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Título: | Chasing down the Eu2+ ions: the delicate structure−property relationships in the ultra-narrow band phosphor K1.6Na2.1Li0.3[Li3SiO4]4:Eu2+ |
Autor: | Ruegenberg, Freia; García-Fuente, Amador CSIC ORCID; Seibald, Markus; Baumann, Dominik; Peschke, Simon; Urland, Werner; Meijerink, Andries; Huppertz, Hubert; Suta, Markus | Fecha de publicación: | 2021 | Editor: | Wiley-VCH | Citación: | Advanced Optical Materials 9(24): 2101643 (2021) | Resumen: | Eu2+-activated phosphors of the UCr4C4 structure type have emerged as promising new (ultra-)narrow band phosphors. Especially the UCr4C4-type alkali lithosilicates have caused a sensation in the field of phosphor research in the recent years due to their consistent (ultra)narrow-band luminescence in the cyan and green range that can pave the way to novel backlighting LEDs with high color gamut. The compound “K2Na2[Li3SiO4]4:Eu2+” stands out with a strikingly narrow emission in the cyan range (<0.2 eV or <30 nm full width at half maximum in the energy or wavelength scale, respectively) but the position of the Eu2+ ions within this structure has been so far controversial. High-resolution photoluminescence spectroscopy at 10 K reveals a complex emission spectrum with seven emission bands in the violet to green range. Combination with single-crystal X-ray diffraction (SCXRD) demonstrates that the cation channels in the structure also contain Li+ ions. The presence of emission bands in the violet and blue spectral range reveals that the Eu2+ ions also occupy the available K sites in the structure independently confirmed by advanced ligand field calculations. This study demonstrates that a combination of SCXRD, photoluminescence spectroscopy, and theory can help elucidate advanced structural problems. | Versión del editor: | https://doi.org/10.1002/adom.202101643 | URI: | http://hdl.handle.net/10261/267003 | DOI: | 10.1002/adom.202101643 | E-ISSN: | 2195-1071 |
Aparece en las colecciones: | (CINN) Artículos |
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