本文主要研究内容
作者马博文（2019）在《稀土掺杂NaLaF4纳米晶的可控合成与上转换发光特性研究》一文中研究指出：稀土氟化物由于声子能量低和稳定性高等优点,被广泛应用于稀土离子掺杂发光材料。由于NaLaF4具有更低的声子能量和非辐射跃迁几率,上转换发光效率相对较高,使其在生物医疗、太阳能电池、防伪等应用领域有着光明的前景。目前,在NaLaF4纳米晶的合成中,通常需要高温、强碱及较长时间等反应条件,且晶体结构和形貌粒径难以控制。此外,由于形成能较高且La3+离子半径较大,导致制备高质量NaLaF4纳米晶非常困难,严重影响了 NaLaF4纳米晶的上转换发光性能。为制备发光较好的高质量NaLaF4纳米晶,本论文通过引入Gd3+共掺,实现NaLaF4纳米晶的合成,且其晶体结构和形貌粒径可以得到有效调控以及上转换发光得到增强。研究了pH值和反应时间对NaLaF4纳米晶的晶相、形貌的影响,探讨了纳米哑铃的生长机理与形貌对上转换发光的影响。主要研究内容如下:1.应用溶剂热法在乙醇/油酸/水的反应体系中,研究了 Gd3+掺杂浓度变化对于NaLaF4:Er3+/Yb3+纳米晶的形貌粒径、晶体结构和上转换发光的影响。合成出了纯相NaLaF4:Er3+/Yb3+纳米晶,提高了上转换发光效率,并且使得合成方案更高效。实验结果显示:(1)随着Gd3+掺杂浓度的逐渐增加,样品的晶相逐渐变化,当掺杂浓度到达30%和40%时,合成出了纯相的β-NaLaF4:Er3+/Yb3+纳米晶。样品形貌均为纳米棒且不随Gd3+浓度变化而变化,但其粒径呈现逐渐变小的趋势,并且随着Gd3+浓度增加粒径分布变得更均匀。(2)研究了 Gd3+掺杂浓度对NaLaF4:Er3+/Yb3纳米晶上转换发光的影响。实验结果显示,随掺杂浓度增加,上转换发光呈现先增强后减弱的趋势,当Gd3+掺杂浓度为30%时,上转换发光最强。2.调控反应溶液pH值实现了不同形貌NaLaF4:Er3+/Yb3+纳米晶的合成通过调控反应时间探讨了纳米哑铃的生长机理。进一步研究形貌对于NaLaF4:Er3+/Yb3+纳米晶上转换发光的影响,得出以下结论。(1)随着pH值的逐渐增加,样品形貌呈现出纳米棱柱→纳米棒→纳米线的演变过程。在合成纳米棒的实验中,减少反应时间获得纳米哑铃。然后,通过调控反应时间研究纳米哑铃的生长机理发现,当反应时间为6h合成出六角盘状LaF3纳米晶,当时间延长至9小时合成出了纳米哑铃状NaLaF4,延长时间至10h形貌则演变为纳米棒。(2)不同形貌的NaLaF4:Er3+/Yb3+纳米晶表现出相似的上转换发光,均在540nm和650nm附近有着尖锐的发射峰且红光强于绿光。
Abstract
xi tu fu hua wu you yu sheng zi neng liang di he wen ding xing gao deng you dian ,bei an fan ying yong yu xi tu li zi can za fa guang cai liao 。you yu NaLaF4ju you geng di de sheng zi neng liang he fei fu she yue qian ji lv ,shang zhuai huan fa guang xiao lv xiang dui jiao gao ,shi ji zai sheng wu yi liao 、tai yang neng dian chi 、fang wei deng ying yong ling yu you zhao guang ming de qian jing 。mu qian ,zai NaLaF4na mi jing de ge cheng zhong ,tong chang xu yao gao wen 、jiang jian ji jiao chang shi jian deng fan ying tiao jian ,ju jing ti jie gou he xing mao li jing nan yi kong zhi 。ci wai ,you yu xing cheng neng jiao gao ju La3+li zi ban jing jiao da ,dao zhi zhi bei gao zhi liang NaLaF4na mi jing fei chang kun nan ,yan chong ying xiang le NaLaF4na mi jing de shang zhuai huan fa guang xing neng 。wei zhi bei fa guang jiao hao de gao zhi liang NaLaF4na mi jing ,ben lun wen tong guo yin ru Gd3+gong can ,shi xian NaLaF4na mi jing de ge cheng ,ju ji jing ti jie gou he xing mao li jing ke yi de dao you xiao diao kong yi ji shang zhuai huan fa guang de dao zeng jiang 。yan jiu le pHzhi he fan ying shi jian dui NaLaF4na mi jing de jing xiang 、xing mao de ying xiang ,tan tao le na mi e ling de sheng chang ji li yu xing mao dui shang zhuai huan fa guang de ying xiang 。