含三價釤硝酸鹽及氧化物高激發態放光行為之研究

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题名:	含三價釤硝酸鹽及氧化物高激發態放光行為之研究
作者:	高詣涵;Kao, Yi-Han
贡献者:	化學學系
关键词:	光譜學;三價釤;藍位移訊號;光致放光光譜
日期:	2021-07-28
上传时间:	2021-12-07 11:20:12 (UTC+8)
出版者:	國立中央大學
摘要:	本論文利用光致放光光譜(photoluminescence)、激發光譜(excitation)及時間解析(time-resolved)光譜對含三價釤(Sm3+)之氧化物(Sm2O3)及硝酸鹽水合物(Sm(NO3)3．6H2O)之激發態放光行為進行探討。以561 nm光源激發時於Sm(NO3)3．6H2O中觀測到在533 nm的藍位移(blue shift)訊號，此藍位移訊號主要來自Sm3+本身能階4F3/2，也可能包含部分更高能階4G7/2的放光，透過光功率依賴(power dependence)及溫度相依(temperature dependence)實驗得知藍位移訊號產生機制為一單光子熱譜帶躍遷(one-photon hot band transition)。比較與Sm3+大小相近、能階相似的Eu3+之同類型化合物，發現它們具有類似的高激發態放光行為，在硝酸鹽水合物都有放光生命期相近且具有較強的放光，但氧化物則沒有或僅有微弱的放光強度。此外，在這兩類含Eu3+或Sm3+的化合物中還觀測到兩種交互遲緩(cross relaxation)機制，一為存在於氧化物中配位中心間的交互遲緩，另一為在硝酸鹽水合物中高激發態與結晶水的振動偶合，加快其緩解至第一激發態的過程。而Eu3+或Sm3+的化合物之交互遲緩機制效率差異，導致高激發態具有不同的放射行為及緩解至下能階的速率。 ;Photoluminescence, excitation, and time-resolved spectra were recorded for studying the highly excited state emission behaviors of the oxide (Sm2O3) and nitrate (Sm(NO3)3·6H2O) containing trivalent samarium (Sm3+). A blue-shift emission was observed at 533 nm of the emission spectrum of Sm(NO3)3·6H2O at 561 nm excitation. Based upon the power dependence and temperature dependence measurements, this blue-shift emission originated from the 4F3/2 state or the higher 4G7/2 state and resulted from a one-photon hot band transition. Since Sm3+ and Eu3+ have similar energy levels and atomic radii, their corresponding compounds have similar highly excited state emission behaviors. Their nitrates have strong highly excited state emission with similar emission lifetimes, but their oxides have weak or no highly excited state emission. In these compounds, in addition to the cross relaxation between coordination centers, we found the energy relaxation from the highly excited state could couple with the crystalline water vibration. Due to the much stronger vibrational coupling, the energy relaxation from the highly excited state in Sm3+ has been much faster than that in Eu3+.
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