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Journal of Materials Chemistry C Vol - 4 Issue - 39

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K₈Nb₇P₇O₃₉: a new type of complicated incommensurately modulated structure and photoluminescence properties of Eu³⁺-doped solid solutions

Content Provider	Royal Society of Chemistry (RSC)
Author	Cui, Jun-Yan Zhao, Dan Han, Hong-Xian Li, Can
Copyright Year	2016
Abstract	A new type of potassium niobium phosphate, K8Nb7P7O39, has been prepared and its structure has been determined by single crystal X-ray diffraction analysis. The results show that it crystallizes in a novel (3 + 1)-dimensional incommensurately modulated structure with a triclinic superspace group P(αβγ)0 and modulation vector q = −0.35281a* + 0.17630b* + 0.25807c*. The structure of K8Nb7P7O39 contains [K3.66]∞, [K4.34]∞ and [Nb7P7O39]∞ layers alternately stacked along the c-axis. In this structure, seven not fully occupied K atoms (six of them come from the [K3.66]∞ layer and the remaining one comes from the [K4.34]∞ layer) are thought to be the dominant factors in driving the structural modulation. The strong occupational modulation in combination with positional modulation of these seven K atoms can be described by crenel-type modulation functions. Furthermore, elemental composition, UV-Vis absorption spectrum, SEM morphology and photoluminescence properties induced by Eu3+-doping have been studied for K8Nb7P7O39. The excitation spectrum covers a wide range from 362 to 465 nm and it matches well with the emission of near-UV InGaN-based LED chips and bluish-green LED chips, indicating that K8Nb7P7O39:Eu3+ has potential as a red-emitting phosphor for LED applications.
Starting Page	11436
Ending Page	11448
Page Count	13
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	4
Issue Number	48
Journal	Journal of Materials Chemistry C
DOI	10.1039/c6tc03022j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Potassium Niobium Phosphate X-ray crystallography Triclinic crystal system Superspace Euclidean vector Absorption spectroscopy Photoluminescence Dopant
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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