https://scholars.lib.ntu.edu.tw/handle/123456789/629075
標題: | Pentavalent Manganese Luminescence: Designing Narrow-Band Near-Infrared Light-Emitting Diodes as Next-Generation Compact Light Sources | 作者: | Rajendran, V Chen, KC Huang, WT Majewska, N Lesniewski, T Grzegorczyk, M Mahlik, S Leniec, G Kaczmarek, SM Pang, WK Peterson, VK Lu, KM Chang, Ho RU-SHI LIU |
關鍵字: | STRUCTURAL EVOLUTION; ENERGY-TRANSFER; PHOSPHORS; EMISSION; SPECTRA; SPECTROSCOPY; MN4+ | 公開日期: | 2023 | 出版社: | AMER CHEMICAL SOC | 卷: | 8 | 期: | 1 | 起(迄)頁: | 289 | 來源出版物: | ACS ENERGY LETTERS | 摘要: | Manganese in the pentavalent state (Mn5+) is both rare and central in materials exhibiting narrow-band near-infrared (NIR) emission and is highly sought after for phosphor-converted light-emitting diodes as promising candidates for future miniature solid-state NIR light source. We develop the Ca14Zn6Ga10-xMnxO35 (x = 0.3, 0.5, 1.0, 1.25, 1.5, and 3.0) series that exhibit simultaneous Mn4+ (650-750 nm) and Mn5+ (1100-1250 nm) luminescence. We reveal a preferential occupancy of Mn in regular octahedral and tetrahedral environments, with the short bond length between these responsible for luminescence. We present a theoretical spin-orbital interaction model in which breaking the spin selection rule permits the luminescence of Mn4+ and Mn5+. A total photon flux of 87.5 mW under a 7 mA driving current demonstrates its potential for real-time application. This work pushes our understanding of achieving Mn5+ luminescence and opens the way for the design of Mn5+-based narrow-band NIR phosphors. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/629075 | ISSN: | 2380-8195 | DOI: | 10.1021/acsenergylett.2c02403 |
顯示於: | 化學系 |
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