本論文以中溫水熱法合成出一系列 R2(C8H10O4)3配位聚合物，配位中心 是不同莫耳比例之稀土元素如釔(yttrium, Y)及鋱(terbium, Tb) (R = Y, Tb)，而配位基為 1,4-cyclohexanedicarboxylate (C8H10O4，簡稱 CHDC) ，將合成之配位聚合物以單晶及粉末 X 光繞射實驗鑑定其結構與純 度。實驗上以光致放光(photoluminescence)、激發(excitation)及時間解 析(time-resolved)光譜之光譜技術對所合成之樣品及前驅物 Tb(NO3)3進 行研究。結果發現含 Tb3+的化合物在以 561 nm 激發時均可觀測到藍位 移(blue shift)放光訊號，這些藍位移放光訊號皆為 Tb3+ 5D4激發態之放 光，但在配位化合物中的訊號遠比 Tb(NO3)3中的訊號強。我們以光功 率(power dependence)實驗及溫度相依(temperature dependence)實驗證實 藍位移放光訊號的產生在配位聚合物中為一個雙光子共振吸收(twophoton resonant absorption)過程，而在 Tb(NO3)3中則為一個單光子的熱 譜帶躍遷(hot band transition)過程。而這些藍位移訊號的強度則取決於 雙光子波長或單光子波長對應的吸收度大小。由 Tb3+的藍位移光譜研 究，我們也觀測到在含 Tb3+和 Eu3+的配位聚合物中 Tb3+ 5D4能量轉移 至 Eu3+ 5D1之新能量轉移路徑。;Coordination polymers, R2(C8H10O4)3, were synthesized using midtemperature hydrothermal method with rare earth elements such as Y3+ or Tb3+ as the coordination center and 1,4-cyclohexanedicarboxylate (C8H10O4, CHDC) as ligands. The structure and purity of these compounds were determined by single crystal and powder X-ray diffraction data. Photoluminescence, excitation, and time-resolved spectra of these compounds and the precursor, Tb(NO3)3, were acquired. The blue shift signals are observed in the emission spectra of these compounds at 561 nm excitation, while the blue shift emission of the coordination compounds is much stronger than that of Tb(NO3)3. Power dependence and temperature dependence measurements were conducted. The results indicate that the formation of blue shift emission in coordination polymers is a two-photon resonant absorption process while that is a one-photon hot band transition in Tb(NO3)3. The intensity of blue shift emission in these compounds depends on the absorption cross section at the corresponding two-photon or one-photon wavelengths. Based on the blue shift emission study of Tb3+ , in the coordination polymers containing both Tb3+ and Eu3+, the new energy migration path from Tb3+ 5D4 to Eu3+ 5D1 was also identified.
