New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials.
New Developments in Cathodoluminescence Spectroscopy for the Study of Luminescent Materials.
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DOI：
10.3390/ma10030312
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发表时间：
2017-03-17
期刊：
影响因子：
--
通讯作者：
Silver J
中科院分区：
文献类型：
--
作者：
Engelsen DD;Fern GR;Harris PG;Ireland TG;Silver J
在这里，我们描述了三个先进的技术阴极射线发光（CL）光谱，最近在我们的实验室开发。第一个是一种新的方法，以准确地确定荧光粉薄层的CL效率。当用电子轰击具有带隙（Eg > 5eV）的宽带磷光体时，将发生磷光体颗粒的充电，这最终导致在发光效率的测定中的错误结果。为了克服充电的这个问题，已经开发了一种比较方法，该方法能够精确测量电子束的电流密度。在扫描电子显微镜（SEM）中从磷光体样品的CL的研究是要处理的第二个主题。本文详细介绍了一种在扫描电子显微镜中无光束消隐条件下测定荧光单晶总衰减时间的测量方法。第三种技术是基于伦敦布鲁内尔大学（英国）的透射电子显微镜（TEM）中显微镜和光谱法的独特组合。这种组合使得能够记录纳米尺寸的样品的CL光谱，并通过叠加扫描TEM和CL图像来确定单个颗粒的CL发射的空间变化。
Herein, we describe three advanced techniques for cathodoluminescence (CL) spectroscopy that have recently been developed in our laboratories. The first is a new method to accurately determine the CL-efficiency of thin layers of phosphor powders. When a wide band phosphor with a band gap (Eg > 5 eV) is bombarded with electrons, charging of the phosphor particles will occur, which eventually leads to erroneous results in the determination of the luminous efficacy. To overcome this problem of charging, a comparison method has been developed, which enables accurate measurement of the current density of the electron beam. The study of CL from phosphor specimens in a scanning electron microscope (SEM) is the second subject to be treated. A detailed description of a measuring method to determine the overall decay time of single phosphor crystals in a SEM without beam blanking is presented. The third technique is based on the unique combination of microscopy and spectrometry in the transmission electron microscope (TEM) of Brunel University London (UK). This combination enables the recording of CL-spectra of nanometre-sized specimens and determining spatial variations in CL emission across individual particles by superimposing the scanning TEM and CL-images.
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影响因子：
2.4
作者：
Frase, Carl Georg;Buhr, Egbert;Dirscherl, Kai
通讯作者：
Dirscherl, Kai
影响因子：
4.3
作者：
Götze, J
通讯作者：
Götze, J
影响因子：
3.9
作者：
Cho, SH;Kwon, SH;Kwon, SJ
通讯作者：
Kwon, SJ
影响因子：
1.4
作者：
Chubun, NN;Chakhovskoi, AG;Hunt, CE
通讯作者：
Hunt, CE
影响因子：
2.2
作者：
den Engelsen, Daniel;Harris, Paul;Silver, Jack
通讯作者：
Silver, Jack