含三價釤配位聚合物藍位移訊號及相關能量轉移之研究

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题名:	含三價釤配位聚合物藍位移訊號及相關能量轉移之研究
作者:	黃致瑄;Huang, Chih-Hsuan
贡献者:	化學學系
关键词:	藍位移訊號;藍位移光譜;含三價釤配位聚合物;能量轉移;Blue-shift signal;Blue-shift emission;Coordination polymers containing trivalent samarium;Energy transfer
日期:	2021-07-29
上传时间:	2021-12-07 11:20:46 (UTC+8)
出版者:	國立中央大學
摘要:	本論文主要研究含三價釤之配位聚合物中藍位移(blue shift)光譜訊號之形成機制與相關之能量轉移現象。這類配位聚合物以三價釤(Sm3+)、鋱(Tb3+)、釔(Y3+)為配位中心，1,4-cyclohexanedicarboxylate (C8H10O4，簡稱CHDC)為配位基，利用中溫水熱法合成配位聚合物。先前研究中發現以560 nm光源激發含Sm3+配位聚合物放光光譜中有530 nm之藍位移訊號，本論文以激發光譜(excitation spectra)、光致放光光譜(photoluminescence spectra)、時間解析光譜(time-resolved spectra)、光功率依賴性(power dependence)等實驗對此訊號進行研究。在此類配位聚合物中，530 nm訊號主要來自於單光子熱譜帶躍遷(hot band transition)至Sm3+ 4F3/2而放光，且配位基會轉移能量給Sm3+之4F3/2。在不同Sm3+濃度之配位聚合物中，其530 nm訊號放光衰退生命期有明顯差異，原因可能是在配位聚合物中存在兩種交互遲緩(cross relaxation)機制。而含Sm3+與Tb3+的配位聚合物中，更有Tb3+→Sm3+的能量轉移到Sm3+ 4F3/2 激發態。此外，對比含Y3+的配位聚合物，我們發現可能有少部分的Sm3+透過Tb3+傳遞能量轉移到遠端的Sm3+。;This thesis investigates the blue shift signal in the emission spectra of coordination polymers containing trivalent samarium (Sm3+). These coordination polymers were synthesized using mid-temperature hydrothermal technique and have trivalent samarium (Sm3+), terbium (Tb3+), or yttrium (Y3+) as the coordination center and 1,4-cyclohexanedicarboxylate (C8H10O4，CHDC) as ligands. Previous study observed a blue shift signal at 530 nm in the emission spectra of coordination polymers containing Sm3+ at 560 nm excitation. This work acquires excitation spectra, photoluminescence spectra, time-resolved spectra, and power dependence measurements of these compounds. In these coordination polymers, the 530 nm blue shift signal results from one-photon hot band transition to the Sm3+ 4F3/2 highly excited state, and the energy transfer from the ligands to Sm3+ 4F3/2 was observed. The coordination polymers with different Sm3+ concentration exhibit different emission lifetimes of the 530 nm signal since there are two cross relaxation mechanisms in these compounds. In the coordination polymers containing Sm3+ and Tb3+, the energy transfer from Tb3+ to Sm3+ 4F3/2 was found. In addition, in comparison with the coordination polymers containing Y3+, we discover a portion of the Sm3+ 4F3/2 state energy could transfer to the non-adjacent Sm3+ via Tb3+.
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