Ce^(3+)/Tb^(3+) co-doped and Ce^(3+)/Tb^(3+)/Eu^(3+) tri-doped β-NaYF_(4) photoluminescent microcrystals using oleic acid as surfactant were synthesized using the solvothermal *** microstructural characteristics and ...
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Ce^(3+)/Tb^(3+) co-doped and Ce^(3+)/Tb^(3+)/Eu^(3+) tri-doped β-NaYF_(4) photoluminescent microcrystals using oleic acid as surfactant were synthesized using the solvothermal *** microstructural characteristics and photoluminescence properties were investigated in *** have the shape of hexagonal prism bipyramids with uniform particle size,which decreases with the concentrations of Tb^(3+) and Eu^(3+).The energy transfer processes of both the Ce^(3+)→Tb^(3+) and the Ce^(3+)→Tb^(3+)→Eu^(3+) were systematically *** with Eu^(3+) or Tb^(3+) single-doped β-NaYF_(4) microcrystals,the sensitization by Ce^(3+) for the photoluminescence of Tb^(3+) and Eu^(3+) leads to a broad excitation spectral bandwidth in the ultraviolet (UV) ***,the corresponding optical absorption efficiency is greatly *** energy transfer efficiencies have been observed from Ce^(3+) to Tb^(3+) and from Tb^(3+) to Eu^(3+).
As the infrastructure of urban buildings, the building energy system is an important source of building energy consumption and carbon emissions. With the promotion of national energy-saving and emission-reduction poli...
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As the infrastructure of urban buildings, the building energy system is an important source of building energy consumption and carbon emissions. With the promotion of national energy-saving and emission-reduction poli...
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ISBN:
(纸本)9781665435253
As the infrastructure of urban buildings, the building energy system is an important source of building energy consumption and carbon emissions. With the promotion of national energy-saving and emission-reduction policies, more and more new energy and renewable energy utilization technologies are put into use in the construction field. The degree of impact of these technologies on the environment from the perspective of global warming requires a reasonable evaluation. Based on big data, this paper studies the construction of the carbon emission model of the building energy system based on big data, and optimizes the calculation accuracy of carbon emission.
Face dejection Is very important in video surveillance of public safely. This paper proposed a face dejection method based on the best optimization convex grouping to detect the face regions from different face shape ...
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Mud pulse signal extracting in Wireless measure while drilling (MWD) was a core technology in the process of oil drilling development. Whether the resolution of detected mud pulse signal start point location is accura...
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An on-demand weighed clustering algorithm is proposed against the limitation of wireless sensor network nodes with limited energy. This algorithm obtains more local network information by means of information interact...
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A new method of image segmentation based on 3-D maximum between-cluster variance is proposed. The method uses gray distribution information, neighborhood related information and gradient structure information of pixel...
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