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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Photoluminescence properties of PVP/Eu(TTA)_2(Phen _3PO)_2NO_3 nanocomposites
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Photoluminescence properties of PVP/Eu(TTA)_2(Phen _3PO)_2NO_3 nanocomposites

机译：PVP / Eu（TTA）_2（Phen _3PO）_2NO_3纳米复合材料的光致发光特性

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摘要

Thin films (1-10 μm thickness) of nanocomposites (NC) based on organic coordinated compound (OCC) Eu(TTA)_2(Phen_3PO) _2NO_3 (where TTA is thenoyltrifluoroacetonate (C _8H_5F_3O_2S), Phen - 1,10-phenanthroline (C_(12)H_8N_2)) and polymer - polyvinylpyrrolidone ((C_6H_9NO)_n) (PVP)) were obtained by chemical methods. NC were characterized by measurements of optical transmission, and photoluminescence (PL) at different concentrations of Eu(TTA)_2(Phen_3PO)_2NO_3 in NC. Using the optical transmission spectra, the characteristic parameters of NC such as threshold of absorbance and the position of the absorption edge on the concentration of the OOC in NC, etc., were determined. The light displacement of threshold absorption to infrared region was observed with increasing of concentration of coordinated material in NC. It was established that the excitation spectrum at which the photoluminescence in NC take place cover the range of wavelength from 200 to 410 nm. The PL of nanocomposites was detected as specific for internal transitions 4f-4f of the Eu~(3+) ion ~5D_0 → ~7F_i (i = 0,1,2,3 and 4) centred at 537, 580, 615, 650 and 702 nm, respectively at T = 300 K. The dominant PL was observed at 615 nm and its halfwidth is less than 10 nm. The intensity of photoluminescence at 615 nm of NC is 2 times higher than the value of intensity of PL of Eu(TTA)_2(Phen_3PO)_2NO _3 powders at equal conditions of excitation.
机译：基于有机配位化合物（OCC）Eu（TTA）_2（Phen_3PO）_2NO_3（其中TTA为壬基三氟丙酮酸酯（C _8H_5F_3O_2S），苯基-1,10-菲咯啉（C_通过化学方法获得（12）H_8N_2））和聚合物-聚乙烯吡咯烷酮（（C_6H_9NO）_n）（PVP））。通过在NC中不同浓度的Eu（TTA）_2（Phen_3PO）_2NO_3的光透射率和光致发光（PL）测量来表征NC。使用光透射光谱，确定NC的特征参数，例如吸光度的阈值和吸收边缘在NC中OOC浓度上的位置等。随着NC中配位物质浓度的增加，观察到阈值吸收向红外区的光位移。可以确定，在NC中发生光致发光的激发光谱覆盖200至410 nm的波长范围。检测到纳米复合材料的PL对Eu〜（3+）离子〜5D_0→〜7F_i（i = 0、1、2、3和4）的内部跃迁4f-4f特定，中心位于537、580、615、650 T = 300 K时为702 nm和702 nm。在615 nm处观察到主要PL，其半峰宽小于10 nm。在相同激发条件下，NC 615 nm处的光致发光强度比Eu（TTA）_2（Phen_3PO）_2NO_3粉末的PL强度高2倍。

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