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Green and red phosphor for LED backlight in wide color gamut LCD

Journal of Rare Earths 2020年第1期38卷 1-12页

作者： Yunpeng Zhang Lin Luo guantong chen Yuanhong Liu Ronghui Liu Xiaochun chen Beijing University of Chemical Technology Beijing 100029China National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co.Ltd.Beijing 100088China

Wide color gamut(WCG) backlight for liquid crystal display(LCD) utilizing white light-emitting diodes(LED) has attracted considerable attention for their high efficiency and color *** this review,recent developments in crystal structure,luminescence and applications of phosphors for wide color gamut LED backlight are *** novel red phosphors,Mn4+activate fluoride and aluminate phosphors are advanced in quantum efficiency,thermal quenching and color saturation for their characteristic spectrum with broad excitation band and linear *** crystal structure and fluorescence properties of Mn4+doped fluosilicate,fluorogermanate,fluotitanate,as well as Sr4 Al14O25,CaAl12O19 and BaMgAl10O17 phosphors are discussed in detail.A serial of narrow-band red-emitting Eu2+,Eu3+and Pr3+-doped nitride silicates and molybdate phosphors are also ***-earth-doped oxynitride and silicate green-emitting phosphors have attracted more and more attention because of the wide excitation,narrow emission,high quenching temperature,high quantum efficiency,such as β-sialon:Eu2+,Ba3Si6O12N2:Eu2+,MSi2O2N2:Eu2+(M=Ca,Sr,Ba),y-AlON:Mn2+and Ca3Sc2Si3O12:Ce3+.All above phosphors demonstrate their adaptability in wide color gamut LCD *** for Mn4+doped fluosilicate red phosphor and β-sialon:Eu2+green *** achieve an ultra-high color gamut in white LED backlight and against the OLED,innovative narrow-band-emission red and green phosphor materials with independent intellectual property rights are continuously pursed.

关键词： Wide color gamut Backlight Liquid crystal display Phosphor White LED Rare earths

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Photoluminescent properties of tunable green-emitting oxynitride （Baa-xSrx）Si6012N2 ：Eu2＋ phosphor and its application in white LEDs

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Journal of Rare Earths 2013年第10期31卷 944-949页

作者： guantong chen Weidong ZHUANG Ronghui LIU Yuanhong LIU Yunsheng HU Huaqiang HE National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd. Beijing 100088 China

Green emitting Eu2＋-doped （Ba3_xSrx）Si6012N2 solid solutions were synthesized through solid state reaction at 1350 ℃ for 10 h under a N2/H2 atmosphere. The XRD patterns revealed that the solid solution series of （Ba3 x-ySrx）Si6Ol2N2：yEu2＋ with x value ranging from 0-0.6 were established. An efficient and intense tunable green light was observed by varying the cation Sr/Ba ratio. The emission spectra exhibited an entire shift towards long wavelength with increasing ofx value, which was caused by large crystal field splitting and Stokes shift. The x value dependence of emission intensity was discovered and explained by the enhanced probability of electron from excited 4f state to 5d ground state via nonradioactive transition. Highly thermal stability and feasible color coordinates were verified. White LEDs with excellent photochromic properties were fabricated by packing GaN based blue chips and （Ba Sr）3Si6012N2：Eu2＋ phosphors. All results indicated that the （Ba3_xSrx）SirO12N2：Eu2＋ phosphors were confirmed to be a promising candidate for pc-white LEDs in solid state lighting.

关键词： oxynitride phosphor solid solution white LEDs rare earths

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Effect of fluxes on synthesis and luminescence properties of BaSi_2O_2N_2:Eu^(2+) oxynitride phosphors

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Journal of Rare Earths 2018年第3期36卷 225-230页

作者： Jiansheng Huang Ronghui Liu Yuanhong Liu Yunshen Hu guantong chen Chunpei Yan Junhang Tian Bin Hu National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

Eu^2＋ activated BaSi2 O2 N2 oxynitride bluish-green phosphor was synthesized adopting conventional high-temperature solid-state reaction method, in which BaF2, Na2 CO3 and NH4 Cl were used as the *** phase formation, size distribution and microscopic morphology were characterized to investigate the influence of adding fluxes on photo luminescence properties. The results indicate that with the addition of BaF2 flux, the particle morphology becomes regular and size distribution narrows and the phase purity of BaSi2 O2 N2：Eu^2＋ phosphor can be improved effectively. The photoluminescence intensity of BaSi2 O2 N2：Eu^2＋ phosphor with BaF2 as flux gets enhanced obviously, which is much higher than that of Na2 CO3, NH4 Cl and without flux. The optimum content of BaF2 flux is 4 wt%, and the maximum photoluminescence intensity of the BaSi2 O2 N2：Eu^2＋ phosphor prepared with BaF2 flux rises to 141%,meanwhile, the phosphors with BaF2 flux exhibits low thermal quenching. The results indicate that the BaSi2 O2 N2：Eu^2＋ is sort of promising bluish-green phosphor for application in full-spectra LED.

