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高光效高热稳定性蓝色荧光粉Ca2-ySrySiO4∶Ce3+,Li+的组成筛选和发光机理 被引量:5

Composition-Screening and Luminescent Mechanism in CaSrSiO∶Ce,Li for High Quantum Efficiency and Thermally Stable Blue-Emitting Phosphor
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摘要 采用高温固相法合成了一系列Ca2-x-ySry-xSiO4∶x Ce^3+,x Li^+蓝色固溶体荧光粉。XRD结果表明,所合成的固溶体荧光粉均为单一物相。随着Sr2+成分的增加,Ca2-ySry SiO4物相从单斜晶系β-Ca2SiO4向正交晶系α′-Ca2SiO4转变,发射光谱逐渐红移。组成为Ca1.75Sr0.25SiO4时,荧光粉的发射波长最长(454 nm),Stokes位移最大。基质为Ca1.1Sr0.9SiO4的晶体结构可诱导掺杂离子Ce^3+取代SrO10格位、Li^+取代CaO8格位。优化的荧光粉Ca1.05Sr0.85SiO4∶0.05Ce^3+,0.05Li^+(CS0.85SO∶CeLi)在375 nm紫外光激发下,发射445 nm的蓝光,内量子效率(IQE)达到91.18%,200℃时发射强度保持室温发光强度的98.70%。根据晶体结构、晶体场分裂和掺杂离子质心位移等理论,讨论了CS0.85SO∶CeLi综合发光效应最佳的内在原因。 Ca2-x-ySry-xSiO4∶x Ce^3+,x Li^+solid solution phosphors were designed and prepared by a high temperature solid-state reaction in a reductive atmosphere.The results of the XRD reveal that as-synthesized samples are single-phase compounds,and a phase transition from monoclinicβ-Ca2SiO4 to orthogonalα′-Ca2SiO4 exists(y=0~0.25).The excitation and emission spectra of the phosphors showed a gradual redshift with the increase of Sr content(y)from 0 to 0.25,which showed the largest Stokes shift(73 nm)for Ca1.75Sr0.25SiO4,and subsequently a blueshift showed up after a further increase of y value.Moreover,the host of Ca1.1Sr0.9SiO4 can induce Ce^3+ions preferentially to occupy the ten-coordinated Sr2+sites(SrO10)while Li^+ions replace the eight-coordinated Ca2+sites(CaO8).The optimized phosphor Ca1.05Sr0.85SiO4∶0.05 Ce^3+,0.05 Li^+(CS0.85SO∶Ce)possessed a high internal quantum efficiency(IQE)reached 91.18%.The temperature-dependent photoluminescence(PL)spectra showed that the PL intensity of CS0.85SO∶Ce at 200℃maintained 98.70%of that at room temperature.The luminescent mechanisms were discussed in detailed according to crystal structure,crystal field theory and the Dorenbos model.
作者 征雪 陈悦 贾英华 陈轩锋 穆哲 王小芳 马驰 周文理 廉世勋 ZHENG Xue;CHEN Yue;JIA Ying-Hua;CHEN Xuan-Feng;MU Zhe;WANG Xiao-Fang;MA Chi;ZHOU Wen-Li;LIAN Shi-Xun(Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education),Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province College,College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China)
出处 《无机化学学报》 SCIE CAS CSCD 北大核心 2020年第9期1659-1668,共10页 Chinese Journal of Inorganic Chemistry
基金 国家重点研发计划项目(No.2016YFB0302403) 国家自然科学基金(No.21571059) 国家大学生创新创业训练计划(No.201710542004) 湖南省研究生创新项目(No.CX20190340)资助。
关键词 固溶体 Ca1.1Sr0.9SiO4∶Ce^3+ 蓝色荧光粉 量子效率 热稳定性 solid solution Ca1.1Sr0.9SiO4:Ce^3+ blue phosphor quantum efficiency thermal stability
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