Mn^(2+)掺杂对YAG∶Ce^(3+)荧光陶瓷发光性能的影响  

Comparative Study of Mn^(2+)on Luminescence Properties in YAG∶Ce^(3+)Phosphor Ceramics

作　　者：喻彬 孙炳恒 付秀梅 周世斌 郝好莹 沈方樑 范金太[2] 姜本学[2] 张龙[2] 孙军[1,4] YU Bin;SUN Bingheng;FU Xiumei;ZHOU Shibin;HAO Haoying;SHEN Fangliang;FAN Jintai;JIANG Benxue;ZHANG Long;SUN Jun(School of Physics,Nankai University,Tianjin 300071,China;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Chengdu Dongjun Laser Co.,Ltd.,Chengdu 611630,China;Xinjiang Technical Institute of Physics&Chemistry,Chinese Academy of Sciences,Urumqi 830000,China)

机构地区：[1]南开大学物理科学学院,天津300071 [2]中国科学院上海光学精密机械研究所,上海201800 [3]成都东骏激光股份有限公司,四川成都611630 [4]中国科学院新疆理化技术研究所,新疆乌鲁木齐830000

出　　处：《发光学报》2024年第5期762-771,共10页Chinese Journal of Luminescence

基　　金：国家重点研发计划(2021YFB3501700);国家资助博士后研究计划(GZC20232818);四川省重点研发计划项目(2020YFG0331)。

摘　　要：过渡族金属Mn^(2+)掺杂的石榴石荧光陶瓷被认为是实现高显色激光照明的候选材料。然而,由于Mn^(2+)在不同配位环境下离子半径的多样性,Mn^(2+)掺杂石榴石陶瓷体系设计方案尚不明确。本文采用真空烧结技术制备得到不同浓度Mn^(2+)掺杂的YAG∶Ce^(3+)荧光陶瓷,并将Mn^(2+)分别设计进入八面体(OC)和十二面体(DO)格位。通过表征样品物相和显微结构、光致发光、荧光寿命、量子效率等,并通过LD激光器激发对荧光陶瓷的发光性能进行研究。实验结果表明,在添加电荷与体积补偿剂SiO_(2)的前提下,相比Mn^(2+)进入十二面体格位,Mn^(2+)进入八面体后石榴石的晶体结构更加稳定。因此,当Mn^(2+)的浓度控制在0.5%^(6)%(at)范围内,OC系列样品的量子效率高于DO系列样品。此外,OC系列样品的PL谱中位于588 nm和725 nm处的发射峰分别对应于Mn^(2+)占据八面体和十二面体格位的^(4)T_(1)→^(6)A_(1)电子跃迁,而DO系列样品中位于572 nm处的发射峰则源于Mn^(2+)占据扭曲的十二面体格位产生的电子跃迁。得益于Ce^(3+)→Mn^(2+)间高效的能量传递,将浓度为6%(at)的Mn^(2+)设计进入YAG∶Ce^(3+)中八面体格位制得荧光陶瓷,封装得到的激光白光光源的显色指数为70.8,相对色温为5117 K。本文对于Mn^(2+)掺杂的石榴石发光材料的开发研究是有力补充,也为提升YAG∶Ce^(3+)荧光陶瓷光谱中的红光成分,进而提高医疗、显示等领域的激光光源的显色性能提供借鉴。Transition-metal Mn^(2+)ion doped garnet phosphor ceramics are promising for laser lighting with high color rendering.However,the scheme for Mn^(2+)doped garnet ceramics is still ambiguous due to the diversity of ionic radii of Mn^(2+)in different coordinate environment.In this study,two series of YAG∶Ce^(3+)phosphor ceramics with different Mn^(2+)concentrations occupying octahedral(OC)and dodecahedral(DO)lattice sites were fabricated by vacuum sintering.The crystal structure,photoluminescence,fluorescence decay curves,quantum efficiency and electro-luminescence properties were studied in detail.The garnet crystal structure with Mn^(2+)occupying in octahedral(OC)sites was more stable under the premise of doping SiO_(2) as charge and volume compensator.Therefore,the quantum efficiency of the OC series samples was higher than that of the DO series,in case the Mn^(2+)concentration fixed at 0.5%−6%(at).In addition,emission bands of OC series samples peaked at 588 nm and 725 nm,were corresponding to the ^(4)T_(1)→^(6)A_(1) transitions of Mn^(2+)located at octahedral,and dodecahedral sites,respectively.The emission peak at 572 nm in the DO series was assigned to the transition of Mn^(2+)occupying in distorted dodecahedral sites.Benefiting from the efficient energy transfer from Ce^(3+)to Mn^(2+),the CRI and CCT of 70.8 and 5117 K,respectively,were acquired from the white LD lighting device structured by YAG∶Ce^(3+)phosphor ceramics with 6%(at)Mn^(2+)occupying in octahedral site.This study presents a strong supplement to the research on Mn-doped garnet luminescent materials,and provides a reference for improving the color rendering performance of laser lighting sources by adding the red spectral component of YAG∶Ce^(3+)phosphor ceramics,further driving their application in the field of medical treatment and display.

关 键 词：荧光陶瓷 Ce^(3+)掺杂 Mn^(2+)掺杂 格位 

分 类 号：O482.31[理学—固体物理]