关键词： BaSi2O2N2 Oxynitride phosphor Flux Thermal stability Rare earths

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Luminescent properties of Ce^(3+),Er^(3+) co-doped La_3Si_6N_(11)

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Journal of Rare Earths 2019年第3期37卷 248-252页

作者： Yuan Xue Ronghui Liu Yuanhong Liu Huibing Xu guantong chen Xia Zhang Wei Gao Ze Jiang National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

In order to obtain near-infrared phosphor pumped by blue chip with high luminous efficiency, a novel near-infrared phosphor Ce^(3+)/Er^(3+) doped La_3Si_6N_(11) was designed and firstly prepared via conventional solid-state reactions. The structure and morphology of Ce^(3+)/Er^(3+) doped La_3Si_6N_(11) were investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Compared with Er^(3+) doped La_3Si_6N_(11),the emission intensity of the Ce^(3+), Er^(3+) co-doped phosphor can be increased more than 5 ***, the mechanism of energy transfer from Ce^(3+) to Er^(3+) is confirmed according to the excitation,emission spectra and decay lifetimes curve. Above results suggest that La_3 Si_6 N_(11):Ce^(3+),Er^(3+) is a promising near-infrared phosphor for blue pumped LEDs(light-emitting diodes).

关键词： Solid state reaction Energy transfer Near-infrared phosphor La3Si6N11:Ce3+ Er3+ Rare earths

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White-light emitting single-phase phosphor La_3Si_6N_(11):Dy^(3+),Tb^(3+):Color tunable emission, thermal stability and energy transfer process

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Journal of Rare Earths 2019年第4期37卷 350-355页

作者： Yuanhong Liu Yuan Xue Ronghui Liu Mingyue chen guantong chen Chunpei Yan Xia Zhang Yu'nan Zhou Wei Gao Xiaole Ma National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co.Ltd.

A novel white-light emitting single-phase phosphor La_3 Si_6 N_(11):Dy^(3+),exhibiting two emission peaks centering at 475 and 575 nm, was prepared via conventional solid-state reactions. The structure and morphology of La_3 Si_6 N_(11):Dy^(3+)/Tb^(3+) were investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The emission colors can be tuned from white to yellow-green through increasing the Tb^(3+) concentration in La_3 Si_6 N_(11):Dy^(3+),Tb^(3+), The mechanism of energy transfer(ET) from Dy^(3+) to Tb^(3+) is confirmed according to the excitation,emission spectra and decay lifetimes curve. The temperaturedependent luminescence measurements of La_(2.83)Si_6 N_(11):0.1 Dy^(3+),0.07 Tb^(3+) were also performed, and a good thermal stability is shown, suggesting superior properties for the application as white lightemitting diodes(w-LEDs) phosphor.

关键词： Single-phase White emission Energy transfer Rare earths

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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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Interactive Media Engineering Talents Training Model of Studio System from the Perspective of University-enterprise Collaboration

Interactive Media Engineering Talents Training Model of Stud...

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作者： Yidi Li Mingbao Zhang Qingjun Yu Xiang Li guantong chen Dalian Neusoft University of Information

The introduction and training of talents are the most important invisible resources and the weapon to win in today's enterprises. The output of suitable talents has become the focus of attention in colleges and universities. Therefore, how to effectively link the needs of talents in enterprises with the training of talents in universities in teaching has become the research topic of the project. Based on the premise of joint training of universities and enterprises, this paper explores the output of studio-based interactive media application-oriented personnel training. The talent training mode of studio system is an educational system that integrates professional education with enterprise education. Focusing on the effectiveness, particularity and innovation of the interactive media talent training mode, this paper studies the interactive media talent training mode from the perspective of practical knowledge, explores the connotation of the interactive media talent training mode, so as to find a more reasonable path of teaching reform, and provide a real explanatory theory for the educational practice of the interactive media talent training mode in higher education.

