Tb3＋掺杂高Lu-Gd氟氧化物玻璃的制备及其光谱性能

Preparation and luminescence of Tb3+-doped high lutetium-gadolinium oxyf luoride glasses

摘要:

通过高温熔融法制备了10组Tb3＋掺杂高 Lu-Gd氟氧化物玻璃样品,测试了样品的密度、透射光谱、激发光 谱、紫外激发发射光谱、X射线激发发射光谱和Tb³⁺、Gd³⁺的荧光寿命。着重 研究了Gd₂O₃和Lu₂O₃对Tb³⁺发光的影响,Tb³⁺的浓度猝灭效应以及Gd³⁺与Tb³⁺的能量 传递。结果表明,样品的密度 很高,部分样品密度已经超过6g/cm³；Tb³⁺的浓度猝灭效 应使得350～450nm范围内的荧光强度下降, 但是使得480～650nm范围内的发光强度增强；Lu₂O₃对Tb3+ 的紫外激发荧光强度几乎没有影响,但是 对X射线激发的发光强度有较大的影响；Gd₂O₃对Tb³⁺的发光具有促进作用, 两者 之间存在着能量传递,并通过Dexter理论验证了Gd³⁺与Tb³⁺间的能量传递是无 辐射能量传递。

Abstract:

A kind of Tb³⁺-doped high lutetium-gadolinium (Lu-Gd) concentration oxy fluoride glass was prepared by high temperature melting method.The den sity,transmission,emission,excitation spectra and scintillating properties of te n glass samples were measured and investigated.These results show that all the glass samples have a high density up to 5g/cm³,and especially the sample 5,the density is up to 6.2g/cm³;with t he increase of the concentration of Tb³⁺ ions,the intensity in emission range of 350－450nm will be decreased,while that in the emission range of 480－650nm will be increa sed;the intensity of emission under UV excitation does not change along with the Lu₂O_{3concentration} increasing,while that und er X-ray excitation increases with the Lu₂O_{3concentration} increasin g.Also we observed that Gd₂O_3has a positive impact on the emission of Tb³⁺ ion,and the e nergy transfer between Gd³⁺ and Tb³⁺ ions exists,which is verified t o be no radiation energy transfer by using Dexter theory.