Dy3+激活的几种硼酸盐在VUV-VIS范围的光谱性质

本文报道了SrAl2B2o7:Dy^3 、BaAl2B2O7:Dy^3 、SrAl3BO7:Dy^3 、La2CaB10O19:Dy^3 的紫外－真空紫外（UV－VUV）激发光谱和UV激发下的发射光谱。根据发射光谱讨论了Dy^3 离子在这几种基质中发光的黄蓝比（Y／B）。在VUV激发光谱中推测了Dy^3 的f-d跃迁及电荷迁移态（CTS）和基质吸收的位置。     

Study on Spectra of La_2CaB_(10)O_(19)∶Eu~(3 ) in VUV-VIS Range

Manyboratesareexcellenthostsforrareearthlu minescence ,forexample ,nowbestredphosphorinplasmadisplaypanel (PDP )is (Y1-xGdx)BO3∶Eu[1] .Boratephosphorsdopedwithrareearthionshavebeenrichlystudiedinthepastfewdecades[2 ,3] .RecentlyWuYichengetal .[4 ] synthesizedanewbo rateLa2 CaB10 O19,whichispotentialnonlinearopticalmaterials.InthisworkweselectedLa2 CaB10 O19ashostofluminescencematerialsbecauseitprobablyisabetterhostforrareearthluminescence .Duetotherequirementofplasmadisplaypenal(PDP)…     

Study on Spectra of La2CaB10O19∶Eu3+ in VUV-VIS Range

Excitation and emission spectra of new borate La2CaB10O19 doped Eu3 in VUV-VIS range, high resolution emission spectra at room temperature and lifetime of Eu3 were investigated. The emission line at about 616 nm attributed to the 5D0-7F2 transition of Eu3 is the most intense emission of Eu3 . The broad band at about 244 nm is originated from charge transition band (CTB) of O2-→Eu3 . According to the numbers of spectral lines 5D0-7F0 and 5D0-7F1 in high-resolution spectrum, Eu3 ions occupy two crystallographic sites. The lifetimes of 5D0-7F0 transition of Eu3 of two kinds of lattice sites are individually 2.1 and 2.6 ms, and both are exponential decay. In the VUV excitation spectrum, complicated band between 130 and 170 nm consists of host absorption and f-d transition of Eu3 .     

空气条件下合成的CaBPO5:Eu、SrB4O7:Eu和Ba3(PO4)2:Eu的XANES和发光性质

测定了采用高温固相反应在空气条件下合成的发光体CaBPO5：Eu、SrB4O7：Eu和Ba3(PO4）2：Eu的Eu-L3边的X射线吸收近边结构(XANES)谱和发光光谱。从发光体的Eu—L3边XANES可见，Eu^3 -L3边能量比Eu^2 -L3边能量高7—8eV；3个发光体的激发光谱和发射光谱均可看到Eu^2 的4f-5d跃迁和Eu^3 的4f-4f跃迁。发光体的Eu—L3边的XANES和发光光谱说明空气条件下合成的发光体中Eu^3 可部分还原为Eu^2 。     

Study on Spectra of La2CaB10O19：Eu^3＋ in VUV-VIS Range

Excitation and emission spectra of new borate La2CaB10O19 doped Eu^3 in VUV-VIS range, high resolution emission spectra at room temperature and lifetime of Eu^3 were investigated. The emission line at about 616nm attributed to the ^5D0-^7F2 transition of Eu^3 is the most intense emission of Eu^3 . The broad band at about 244nm is originated from charge transition band (CTB) of O^2→Eu^3 . According to the numbers of spectral lines ^5D0-^7F0 and ^5D0-7F1 in highresolution spectrum, Eu^3 ions occupy two crystallographic sites. The lifetimes of ^5D0-^7F0 transition of Eu^3 of two kinds of lattice sites are individually 2.1 and 2.6ms, and both are exponential decay. In the VUV excitation spectrum, complicated band between 130 and 170nm consists of host absorption and f-d transition of Eu^3 .