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Synthesis and photoluminescence properties of octahedral K_2(Ge,Si)F_6:Mn^(4+) red phosphor for white LED

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Journal of Rare Earths 2016年第12期34卷 1173-1178页

作者：金玉明刘荣辉陈观通刘元红马小乐邵冷冷王磊 National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co.Ltd.

A novel red-emitting K2（Ge,Si）F6：Mn^4＋ phosphor with uniform morphology was synthesized by co-precipitation method. The pure K2GeF6 phase with P63 mc space group other than P3m1 space group was affirmed just by incorporation of Si in K2GeF6 at room temperature according to XRD characterization. SEM images showed lamellar and octahedron grain morphology for K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ phosphors, respectively. It was also found that the photoluminescence excitation（PLE） and photoluminescence（PL） showed slight displacement in K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ system. And the zero-phonon line（ZPL） of the PL spectrum of K2GeF6：Mn^4＋ with Si showed a strong peak. Meanwhile crystalline field surrounding Mn^4＋ changes could affect the decay time in this fluoride system. The color gamut of the LED devices based on K2（Ge,Si）F6：Mn^4＋ and K2GeF6：Mn^4＋ reached up to 94.58% NTSC（National Television Standards Committee） and 94.386% NTSC, respectively, that was much higher than that based on nitride red phosphors. All these original characteristics in K2（Ge,Si）F6：Mn^4＋ phosphor are desirable for potential applications as a red phosphor for improving lighting and display quality of conventional white LEDs.

关键词： K2(Ge Si)F6:Mn4+ fluoride PLE and PL decay time phosphors rare earths

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High temperature stability of Eu^(2+)-activated nitride red phosphors

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Journal of Rare Earths 2014年第1期32卷 12-16页

作者：胡运生庄卫东何华强刘荣辉陈观通刘元红黄小卫 National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co. Ltd.

The novel nitride-based luminescent materials have received much attention since the end of the last century. In this paper, the commercial Eu2＋-activated nitride red phosphors, Sr1.95Si5N8：Eu0.05, Sr1.85Si5N8：Eu0.15 and Ca0.99AlSiN3：Eu0.01 phosphors were an-nealed at different temperatures （beyond 300 oC） to investigate the dependence of their luminescence performance and structure vari-ability on the temperature. By photoluminescence spectra, X-ray diffraction （XRD） and thermogravimetry-differential scanning calo-rimetry （TG-DSC） analysis, the high temperature stability of the hosts and activator of the three samples were disclosed. With the an-nealing temperature increasing, the activator Eu2＋ions were firstly oxidized and then host in Sr1.95Si5N8：Eu0.05 and Sr1.85Si5N8：Eu0.15, but for Ca0.99AlSiN3：Eu0.01, only the oxidation of the host could be observed, which would lead to the luminescence degradation and even failure of these phosphors. The activator Eu2＋ions were much more stable in CaAlSiN3：Eu than Sr2Si5N8：Eu due to their crystal surroundings, and its concentration also influenced the temperature stability of Sr2Si5N8：Eu.

关键词： nitride red phosphor high temperature stability oxidation rare earths

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稀土光功能材料发展现状及趋势

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中国稀土学报 2021年第3期39卷 338-349页

作者：刘荣辉刘元红陈观通余金秋高彤宇田俊行王恒有研科技集团有限公司稀土材料国家工程研究中心有研稀土新材料股份有限公司北京100088

稀土光功能材料作为照明、显示和信息探测等领域的支撑材料之一,已在室内照明、液晶显示、核医学成像、辐射探测、激光工业和国防安全等领域得到广泛应用。介绍了中国稀土光功能材料的技术和产业发展现状,指出了绿色照明、高品质显示和... 详细信息

稀土光功能材料作为照明、显示和信息探测等领域的支撑材料之一,已在室内照明、液晶显示、核医学成像、辐射探测、激光工业和国防安全等领域得到广泛应用。介绍了中国稀土光功能材料的技术和产业发展现状,指出了绿色照明、高品质显示和高敏信息探测等应用新趋势,重点分析了超高色域显示和全光谱健康照明荧光粉、稀土激光和闪烁晶体等稀土光功能材料发展新动态,提出了稀土光功能材料未来发展建议。

关键词：稀土光功能材料白光LED 超高色域显示全光谱照明晶体材料

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