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首页> 美国卫生研究院文献>Materials >White Light Emission from Thin-Film Samples of ZnO Nanocrystals Eu3+ and Tb3+ Ions Embedded in an SiO2 Matrix
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White Light Emission from Thin-Film Samples of ZnO Nanocrystals Eu3+ and Tb3+ Ions Embedded in an SiO2 Matrix

机译：ZnO纳米薄膜嵌入到SiO2基质中的Eu3 +和Tb3 +离子的薄膜样品的白光发射

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In this work, a method was developed to determine the concentration of Eu3+ and Tb3+ ions in a thin-film sample of SiO2, co-doped with ZnO-nanocrystals (ZnO-nc), to produce a sample of any desired colour in the International Commission on Illumination (CIE) colour space. Using this method, a white light emitting sample was fabricated. The thin-film sample combines red, green and blue emissions from the Eu3+ ions, Tb3+ ions and ZnO-nc, respectively, to create white light or light of any desired colour. The emissions at 614 nm and 545 nm from Eu3+ and Tb3+ ions, respectively, is due to the energy transfer from the excited ZnO-nc to the rare-earth (RE) ions. In this way, only a single excitation wavelength is needed to excite the ZnO-nc, Eu3+ and Tb3+ ions in the sample to produce emission of a desired colour from the sample. We developed an empirical 4th-degree polynomial equation to determine the concentrations of Eu3+ and Tb3+ ions to produce light of any desired colour in the CIE colour space. Based on the above empirical equation, the concentration of Eu3+ and Tb3+ ions for a white light emitting sample was found to be 0.012 and 0.024 molar fractions, respectively. The white light emission from the sample was confirmed by fabricating the sample using the low-cost sol–gel process. The stimulated emission spectra and the experimental emission spectra of the white light sample fit very well. The results presented in this work are important to develop energy efficient solid state lighting devices.
机译：在这项工作中，开发了一种确定ZnO-共掺杂的SiO2薄膜样品中Eu 3 + 和Tb 3 + 离子的浓度的方法。纳米晶体（ZnO-nc），以在国际照明委员会（CIE）颜色空间中产生任何所需颜色的样品。使用这种方法，制备了发射白光的样品。薄膜样品结合了Eu 3 + 离子，Tb 3 + 离子和ZnO-nc的红色，绿色和蓝色发射，以产生白光或白光。任何所需的颜色。 Eu 3 + 和Tb 3 + 离子在614 nm和545 nm处的发射分别是由于能量从激发的ZnO-nc转移到稀有的地球（RE）离子。这样，仅需一个激发波长即可激发样品中的ZnO-nc，Eu 3 + 和Tb 3 + 离子，从而发出所需颜色的光。从样本。我们开发了一个经验四阶多项式方程，以确定Eu 3 + 和Tb 3 + 离子的浓度，以在CIE颜色空间中产生任何所需颜色的光。根据上述经验方程，发白光样品的Eu 3 + 和Tb 3 + 离子的浓度分别为0.012和0.024摩尔分数。样品的白光发射是通过使用低成本的溶胶-凝胶工艺制备的样品确定的。白光样品的受激发射光谱和实验发射光谱非常吻合。这项工作中提出的结果对于开发节能固态照明设备很重要。

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