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    題名: All-in-one light-tunable borated phosphors with chemical and luminescence dynamical control resolution
    作者: Lin, C.C.;Liu, Y.-P.;Xiao, Zhi Ren
    蕭智仁
    貢獻者: 應物所
    關鍵詞: Electron energy levels;Emission spectroscopy;Energy transfer;Light emitting diodes;Light sources;Manganese;Phosphors;Photoluminescence;devices;DFT investigations;Energy transfer effects;Experimental determination;Fluorescence lifetime measurements;Generalized gradient approximations;Photoluminescence spectrum;Ultraviolet light-emitting diodes;Light emission
    日期: 2014-06
    上傳時間: 2015-06-04 11:25:30 (UTC+8)
    摘要: Single-composition white-emitting phosphors with superior intrinsic properties upon excitation by ultraviolet light-emitting diodes are important constituents of next-generation light sources. Borate-based phosphors, such as NaSrBO3:Ce3+ and NaCaBO3:Ce3+, have stronger absorptions in the near-ultraviolet region as well as better chemical/physical stability than oxides. Energy transfer effects from sensitizer to activator caused by rare-earth ions are mainly found in the obtained photoluminescence spectra and lifetime. The interactive mechanisms of multiple dopants are ambiguous in most cases. We adjust the doping concentration in NaSrBO3:RE (RE = Ce3+, Tb3+, Mn2+) to study the energy transfer effects of Ce3+ to Tb3+ and Mn2+ by comparing the experimental data and theoretical calculation. The vacuum-ultraviolet experimental determination of the electronic energy levels for Ce3+ and Tb3+ in the borate host regarding the 4f-5d and 4f-4f configurations are described. Evaluation of the Ce 3+/Mn2+ intensity ratios as a function of Mn2+ concentration is based on the analysis of the luminescence dynamical process and fluorescence lifetime measurements. The results closely agree with those directly obtained from the emission spectra. Density functional calculations are performed using the generalized gradient approximation plus an on-site Coulombic interaction correction scheme to investigate the forbidden mechanism of interatomic energy transfer between the NaSrBO3:Ce3+ and NaSrBO3:Eu2+ systems. Results indicate that the NaSrBO3:Ce3+, Tb3+, and Mn2+ phosphors can be used as a novel white-emitting component of UV radiation-excited devices. © 2014 American Chemical Society.
    關聯: ACS Applied Materials and Interfaces, 6(12), 9160-9172
    資料類型: article
    DOI 連結: http://dx.doi.org/10.1021/am501232y
    DOI: 10.1021/am501232y
    顯示於類別:[應用物理研究所 ] 期刊論文

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