https://scholars.lib.ntu.edu.tw/handle/123456789/575850
標題: | Hidden Structural Evolution and Bond Valence Control in Near-Infrared Phosphors for Light-Emitting Diodes | 作者: | Fang M.-H RU-SHI LIU et al. |
關鍵字: | Infrared devices; Light emitting diodes; Paramagnetic resonance; Phosphors; Rietveld refinement; Electron-lattice coupling; Inhomogeneous broadening; Internal quantum efficiency; Near-infrared phosphors; Partial substitution; Solid solution process; Structural evolution; Time-resolved spectra; Light emission | 公開日期: | 2021 | 卷: | 6 | 期: | 1 | 起(迄)頁: | 109-114 | 來源出版物: | ACS Energy Letters | 摘要: | We aim to conduct a complete study on the unexpected structure evolution behavior in Cr3+-doped phosphors. A series of Ga2-xScxO3:Cr3+ phosphors are successfully synthesized and confirmed through structural studies, while the lattice parameters change unexpectedly. The unique partial substitution (a87%) of Sc3+ in the octahedral site is demonstrated via Rietveld refinement. Therefore, the bond valence sum calculation explains the reason for this particular Sc3+ concentration. The photoluminescent bandwidth and electron-lattice coupling energy initially increase and then decrease, implying an inhomogeneous broadening effect. Time-resolved spectra and electron paramagnetic resonance are utilized to further examine the subtle change in the microstructures and the second coordination sphere effect of Cr3+. Ga1.594Sc0.4O3:0.006Cr3+ exhibits high internal quantum efficiency (99%) and high phosphor-converted light-emitting diode output power (66.09 mW), demonstrating its capability as an outstanding infrared phosphor. This work will motivate further research on unexpected partial substitution during the solid solution process. ? |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097775443&doi=10.1021%2facsenergylett.0c02373&partnerID=40&md5=478e793c8c63d2851cd3533ea81d7f29 https://scholars.lib.ntu.edu.tw/handle/123456789/575850 |
ISSN: | 23808195 | DOI: | 10.1021/acsenergylett.0c02373 |
顯示於: | 化學系 |
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