Ce^(3+)–Eu^(3+)共掺Y_(3)Al_(5)O_(12)透明陶瓷荧光性能  

Fluorescence Properties of Ce^(3+)/Eu^(3+)Co-doped Y_(3)Al_(5)O_(12)Transparent Ceramics

作　　者：肖煌盛 林雨晴 邓志强 杨玉娟 陈剑[1] 邓种华[1] 黄集权[1] 郭旺[1,3] XIAO Huangsheng;LIN Yuqing;DENG Zhiqiang;YANG Yujuan;CHEN Jian;DENG Zhonghua;HUANGJiquan;GUOWang(Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;College of Chemistry and Materials,Fujian Normal University,Fuzhou 350007,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China;School of Chemistry,Fuzhou University,Fuzhou 350002,China;School of Materials Science and Photovoltaic Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院福建物质结构研究所,光电材料化学与物理重点实验室,福州350002 [2]福建师范大学化学与材料学院,福州350007 [3]福建省光电信息科技创新实验室,福州350108 [4]福州大学化学学院,福州350002 [5]中国科学院大学材料科学与光电技术学院,北京100049

出　　处：《硅酸盐学报》2024年第3期783-793,共11页Journal of The Chinese Ceramic Society

基　　金：闽都创新实验室自主部署项目(2021ZZ113);福建省引导性科技计划项目(2023H0044)。

摘　　要：Y3Al5O12:Ce^(3+)(YAG:Ce^(3+))发射谱中红光成分的不足导致了白光LED色温偏高且显色性较差,一种解决方案是引入能发射红光的激活离子与Ce^(3+)共掺杂以使YAG:Ce^(3+)发射谱红移。本工作报道了Ce^(3+)–Eu^(3+)共掺Y_(3)Al_(5)O_(12)(YAG:Ce^(3+)/Eu^(3+))透明陶瓷的制备、结构和荧光性能。该材料体系在Eu含量高达25%时仍保持纯石榴石相结构,且Eu^(3+)的荧光猝灭浓度高达9%左右,比Pr^(3+)和Sm^(3+)等离子更适合用作YAG的红光发射激活剂。YAG:Ce^(3+)/Eu^(3+)透明陶瓷在蓝光(如442和466 nm)激发下的Ce^(3+)荧光发射随着Eu含量的增加而急剧下降,但在紫外光(363 nm)激发下Ce^(3+)的荧光衰减在一定程度上可被Eu^(3+)发射的增强所弥补,从而可以在保持较强荧光发射的同时使YAG:Ce^(3+)的发射光谱逐步红移到橙红光区。YAG:Ce^(3+)/Eu^(3+)透明陶瓷能够强烈吸收380~405 nm的近紫外光并将之高效转化为红光,且荧光光谱热稳定性优异,适合用作近紫外LED芯片激发的红光发射荧光材料。同时,荧光发射强度及发射谱中的不同发射峰的强度比值均随温度线性变化,在荧光温度计领域具有潜在的应用前景。Introduction Tremendous efforts are devoted to improving the luminous performance of white light-emitting diodes(WLEDs)as so-called fourth generation lighting source.The most common approach for manufacturing WLEDs is to cover a blue LED chip with a yellow-emitting Y_(3)Al_(5)O_(12):Ce^(3+)(YAG:Ce^(3+))phosphor.This construction has an advantage of high lumen efficiency,but an insufficient red light component in the spectrum leads to a low color rendering index and a high color temperature.An effective solution is to enhance the red emssion of YAG:Ce^(3+)via introducing red-emiting ions such as Pr^(3+),Eu^(3+),Sm^(3+),Mn^(2+),Mn^(4+)and Cr^(3+).In Y_(3)Al_(5)O_(12) and many other garnet-structured aluminates,Mn^(2+),Mn^(4+)and Cr^(3+) are suffered from serious luminescent thermal quenching,while Pr^(3+) and Sm^(3+) are severely limited by concentration quenching.In comparion,the luminescence of Eu^(3+)in YAG is highly anticipated because it has an ion radius similar to Y^(3+),which is beneficial to increasing doping concentration and reducing luminescence quenching.In this paper,a series of Ce^(3+)-Eu^(3+)co-doped YAG transparent ceramics with different Eu concentrations were fabricated,and the effect of Eu^(3+)-doping on the structure,optical transmittance and photoluminescence properties was also evaluated.Methods Ce_(0.01)Y_(2.99-x)Eu_(x)Al_(5)O_(12)(0<x<0.75,Eu contents of 0-25%)fluorescent ceramics were synthesized in vacuum via high-temperature solid-state reaction.High purity Y2Os,α-Al_(2)O_(3),Eu_(2)O_(3),and CeO_(2) powders were used as starting materials.Oleic acid and tetraethoxysilane were used as a molding agent and a sintering aid,respectively.These materials were weighed in stoichiometric ratios,and ground in ethanol for 20 h.The obtained slurry was dried,ground and sieved through a 100 mesh sieve.The resulting powders were made into 20 mm discs under uniaxial pressure of 5-10 MPa,annealed in oxygen atmosphere at 800℃ for 10 h,and cold isostatically pressed under 200 MPa.Finally,the ceramics was

关 键 词：铈铕共掺钇铝石榴石透明陶瓷 荧光性能 热猝灭 

分 类 号：O611[理学—无机化学]