CAJ | 학술논문

采用 X 射线吸收近边结构(XANES)谱对多晶 Lu2 SiO5∶ Ce(LSO∶ Ce)发光粉体中 Ce 元素的化合价状态进行了表征,结果表明：在空气下煅烧后得到的不同 Ce 掺杂浓度的 LSO∶ Ce 粉体中,Ce3+在总掺杂 Ce 中的含量仅为18%~39%；而经1000℃/2 h 的氢气气氛下退火后,LSO∶0.5% Ce 粉体中 Ce3+的相对含量由39%大幅提高到83%。真空紫外(VUV)激发发射光谱表明：当 Ce 的掺杂摩尔分数为0.25%~1%时, Ce3+的摩尔分数与 LSO∶ Ce 粉体的发光强度具有很好的关联性。氢气退火处理可以使 LSO∶ Ce 粉体的发光强度提高近40%。 LSO∶ Ce 粉体在变温条件(50~250 K)下的发射强度表现出良好的稳定性,未观察到热猝灭现象发生。
채용 X 사선흡수근변결구(XANES)보대다정 Lu2 SiO5∶ Ce(LSO∶ Ce)발광분체중 Ce 원소적화합개상태진행료표정,결과표명：재공기하단소후득도적불동 Ce 참잡농도적 LSO∶ Ce 분체중,Ce3+재총참잡 Ce 중적함량부위18%~39%；이경1000℃/2 h 적경기기분하퇴화후,LSO∶0.5% Ce 분체중 Ce3+적상대함량유39%대폭제고도83%。진공자외(VUV)격발발사광보표명：당 Ce 적참잡마이분수위0.25%~1%시, Ce3+적마이분수여 LSO∶ Ce 분체적발광강도구유흔호적관련성。경기퇴화처리가이사 LSO∶ Ce 분체적발광강도제고근40%。 LSO∶ Ce 분체재변온조건(50~250 K)하적발사강도표현출량호적은정성,미관찰도열졸멸현상발생。
The valence state of Ce in the polycrystalline Lu2 SiO5 ∶ Ce(LSO∶ Ce) luminescent pow-ders was characterized by X-ray absorption near edge structure (XANES) spectra. The result dem-onstrates that Ce3 + contents relative to Ce in the LSO∶ Ce powders with different Ce-doped concentra-tion are only 18% ~ 39% . Annealed at 1 000 ℃ for 2 h in a flowing hydrogen atmosphere, the rela-tive Ce3 + content of LSO∶ 0. 5% Ce powder increases significantly to 83% from 39% . The emission spectra excited by vacuum ultra violet (VUV) suggest that the luminescence intensity of LSO∶ Ce with Ce mole fraction from 0. 25% to 1% is correlated closely with Ce3 + content in the powders. The luminescence intensity of LSO∶ 0. 5% Ce increases about 40% by annealing in a flowing hydro-gen atmosphere. The emission intensity is very stable at different temperatures (50 ~ 250 K) without thermal quenching effect observing.