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Synthesis of RE6–xCa1.5xSi11N20O (RE = Yb, Lu; x ≈ 2.2) with Lu6–xCa1.5xSi11N20O:Ce3+ Offering Interesting Spectral Properties for Yellow‐Emitting Phosphors in 1pcLEDs
- Source :
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European Journal of Inorganic Chemistry . 12/19/2019, Vol. 2019 Issue 47, p4985-4993. 9p. - Publication Year :
- 2019
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Abstract
- The oxonitridosilicates RE6–xCa1.5xSi11N20O (RE = Yb, Lu; x ≈ 2.2) were synthesized starting from REF3, CaH2, and "Si(NH)2" in a radiofrequency furnace at 1600 or 1400 °C, respectively. The crystal structure was solved and refined from single‐crystal X‐ray diffraction data of dark red Yb6–xCa1.5xSi11N20O crystals in the trigonal space group P31c (no. 159) with a = 9.8281(10), c = 10.5968(13) Å and Z = 2. The structure represents a filled variant of the Er6Si11N20O structure type, in which the charge difference caused by substitution of trivalent Yb3+ with bivalent Ca2+ is balanced by occupation of an additional third cation site. Synthesis of Lu6–xCa1.5xSi11N20O:Ce3+ resulted in a yellow powder with yellow luminescence. Powder X‐ray data were analyzed by Rietveld refinement based on the crystal data obtained from Yb6–xCa1.5xSi11N20O. The Ce3+ doped compound exhibits a broad emission (fwhm ≈ 168 nm/≈ 5100 cm–1) with a maximum at λem ≈ 565 nm. The emission extends more in the red spectral range compared to YAG:Ce3+, thus making it an interesting phosphor for warm‐white single phosphor converted light‐emitting diodes (1pcLED) with an improved color rendering index. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14341948
- Volume :
- 2019
- Issue :
- 47
- Database :
- Academic Search Index
- Journal :
- European Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 140455850
- Full Text :
- https://doi.org/10.1002/ejic.201901206