Image Preprocessing Algorithm for Space Target Space-Based Detection

Haibin, 潘海斌 Pan; Wei, 张伟 Zhang; Mingyu, 丛明煜 Cong; Jun, 程军 Chen; Xianglong, 孟祥龙 Meng; Yiming, 曹移明 Cao

doi:10.3788/aos20092909.2402

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“…The uniqueness of optical, electronic and magnetic properties of rare earth complexes such as europium (Eu) β-diketones has become field of interest [5]. The partially filled 4f electrons of the rare earth ions do not participate in bonding with ligands directly because of the shielding effect of 5s and 5p electrons.…”

Section: Introductionmentioning

confidence: 99%

Effect of UV Treatment on Optical Properties of Low-Density Polyethylene Films Doped with Eu(TTA)<sub>3</sub>phen Complex

Khairuldin

Aziz

Nashaain

et al. 2014

AMR

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Low-Density Polyethylene (LDPE) films doped with Eu (TTA)3phen complex (TTA=2-thenoyltrifluoroacetone, phen=1,10-phenanthroline) were fabricated by hot-blowing technique for thickness of 100 μm. The films were doped with 0.1 % of Eu (TTA)3phen to the total weight of LDPE and exposed to UV irradiation from deuterium lamp for 5, 10, 20, 40 and 60 hours to investigate the effect of its optical properties. The films were characterized by Spectrofluorometer, UV/VIS Spectrophotometer and FT-IR Spectrometer to measure their emission spectra, lifetimes, transmission transparency and chemical bonding. Photoluminescence of the room-temperature Eu (TTA)3phen doped films consist of typical Eu3+emission transition lines with hypersensitive5D07F2emission band at 610 nm. After 20 hours UV treatment, the peak intensity dropped by 90 % and shortened the luminescent lifetimes from 0.654 ms to 0.305 ms. Longer UV treatment also has accelerated degradation in doped LDPE films shown by significant reducing in absorption peak of FTIR at 3395, 3186 and 1645 cm-1. The results would provide a mechanism to improve the lifetime of the LDPE by utilizing the light-manipulation property of Eu (TTA)3phen complex to absorb UV spectrum and covert into red emission.Keywords: LDPE, rare-earth complex, photoluminescence

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Section: Introductionmentioning

confidence: 99%