L-cystine is successfully used as a kind of sulfur source to grow CuInS_(2) nanocrystallines at 200℃ for 18 h in a mixed solution made of 20mL ethylenediamine and 20mL distilled water.The diameter of the CuInS_(2) na...L-cystine is successfully used as a kind of sulfur source to grow CuInS_(2) nanocrystallines at 200℃ for 18 h in a mixed solution made of 20mL ethylenediamine and 20mL distilled water.The diameter of the CuInS_(2) nanocrystallines ranges from 300 to 500 nm.The structure of nanocrystallines is determined to be of the tetragonal phase of CuInS_(2).A reasonable possible mechanism for the growth of CuInS_(2) nanocrystallines is proposed.The as-obtained CuInS_(2) products are examined using diverse techniques including x-ray powder diffraction,xray photoelectron spectroscopy,field-emission scanning electron microscopy,transmission electron microscopy,selected-area electron diffraction and high-resolution transmission electron microscopy.展开更多
We described the synthesis and luminescence of Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ phosphor for light emitting diode （LED）. The crystal-linity, morphology, structure, and luminescence spectra were examined by X-ray diffr...We described the synthesis and luminescence of Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ phosphor for light emitting diode （LED）. The crystal-linity, morphology, structure, and luminescence spectra were examined by X-ray diffraction, field emission-scanning electron microscopy and photoluminescence spectroscopy. The results showed that Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ phase was a dominating phase with little impurity phase peaks of Y2O3 when the sintered temperature reached to 1400 oC. Field emission scanning electron microscopy （FE-SEM） images showed the particle size of the phosphor was about 3 μm. Meanwhile, the excitation and emission spectra indicated that the as-prepared phosphors could be effectively excited by blue （460 nm） light and the excitation spectrum showed a broad band extending from 400-500 nm, while emission spectrum showed a broad yellow band peaking at 534 nm. The decay curve at the emission peak consisted of fast and slow components. The Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ should be a promising yellow phosphor for near blue-based white-light-emitting diodes （LEDs）.展开更多
基金Supported by the National Natural Science Foundation under Grant Nos 50772075 and 50972107.
文摘L-cystine is successfully used as a kind of sulfur source to grow CuInS_(2) nanocrystallines at 200℃ for 18 h in a mixed solution made of 20mL ethylenediamine and 20mL distilled water.The diameter of the CuInS_(2) nanocrystallines ranges from 300 to 500 nm.The structure of nanocrystallines is determined to be of the tetragonal phase of CuInS_(2).A reasonable possible mechanism for the growth of CuInS_(2) nanocrystallines is proposed.The as-obtained CuInS_(2) products are examined using diverse techniques including x-ray powder diffraction,xray photoelectron spectroscopy,field-emission scanning electron microscopy,transmission electron microscopy,selected-area electron diffraction and high-resolution transmission electron microscopy.
基金Project supported by National Natural Science Foundation of China (51172165)Key Foundation of Zhejiang Province Natural Science Foundation(Z4110347)+2 种基金Zhejiang Province Key Technology Innovation Team (2009R50010)Wenzhou Municipal Science and Technology Bureau Key Program (G20090082)Huzhou Municipal Natural Science Foundation (2011YZ02)
文摘We described the synthesis and luminescence of Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ phosphor for light emitting diode （LED）. The crystal-linity, morphology, structure, and luminescence spectra were examined by X-ray diffraction, field emission-scanning electron microscopy and photoluminescence spectroscopy. The results showed that Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ phase was a dominating phase with little impurity phase peaks of Y2O3 when the sintered temperature reached to 1400 oC. Field emission scanning electron microscopy （FE-SEM） images showed the particle size of the phosphor was about 3 μm. Meanwhile, the excitation and emission spectra indicated that the as-prepared phosphors could be effectively excited by blue （460 nm） light and the excitation spectrum showed a broad band extending from 400-500 nm, while emission spectrum showed a broad yellow band peaking at 534 nm. The decay curve at the emission peak consisted of fast and slow components. The Ca1.5Y1.5Al3.5Si1.5O12：Ce^3＋ should be a promising yellow phosphor for near blue-based white-light-emitting diodes （LEDs）.
