稀土掺杂Gd_(2)Te_(4)O_(11)亚碲酸盐荧光粉的合成及其发光性能  

Synthesis and luminescent properties of rare earths doped Gd_(2)Te_(4)O_(11) tellurite phosphors

作　　者：罗杰[1] 张子秋[1] 徐俊豪 秦兆婷 赵元帅 何洪[1] 李冠男 唐剑锋[1] Luo Jie;Zhang Zi-Qiu;Xu Jun-Hao;Qin Zhao-Ting;Zhao Yuan-Shuai;He Hong;Li Guan-Nan;Tang Jian-Feng(School of Materials and Energy,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学材料与能源学院,重庆400715

出　　处：《物理学报》2023年第1期296-308,共13页Acta Physica Sinica

基　　金：重庆市自然科学基金面上项目(批准号:cstc2020jcyj-msxmX0142);重庆市留学归国人员创新项目(批准号:cx2020102)资助的课题。

摘　　要：采用水热法制备了一系列稀土Dy^(3+),Tb^(3+),Eu^(3+)掺杂的极性Gd_(2)Te_(4)O_(11)(GTO)亚碲酸盐荧光粉.对样品的物相结构、形貌和热稳定性等进行了表征,测试了样品的发光性能.结果显示,所制样品均为单相,呈短杆状形貌,尺寸在微米量级,热稳定性能良好.对于GTO:Dy^(3+)荧光粉,在紫外光激发下的发光主要位于黄绿光区,获得最强发光强度的掺杂浓度为2.5%,色坐标为(0.39,0.43);荧光衰减曲线表明GTO:Dy^(3+)样品发光寿命随着掺杂浓度增大逐渐减小,与Dy^(3+)离子间的交叉弛豫有关.对于GTO:Eu^(3+)荧光粉,在紫外光激发下的发光主要位于红光和橙红光区,其发射强度随着Eu^(3+)掺杂浓度的增大而增强.当掺杂浓度为10%时,样品发光的色坐标为(0.62,0.38),位于橙红光区,且样品的发光寿命几乎不受掺杂浓度影响.对于GTO:Tb^(3+)荧光粉,随着Tb^(3+)掺杂浓度的增大,受Tb^(3+)离子间交叉弛豫的影响,荧光粉在紫外光激发下的发射从蓝紫区向黄绿光区转变;其中,当Tb^(3+)浓度为0.5%时,样品表现为白光发射,色坐标为(0.33,0.35),显色指数达86.变温荧光光谱测试结果显示,上述荧光粉具有良好的发光热稳定性.对三类荧光粉的内量子效率进行了测试,其中GTO:Eu^(3+)量子效率优于GTO:Dy^(3+)和GTO:Tb^(3+),各样品量子效率仍有较大提升空间.A series of rare earth Dy^(3+),Tb^(3+),Eu^(3+)singly doped Gd_(2)Te_(4)O_(11)(GTO)tellurite phosphors with intrinsic polarity are prepared by hydrothermal method.The phase structures,morphologies and thermal stabilities of these phosphors are characterized.Their luminescence properties are tested in detail.The results show that all those phosphors are crystalized into single phase of digadolinium tellurite with short rod-like shape.The maximum size in the axial direction is microns.The phosphor has good thermal stability.For the GTO:Dy^(3+),the fluorescence emission under UV excitation is mainly located in the yellow-green region.The optimal doping concentration corresponding to the strongest excitation and emission is 2.5%,and the CIE color coordinates are(0.39,0.43).The fluorescence decay curve shows that the lifetime of the GTO:Dy^(3+)on ^(4)F_(9/2) energy level decreases gradually with doping concentration of Dy^(3+)increasing,which may be related to the cross relaxation(CR)between Dy^(3+)ions.For the GTO:Eu^(3+),the fluorescence emission under UV excitation is mainly located in the red region and orange-red region.The emission intensity is enhanced with the doping concentration of Eu^(3+)increasing.When the doping concentration is 10%,the CIE color coordinates are(0.62,0.38),which are located in the orange-red region with high color purity.The fluorescence lifetime of Eu^(3+)on ^(5)D_(0) energy level is hardly affected by the change of Eu^(3+)doping concentration.For the GTO:Tb^(3+),with the increase of the Tb^(3+)concentration,the fluorescence emission under UV excitation changes from blue-violet region to yellow-green region,which can be ascribed to the influence of CR between Tb^(3+)ions.The fluorescence decay behavior reveals that the Tb^(3+)ions on ^(5)D_(4) excited state may undergo energy transfer and reabsorption,which can deviate the fluorescence decay from the single exponential model.When the concentration of Tb^(3+)is 0.5%,the sample exhibits white light emission with the CIE color coordinates of

关 键 词：稀土亚碲酸盐 荧光粉 发光性能 热稳定性 

分 类 号：TQ422[化学工程] TN312.8[电子电信—物理电子学]