CAJ | 학술논문

Tb3+ 掺杂SrO-TiO2-SiO2 玻璃在 800nm 的飞秒激光照射下可以观察到红外至可见的上转换现象.由飞秒激光激发的上转换荧光光谱与 267 nm 氙灯激发的荧光光谱非常相似.其上转换荧光可归因于Tb3+的5D3→7F4和5D4→7FJ(J=6,5,4,3)能级跃迁.由发光强度和泵浦光源能量之间的关系可以得出此上转换过程为三光子同时吸收过程.基态电子同时吸收三个红外光子被激发到较高激发态,然后以非辐射跃迁方式弛豫到较低激发态,再辐射跃迁到基态从而产生 Tb3+ 的特征发光峰.这现象可应用于三维立体显示,可见激光和高密度光存储技术.
Tb3+ 참잡SrO-TiO2-SiO2 파리재 800nm 적비초격광조사하가이관찰도홍외지가견적상전환현상.유비초격광격발적상전환형광광보여 267 nm 선등격발적형광광보비상상사.기상전환형광가귀인우Tb3+적5D3→7F4화5D4→7FJ(J=6,5,4,3)능급약천.유발광강도화빙포광원능량지간적관계가이득출차상전환과정위삼광자동시흡수과정.기태전자동시흡수삼개홍외광자피격발도교고격발태,연후이비복사약천방식이예도교저격발태,재복사약천도기태종이산생 Tb3+ 적특정발광봉.저현상가응용우삼유입체현시,가견격광화고밀도광존저기술.
We report on near infrared to visible upconversion luminescence in Tb3+-doped SrO-TiO2-SiO2 glass excited at 800nm by using femtosecond laser irradiation. The luminescence spectra of the glass are similar for femtoseeond laser irradiation and excitation at 267nm with a Xe lamp. The upconversion lumi-nescence can be assigned to 5D3→7F4 and 5D4→7FJ(J=6, 5, 4, 3) transitions of Tb3+. The relationship between the emission intensity of Tb3+ and the pump power indicates that a three-photon simultaneous ab-sorption process is dominant in the conversion of infrared to the green luminescence. We suggest that the simultaneous absorption of three infrared photons promotes the Tb3+ to excited states, which quickly cas-cade down to lower excited states, and radiatively relax to terminal states, resulting in the characteristic fluorescence of Tb3+. This has promising applications in three dimensional display, visible lasers and high-resolution optical data storage.