以光譜學研究發光晶體能量轉移與大氣分子之光解機制;Spectroscopic Investigations of the Mechanisms of Energy Transfer in Luminescent Crystals and Photolysis of Atmospheric Molecules

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/78183

Title:	以光譜學研究發光晶體能量轉移與大氣分子之光解機制;Spectroscopic Investigations of the Mechanisms of Energy Transfer in Luminescent Crystals and Photolysis of Atmospheric Molecules
Authors:	張伯琛
Contributors:	國立中央大學化學系
Keywords:	發光晶體;激發光譜;發光光譜;時間解析光譜;能量轉移;稀土元素;光解;鹵化甲烷;高激發態鹵素原子;鹵化亞甲基;非線性光學材料;二次倍頻;鈦矽酸鹽;luminescent crystal;excitation spectroscopy;photoluminescence spectroscopy;time-resolved spectroscopy;energy transfer;rare earth element;multiphoton photolysis;halomethanes;highly excited halogens;halocarbene;non-linear optical material;second harmonic generation;titanosilicate
Date:	2018-12-19
Issue Date:	2018-12-20 11:09:52 (UTC+8)
Publisher:	科技部
Abstract:	本實驗室主要以光譜技術研究發光晶體之能量轉移與大氣化學分子之光分解機構，此計畫在延伸目前已有的成果，完成及確認一些實驗資料後就可以發表論文。在發光材料方面，主要以光譜學技術如光致發光光譜(photoluminescence spectra)、激發光譜(excitation spectra)與時間解析光譜(time-resolved spectra)來探討含三價稀土元素離子(trivalent rare earth element)發光晶體內之能量轉移過程(energy transfer processes)，目前已建立初步動力學機構與數學模型，對含Eu3+的化合物實驗數據非常吻合，但是對含Sm3+之化合物仍有許多未明之處，將進一步研究其細節後發表論文。這些研究資料可助於發光材料與太陽能電池之發展。在大氣化學相關分子之研究，此計畫將探討高激發態鹵素原子(highly excited atomic halogens)之形成機制，目前已知溴原子(bromine)和碘原子(iodine)之光譜雖然類似，但其實形成機制並不相同。我們將努力釐清鹵化甲烷類分子之多光子光解機制(multiphoton photolysis mechanism )，並探討相關的雙鹵化亞甲基分子如CI2之分子光譜學，此部分屬於純科學研究，但可增進我們對基礎氣態分子光解的了解。此外，我們和國內其他實驗團隊合作，開發新非線性光學 (non-linear optical, NLO)材料，尤其是二次倍頻(second harmonic generation, SHG)晶體，去年得到嶄新之含鋰鈦矽酸鹽 (lithium-containing titanosilicates)具有極佳之相位匹配二次倍頻訊號(phase-matched SHG)及極優之雷射損傷閥值(laser-induced damage threshold)，具體成果已發表在頂尖期刊J. Am. Chem. Soc.並已獲得美國及台灣專利。在此計畫中將繼續深入研究此一主題，探討晶體結構與非線性光學性質之詳細關聯性，並建立相關SHG結構之理論模型。 ;Our main interest is the spectroscopic studies for to the energy transfer processes in luminescent crystals and the photolysis of atmospheric chemistry species. This proposal is an extension of our accomplishments, and the related publications are expected after some experimental data are completed and confirmed. For luminescent crystals, spectroscopic data such as photoluminescence, excitation, and time-resolved spectra are acquired to elucidate the energy transfer processes between luminescent centers containing trivalent rare earth elements. Detailed mechanisms and accurate kinetics models were developed. These models fit experimental data of compounds containing Eu3+ perfectly, but there still remain unresolved questions in the Sm3+-containing compounds. We will unravel the details of these energy processes and the results will pave the foundation for developing display technology and solar cells. In atmospheric chemistry, the formation mechanisms of highly excited halogens following the photolysis of halomethanes at ultraviolet wavelengths are currently studied. Our results indicate that in spite of their similar spectra, highly excited atomic bromine and atomic iodine have very different formation mechanisms. The detailed differences will be clarified in this proposal. Additionally, we also plan to study the electronic spectroscopy of CI2, which is related to the formation of highly excited iodine and is a challenging subject in molecular spectroscopy. This part of our research is for pure scientific interest, but will help to understand the fundamental gas-phase photolysis. In collaboration with other research groups, we have been developing new non-linear optical (NLO) materials such as second harmonic generation (SHG) crystals. In 2016, we found new lithium-containing titanosilicates that have excellent phase-matched SHG signals and high laser-induced damage threshold. The results were published on J. Am. Chem. Soc., and the related patents are approved in Taiwan as well as in the U.S. We plan to investigate the detailed correlations between the crystal structure and SHG properties. A theoretical model of the SHG-structure correlation is also under development.
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Chemistry] Research Project

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