|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|4765732||1362360||2018||8 صفحه PDF||ندارد||دانلود رایگان|
â¢A novel fully concentrated intense green emitting nanophosphor is identified.â¢First time report on the synthesis of Terbium oxalate nanocrystals.â¢Extremely low particle size (2-4Â nm) suggests applications in bio-medical field.â¢The CIE coordinates suggest enhanced colour purity for green emission.
Green emitting novel Terbium oxalate decahydrate nanophosphor (Tb2(C2O4)3.10H2O) with particle size in the range 2â4Â nm, was synthesized by microwave assisted co-precipitation method. The structure and particle size of the sample were elucidated by X-ray powder diffraction and TEM analysis. The photoluminescence excitation spectra of the terbium oxalate nanophosphor exhibited several peaks in the 200-500Â nm range of DUV to visible region with the strongest one at 369Â nm in n-UV region and these excitation peaks matches well with the emission peaks of commercially available LED sources. The emission spectra recorded at the representative excitations exhibit intense and sharp green emission (5D4â7F5, at 543Â nm) owing to the heavy population of 5D4 level at the expense of 5D3 level of Terbium ion. The decay curve is fitted to single exponential function with a decay time of 0.82Â ms. The chromaticity co-ordinate is found to be (0.25, 0.54) and is located in green region with a colour purity of 68%. The experimental observations revealed that the synthesized ultrafine terbium oxalate nanocrystal is a suitable candidate as green emitting phosphor.
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Journal: Dyes and Pigments - Volume 148, January 2018, Pages 386-393