zhu yao yan jiu nei rong ru xia :1.ying yong rong ji re fa zai yi chun /you suan /shui de fan ying ti ji zhong ,yan jiu le Gd3+can za nong du bian hua dui yu NaLaF4:Er3+/Yb3+na mi jing de xing mao li jing 、jing ti jie gou he shang zhuai huan fa guang de ying xiang 。ge cheng chu le chun xiang NaLaF4:Er3+/Yb3+na mi jing ,di gao le shang zhuai huan fa guang xiao lv ,bing ju shi de ge cheng fang an geng gao xiao 。shi yan jie guo xian shi :(1)sui zhao Gd3+can za nong du de zhu jian zeng jia ,yang pin de jing xiang zhu jian bian hua ,dang can za nong du dao da 30%he 40%shi ,ge cheng chu le chun xiang de β-NaLaF4:Er3+/Yb3+na mi jing 。yang pin xing mao jun wei na mi bang ju bu sui Gd3+nong du bian hua er bian hua ,dan ji li jing cheng xian zhu jian bian xiao de qu shi ,bing ju sui zhao Gd3+nong du zeng jia li jing fen bu bian de geng jun yun 。(2)yan jiu le Gd3+can za nong du dui NaLaF4:Er3+/Yb3na mi jing shang zhuai huan fa guang de ying xiang 。shi yan jie guo xian shi ,sui can za nong du zeng jia ,shang zhuai huan fa guang cheng xian xian zeng jiang hou jian ruo de qu shi ,dang Gd3+can za nong du wei 30%shi ,shang zhuai huan fa guang zui jiang 。2.diao kong fan ying rong ye pHzhi shi xian le bu tong xing mao NaLaF4:Er3+/Yb3+na mi jing de ge cheng tong guo diao kong fan ying shi jian tan tao le na mi e ling de sheng chang ji li 。jin yi bu yan jiu xing mao dui yu NaLaF4:Er3+/Yb3+na mi jing shang zhuai huan fa guang de ying xiang ,de chu yi xia jie lun 。(1)sui zhao pHzhi de zhu jian zeng jia ,yang pin xing mao cheng xian chu na mi leng zhu →na mi bang →na mi xian de yan bian guo cheng 。zai ge cheng na mi bang de shi yan zhong ,jian shao fan ying shi jian huo de na mi e ling 。ran hou ,tong guo diao kong fan ying shi jian yan jiu na mi e ling de sheng chang ji li fa xian ,dang fan ying shi jian wei 6hge cheng chu liu jiao pan zhuang LaF3na mi jing ,dang shi jian yan chang zhi 9xiao shi ge cheng chu le na mi e ling zhuang NaLaF4,yan chang shi jian zhi 10hxing mao ze yan bian wei na mi bang 。(2)bu tong xing mao de NaLaF4:Er3+/Yb3+na mi jing biao xian chu xiang shi de shang zhuai huan fa guang ,jun zai 540nmhe 650nmfu jin you zhao jian rui de fa she feng ju gong guang jiang yu lu guang 。
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论文详细介绍
论文作者分别是来自陕西师范大学的马博文，发表于刊物陕西师范大学2019-10-14论文，是一篇关于稀土掺杂论文,溶剂热法论文,纳米哑铃论文,上转换发光论文,陕西师范大学2019-10-14论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自陕西师范大学2019-10-14论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：稀土掺杂论文; 溶剂热法论文; 纳米哑铃论文; 上转换发光论文; 陕西师范大学2019-10-14论文;