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Ji Young Ju Seulgi Ji Sanjith Unithrattil Sun Sook Lee Yongseon Kim Ha-kyun Jung Yongku Kang Won Bin Im Sungho Choi 《Ceramics International》2019,45(7):9522-9528
Electrochemical behavior of different MnOx @reduced graphene oxide (rGO) composites derived from a MnO2/GO template are thoroughly investigated. As-prepared MnO2/GO mixture is gradually converted to MnO2/rGO and finally to Mn3O4/rGO composites under controlled post annealing conditions. The semispherical Mn3O4 crystalline compound anchored composite exhibits stable electrode performances, including both the Li+ anode and the Li+-air cathode catalyst, induced by the electrochemically favorable composite with an effective large contact area between the active materials and the electronic conductive rGO. It is such a meaningful to suggest the facile and controllable synthetic procedures for obtaining Li-rechargeable electrodes with a MnOx nanoparticle-incorporated composites for the highly reactive lithiation/delithiation electrochemical reactions. 相似文献
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Enhanced Optical Properties of Bredigite‐Structure Ca13.7Eu0.3Mg2[SiO4]8 Phosphor: Effective Eu Reduction by La Co‐Doping 下载免费PDF全文
Seung Jun Kim Ho Seong Jang Sanjith Unithrattil Yoon Hwa Kim Won Bin Im 《Journal of the American Ceramic Society》2016,99(2):557-563
A green phosphor, La0.4Ca13.3Eu0.3Mg2Si8O31.6+δN0.4?δ (LaCMSN:Eu2+), was prepared by a solid‐state reaction and an efficient green emission was observed at 506 nm under near‐ultraviolet (NUV) excitation. The structural and optical properties of LaCMSN:Eu2+ phosphors as well as their thermal quenching were investigated. The partial substitution of La3+ and N3? in Ca13.7Eu0.3Mg2Si8O32 led to a considerable enhancement in the peak emission intensity by as much as 194%. This demonstrates not only that the total number of Eu2+ activators increased, but also that the probability of a nonradiative transition between Eu2+ and Eu3+ could be reduced as the increase in concentration of the former is at the expense of the later. The white light‐emitting diode (LED) was fabricated using phosphor with a NUV LED chip. The LED showed warm white light with an excellent color rendering index of 91. The LaCMSN:Eu2+ is thus a potential green‐emitting phosphor for white LEDs. 相似文献
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Sanjith Unithrattil Kyoung Hwa Lee Won Bin Im 《Journal of the American Ceramic Society》2014,97(3):874-879
The Eu2+, M‐codoped(M = Ce3+, Mn2+) phosphor powders were prepared by a solid‐state reaction. The addition of Ce3+ in the Eu2+ sites in partially nitridated bredigite‐structure phosphor(CMSN) remarkably enhances the luminescent intensity by ~180% through sensitized luminescence. Dual band emission was observed for Eu, Mn‐codoped CMSN through energy transfer from Eu2+ to Mn2+. Ce3+–Eu2+ and Eu2+–Mn2+ energy‐transfer mechanism was investigated through decay profile analysis using Inokuti–Hirayama model and energy‐transfer parameters are determined. Interaction mechanism was identified as dipole–dipole interaction. In addition, phosphor in glass plates was prepared using the phosphor and its feasibility in white LED application was studied and is presented. 相似文献
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