环境监测-文献订阅-重庆大学图书馆

School of Physics and Electronic Information Engineering Ningxia Normal University Guyuan 756099 ChinaQian Xueshen College Xi’an Jiaotong University Xi’an 710049 China

来源详细信息

关键词： CIE chromaticity characteristics La2–xO3:xSm3+ nanophosphors photoluminescence solution-combustion method

摘要： Novel red-emitting La_2–xO₃:xSm³⁺ nanophosphors with seven different Sm³⁺-doped concentrations were prepared by the solution-combustion method. The crystal structure, morphology, and photoluminescence properties of the La_2–xO₃:xSm³⁺ nanophosphors were characterized by the X-ray diffraction, scanning electron microscopy, and spectroscopy, respectively. The nanophosphors exhibit high intensity and excellent red fluorescence emission under the excitation wavelengths of 234 nm and 409 nm, respectively. The results show that the red fluorescence emission of La_2–xO₃:xSm³⁺ nanophosphors originate from the energy level ⁴G_5/2→⁶H_n (n=5/2–15/2) transition of Sm³⁺. The strongest red fluorescence emission band located at the center wavelength of 654 nm. Under the excitation wavelength of 234 nm, the nanophosphor reaches the strongest red luminescence when the Sm³⁺-doping concentration is 0.5 mol%;Under the excitation wavelength of 409 nm, the quenching concentration for the strongest red emission of the nanophosphor is 1.0 mol%. Using the international CIE 1931 standard chromaticity system, the fluorescence color coordinates of the samples with different doping concentrations under the excitation wavelength of 234 nm and 409 nm were calculated, respectively. And the CIE chromaticity characteristics of the La_2–xO₃:xSm³⁺ nanophosphors were systematically studied. © 2024 《中国科学》杂志社