https://scholars.lib.ntu.edu.tw/handle/123456789/575820
標題: | Thermally Stable and Deep Red Luminescence of Sr1-xBax[Mg2Al2N4]:Eu2+ (x = 0-1) Phosphors for Solid State and Agricultural Lighting Applications | 作者: | Lean? J.L Mariano C.O.M Huang W.-T Mahlik S Lesniewski T Grinberg M Sheu H.-S Hu S.-F Liu R.-S. RU-SHI LIU |
關鍵字: | Barium; Crystal structure; Lighting; Luminescence; Phosphors; Sintering; Thermodynamic stability; X ray absorption; Gas-pressure sintering; Lighting applications; Luminescence properties; Photoluminescence properties; Red emitting phosphor; Stability measurements; Synchrotron x ray diffraction; X-ray absorption near edge spectroscopy; Red Shift | 公開日期: | 2020 | 卷: | 12 | 期: | 20 | 起(迄)頁: | 23165-23171 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | The systematic substitution of Ba in the Sr site of Sr[Mg2Al2N4]:Eu2+ generates a deep-red-emitting phosphor with enhanced thermal luminescence properties. Gas pressure sintering (GPS) of all-nitride starting materials in Molybdenum (Mo) crucibles yields pure-phase red-orange-colored phosphors. Peaks in the synchrotron X-ray diffraction (SXRD) data show a systematic shift toward smaller angles due to the introduction of the larger Ba cation in the same crystal structure. The photoluminescence property reveals that Ba substitution shifts the original emission wavelength of Sr[Mg2Al2N4]:Eu2+ (625 nm) toward a690 nm for Ba[Mg2Al2N4]:Eu2+. Thermal stability measurement of Sr1-xBax[Mg2Al2N4] indicates a systematic increase in stability from x = 0 to x = 1. X-ray absorption near-edge spectroscopy (XANES) results demonstrate the coexistence of Eu2+ and Eu3+. The red-shift and the enhanced thermal stability reveals that the distance of the emitting 5d level to the conduction band of Ba[Mg2Al2N4]:Eu2+ is large. The ionic size mismatch of Eu occupying a Ba site reduces the symmetry, thereby further splitting the degenerate emitting 5d level and lowering the energy of the emitting center. The development of deep-red phosphors emitting at 670-690 nm (x = 0.8-1.0) offers possible candidates for plant lighting applications. ? 2020 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85085535641&doi=10.1021%2facsami.0c07345&partnerID=40&md5=6b03565454bc24fa6ea17a796b17d05f https://scholars.lib.ntu.edu.tw/handle/123456789/575820 |
ISSN: | 19448244 | DOI: | 10.1021/acsami.0c07345 |
顯示於: | 化學系 |
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