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Control of Luminescence by Tuning of Crystal Symmetry and Local Structure in Mn4+‐Activated Narrow Band Fluoride Phosphors |
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| Authors: | Mu‐Huai Fang Wei‐Lun Wu Prof Dr Ye Jin Tadeusz Lesniewski Dr Sebastian Mahlik Prof Dr Marek Grinberg Prof Dr Mikhail G Brik Dr Alok M Srivastava Dr Chang‐Yang Chiang Prof Dr Wuzong Zhou Dr Donghyuk Jeong Prof Dr Sun Hee Kim Dr Grzegorz Leniec Prof Dr Slawomir M Kaczmarek Dr Hwo‐Shuenn Sheu Prof Dr Ru‐Shi Liu |
| Affiliation: | 1. Department of Chemistry, National Taiwan University, Taipei, Taiwan;2. School of Science, Chongqing University of Technology, Chongqing, China;3. Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdansk, Poland;4. College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing, China;5. Institute of Physics, University of Tartu, Tartu, Estonia;6. Institute of Physics, Jan Dlugosz University, Czestochowa, Poland;7. GE Global Research, One Research Circle, Niskayuna, NY, USA;8. EaStCHEM, School of Chemistry, University of St Andrews, St Andrews, UK;9. Western Seoul Center, Korea Basic Science Institute, University–Industry Cooperation Building, Seoul, Korea;10. Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin, Szczecin, Poland;11. National Synchrotron Radiation Research Center, Hsinchu, Taiwan;12. Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, Taiwan |
| Abstract: | Mn4+‐doped fluoride phosphors have been widely used in wide‐gamut backlighting devices because of their extremely narrow emission band. Solid solutions of Na2(SixGe1?x)F6:Mn4+ and Na2(GeyTi1?y)F6:Mn4+ were successfully synthesized to elucidate the behavior of the zero‐phonon line (ZPL) in different structures. The ratio between ZPL and the highest emission intensity υ6 phonon sideband exhibits a strong relationship with luminescent decay rate. First‐principles calculations are conducted to model the variation in the structural and electronic properties of the prepared solid solutions as a function of the composition. To compensate for the limitations of the Rietveld refinement, electron paramagnetic resonance and high‐resolution steady‐state emission spectra are used to confirm the diverse local environment for Mn4+ in the structure. Finally, the spectral luminous efficacy of radiation (LER) is used to reveal the important role of ZPL in practical applications. |
| Keywords: | backlighting narrow-band-emission red fluoride phosphors white-light-emitting diodes zero-phonon line |
