- 學位論文
以水熱及溶劑熱法合成鈦酸鍶系紅光螢光體探討其陰極發光特性
The study of cathodoluminescence on strontium titanate phosphor synthesized by hydrothermal and solvothermal method
摘要
本研究利用水熱法及溶劑熱合成法製備鈦酸鍶系紅光螢光體，由溶劑熱合成法製備出的粉末，置於1000 ℃/1h 煆燒下獲得的產物，再藉由XRD、SEM、ICP、ESCA、CL等檢測儀器，證明合成出的鈦酸鍶系螢光體為一高效率的紅光螢光體，其產物顆粒微小平均小於200 nm、顆粒分佈均勻、化學組成一致，紅光發光效率高於商用的氧化釔系(Y2O3:Eu)紅光螢光體。 本論文的主要目地是要指出於研究中發現激活劑(activator) Pr3+離子於合成時，Pr3+離子是否已於鈦酸鍶母體(host)中，先形成發光系統所需之能準位(energy levels)，也就是發光體之發光中心，其結果會影響鈦酸鍶母體和敏化劑(sensitizer) Al3+離子間，於整個系統能量傳輸及紅光效率的獲得。而鋁離子的添加提高了整體鈦酸鍶紅光螢光體晶體之成長、結晶性及能量傳輸等。鈦酸鍶系紅光螢光體，其發光特性波長位於615 nm，主要是由Pr3+離子1D2 à 3H4能階之躍遷。
並列摘要
In this study, SrTiO3: Pr3+, Al3+ phosphors were prepared by hydrothermal and solvothermal synthesis method. The products characterized with XRD, SEM, ICP, ESCA, CL and other techniques. It was proved that SrTiO3: Pr3+, Al3+ phosphors with high red luminescence, narrow size distribution smaller than 200 nm, homogeneous chemical composition and red emission efficiency better than commercial phosphors(Y2O3:Eu) can be obtained by the solovthermal treated at 1000 ℃/1h. Another hand the purpose of this paper is to point out that the close relationship between the activator (Pr3+) of energy levels for energy transfer in SrTiO3: Pr3+, Al3+ system, which effects the host to activate energy transfer and red emission efficiency by Pr3+ of levels.The addition Al3+ ions improves the grain growth、crystallinity and energy level of Pr3+ ion that influences energy transfers in SrTiO3:Pr3+, Al3+ phosphor system. This system was characterized by a very intense red emission at 615 nm corresponding to the 1D2à 3H4 inner transition of Pr3+ ions.