【作者】 吐尔逊·艾迪力比克； 邓楷模； 陈永虎； 艾尔肯·斯地克； 尹民；

【机构】 新疆师范大学； 新疆伊犁师范学院； 中国科技大学；

【摘要】 当LiGdF₄:Eu材料被首次报道在真空紫外激发后其量子效应可达到200%,量子剪裁材料就成为了一个热门的研究方向。高效率的下转换通常是基于量子剪裁荧光材料可以在每一次吸收高能量的光子之后产生两个低能量光子的原理实现的。而最近发现近红外区的量子剪裁荧光材料有可能提高以Si为衬底的太阳能电池的能量转换效率。将紫外线或者蓝光进行裁剪而得到的两个近红外区低能量光子很容易被太阳能电池吸收。因此,寻找一对能够实现高能量转换的敏化剂及激活剂显得格外重要。而Ho³⁺可以作为近红外量子裁剪材料的敏化剂,LaF₃作为基质掺杂Ho³⁺及Yb³⁺来研究量子剪裁机制及其能量转换效率。Ho³⁺（0.5mol%）及Yb³⁺（0,5,10,15,20 mol%）掺杂的LaF₃的样品可通过共沉淀法合成。将样品进行XRD,发射光谱,激发光谱,发光衰减曲线,红外发射光谱测试。通过XRD测试看Yb_xLa_0.995-xF₃:Ho_0.005（x=0,5,10,15,20 mol%）是否为纯相;发光光谱及激发光谱测试来验证Ho³⁺到Yb³⁺能量转移;发光衰减曲线可以进一步验证此能量转移并给出定量的数值关系;通过红外发射光谱测试我们可以研究这种转移机制。通过上述实验,我们证实了Ho-Yb之间存在量子剪裁过程,同时计算了能量传递效率和量子效率。更多还原

【Abstract】 Since LiGdF₄:Eu has been first reported of a quantum efficiency close to 200%,there have been increasing research efforts in the quantum cutting materials.The possibility of the large down-conversion efficiency is based on the principle that quantum cutting phosphors could generate two low-energy photons for every incident high energy photon absorption.Now,the investigation on quantum cutting phosphors has been extended to the near-infrared region due to their potential application in improving the energy conversion efficiency of silicon-based Solar Photovoltaics.The process of cutting one ultraviolet or blue photon into two near-infrared lower energy photons,which can both be better absorbed by the solar cells.It seems significant to find a couple of sensitizer and activator in which a higher energy transfer efficiency can be achieved.The trivalent Holmium Ho³⁺ is a promising candidate sensitizer for the near-infrared quantum cutting material.LaF₃ was chosen as a host to incorporate Ho³⁺ and Yb³⁺ to investigate the energy transfer efficiency and quantum cutting mechanism.The powder samples of LaF₃ doped with Ho³⁺（0.5mol%） and Yb³⁺（0,5,10,15,20 mol%） were synthesized by coprecipitation method.X-ray diffraction.Emission spectra,excitation spectra,and decay curves could be used to characterize the samples.The excellent luminescence properties of the Ho³⁺ -Yb³⁺ codoped LaF₃ could show its potential application in improving the energy conversion efficiency of the silicon based solar cells.更多还原