CAJ | 학술논문

采用传统熔体冷却技术制备Ce~(3+)和Tb~(3+)掺杂的BaO-La_2O~3-B_2O_3-SiO_2玻璃,并测试样品的吸收光谱和荧光光谱.实验结果表明:由于Ce~(3+)在5d-4f轨道之间的电子跃迁,基础玻璃掺Ce~(3+)后吸收截止边明显红移;掺Ce~(3+)的BaO-La_2O_3-B_2O_3-SiO_2玻璃的荧光发射光谱为峰值位于410 nm附近的宽带,对应于Ce~(3+)的5d-4f跃迁;由于SiO~2比B_2O_3的光碱度大,玻璃的荧光发射波长,体现出随硼硅比的降低而略有红移;还原性气氛有利十提高玻璃中Ce~(3+)的含量,从而增强发光强度;对Ce~(3+)和Tb~(3+)共掺玻璃,Ce~(3+)和Tb~(3+)在波长200-311 nm间有激发带重叠,因存在竞争吸收,导致以此区间波长激发时Tb~(3+)的发光有所减弱;Ce~(3+)和Tb~(3+)在311-444 nm间也有激发带(或激发带与发射带)部分重叠,因Ce~(3+)和Tb~(3+)之间存在的辐射和无辐射能量传递导致Ce~(3+)强烈敏化Tb~(3+)的发光.
채용전통용체냉각기술제비Ce~(3+)화Tb~(3+)참잡적BaO-La_2O~3-B_2O_3-SiO_2파리,병측시양품적흡수광보화형광광보.실험결과표명:유우Ce~(3+)재5d-4f궤도지간적전자약천,기출파리참Ce~(3+)후흡수절지변명현홍이;참Ce~(3+)적BaO-La_2O_3-B_2O_3-SiO_2파리적형광발사광보위봉치위우410 nm부근적관대,대응우Ce~(3+)적5d-4f약천;유우SiO~2비B_2O_3적광감도대,파리적형광발사파장,체현출수붕규비적강저이략유홍이;환원성기분유리십제고파리중Ce~(3+)적함량,종이증강발광강도;대Ce~(3+)화Tb~(3+)공참파리,Ce~(3+)화Tb~(3+)재파장200-311 nm간유격발대중첩,인존재경쟁흡수,도치이차구간파장격발시Tb~(3+)적발광유소감약;Ce~(3+)화Tb~(3+)재311-444 nm간야유격발대(혹격발대여발사대)부분중첩,인Ce~(3+)화Tb~(3+)지간존재적복사화무복사능량전체도치Ce~(3+)강렬민화Tb~(3+)적발광.
Ce~(3+) and Tb~(3+) doped BaO-La_2O_3-B_2O_3-SiO_2 glasses were prepared by conventional melt quenching technology. Absorption spectrum and fluorescence spectrum of samples were investigated. Due to 5d-4f electronic transition, absorbent border of Ce~(3+) doped BaO-La_2O_3-B_2O_3-SiO_2glasses shifts toward longer wavelength. Photoluminescence spectra of Ce~(3+) doped BaO-La_2O_3-B_2O_3-SiO_2 glasses show an obvious broad band with peak value of about 410 nm, which ascribes to 5d-4f electronic transition of Ce~(3+) ion. Emission wavelength increases with the reduce of the ratio of boron and silicon reduced in glasses, which can be explained with optical basicity of SiO_2 and B_2O_3. Luminescent intensity of glasses can be enhanced as Ce~(3+) concentration increases in deoxidization atmosphere. For Ce~(3+) and Tb~(3+) co-doped glass, luminescent intensity of Tb~(3+) decreases, which can be related to the competitive absorption between Ce~(3+) and Tb~(3+) when excitation wavelength locates at 200-311 nm. However, the luminescent sensitization of Tb~(3+) by Ce~(3+) was observed on the wavelength of 311-444 nm, which is explained with the radiation energy transfer and non-radiation energy transfer from Ce~(3+) to Tb~(3+).