesis *** from the pre-ammoniation of the trivalent metal sources,the Crcan be more efficiently doped into the ABMF and simultaneously prevent the generation of competitive ***,NaScF:Cr(λ=774 nm,FWHM=～108 nm) with optimal Crdoping concentration of 35.96%shows a high internal quantum efficiency of 91.5%and an external quantum efficiency of～40.82%.A lighting emitting diode(LED) device with a NIR output power of～291.05 m W at 100 m A driven current and a high photoelectric conversion efficiency of 20.94%is *** general synthesis strategy opens up new avenues for the exploration of Crdoped high efficiency phosphors,and the as-obtained record NIR output power demonstrates for NIR LED lighting sources applic

关键词： High efficiency Cr3+ hexafluoride NIR LED lighting sources

Photon Upconversion Afterglow material toward Visual Information Coding/Decoding

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Photon Upconversion Afterglow material toward Visual Informa...

中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： Xinxin Han Enhai Song yayun zhou Tao Hu Zhiguo Xia Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Key Lab of Featured Metal Resources Utilization and Advanced Materials Development Nano and Energy Research Center School of Physics Guangxi University

The development of luminescent material with visual afterglow plays a crucial role in information ***,a long-lived phosphor KCaF:Yb,Mnwith visualized photon upconversion (UC) afterglow is *** UC emission spectrum consists of a high color purity (～99.33%) yellow emission band peaking at～570 nm,and the UC afterglow signal can be observed by naked eye in both bright and dark fields even at a high temperature of 200℃.Moreover,the demonstration background and pigments have little influence on the UC afterglow *** density functional theory (DFT) calculations and the up-/down-conversion luminescence characteristics suggest that the UC afterglow is originated from the long-lived exchange coupled Yb-Mndimers formed in KCaF:Yb,Mn,which is independent on the conventional"afterglow trap".The random distribution characteristics of Mn,and the oxygen ion (O) introduced by Ybnon-equivalent doping are the key factors for forming the efficient UC emission center in this *** the photon UC afterglow phosphor in screen printing ink,a visualized information encoding/decoding prototype suitable for both human and machine fast identification is demonstrated.

关键词： Mn2+ upconversion long-lived emission anti-counterfeiting information encryption

Three Birds with One Stone:K2SiF6:Mn4+ Single Crystal Phosphors for the High-Power and Laser-Driven Lighting

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Three Birds with One Stone:K2SiF6:Mn4+ Single Crystal Phosph...

中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： yayun zhou Changkai Yu Enhai Song Yuanjing Wang Hong Ming Zhiguo Xia Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Department of Physics Fudan University

Narrow-band red-emitting fluoride phosphors play crucial roles in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K2 SiF6:Mn4+(KSFM) single crystal phosphors with tunable sizes(20 ～ 1000 μm) have been grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn4+-rare interface layer in KSFM single crystals enables the simultaneous fulfillment of the high external quantum efficiency, excellent moisture, improved thermal quenching and dissipation for the high-power and laser-driven lighting applications. As a prototype, a warm white laser diode device with a high luminous flux of 202.7 lm and CCT of 3277 K, as well as a Ra of 87.9 has been presented. This work provides new insights into the development of highly efficient and stable materials for advanced lighting applications.

关键词： Single crystal phosphor Red emission High-power White LEDs Laser lighting

Doping Luminescent Centers in Organic-inorganic Hybrid Fluorides: A Guanidinium-based Mn4+-doped Red-emitting Hybrid Phosphor with High Stability

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Doping Luminescent Centers in Organic-inorganic Hybrid Fluor...

中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： Hong Ming Yifei Zhao yayun zhou Shuai Zhang Yuanjing Wang Enhai Song Zhiguo Xia Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology

The last decade has seen Mn-activated fluorides emerge as a research hotspot in the field of inorganic phosphors,where great efforts have been put in search of new host materials that better suit the requirements for phosphor-converted white light-emitting diodes (pc-WLEDs).Herein,a general organic-inorganic hybridization strategy is demonstrated in Mn,Cror Eu-doped guanidinium-based hybrid fluorides to obtain a brand-new kind of host materials for luminescence centers,among which GAAlF:Mn(where GA represents the guanidinium cation[C(NH)])was selected as an example to reveal their excellent *** functional theory calculations suggested a wide band gap of GAAlF (～5.24 eV) and that Finterstitials are generated to balance the charge difference caused by the non-equivalent doping of *** GAAlF:Mnhybrid can sustain～300°C high temperature without degradation,and only 8%of the original luminescent intensity was lost at～348 K.A pc-WLED with wide color gamut of108.3%National Television System Committee standard (NTSC) was fabricated with GAAlF:Mn,suggesting its potential in high-quality backlight *** work not only brings a brand-new kind of host materials to the fluoride-based phosphor family,but also may provide great guiding significance for designing fluoride-based functional materials containing hybrid structure.

关键词： Mn4+ phosphor Cr3+ phosphor organic-inorganic hybrid fluoride

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响应动态约束条件的多目标货位优化算法研究

智能系统学报 2020年第5期15卷 925-933页

作者：项前周亚云陆枳屹余玉风东华大学机械工程学院上海201620

针对自动化立库货位决策与优化问题,考虑到优化目标多样、托盘使用状态及可分配货位动态变化等因素,提出了一种响应动态约束条件的多目标货位优化算法。以巷道作业均衡、货架重心稳定及作业路径最短建立多目标优化模型,基于变异系数自... 详细信息

针对自动化立库货位决策与优化问题,考虑到优化目标多样、托盘使用状态及可分配货位动态变化等因素,提出了一种响应动态约束条件的多目标货位优化算法。以巷道作业均衡、货架重心稳定及作业路径最短建立多目标优化模型,基于变异系数自适应差分进化算法,使用货位随机数编码,根据实时货位可行域进行个体解码,以响应动态货位约束条件。提出了基于层次分析的Pareto解评价方法,从而获得多批作业货位持续优化的目标权重,为仓储货位决策提供合理方案。多批作业算法实验结果表明:所提算法效果显著优于多目标简单加权算法,能够有效应用于动态货位决策与优化。

关键词：自动化立体仓库货位优化动态约束持续优化差分进化变异系数自适应层次分析法多目标 Pareto解

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Authorware在练习课件中的应用

电脑知识与技术 2008年第S1期 79-80页

作者：周亚云广东江门广播电视大学

在程序设计中,利用Authorware的交互特性,巧妙地利用图标并适当地使用系统变量及自定义变量,就能开发出程序简单和动态交互性能极强练习课件。

关键词： AUTHORWARE 程序设计练习课件