cm7b02548_si_003.cif (6.41 kB)
Temperature and Eu2+-Doping Induced Phase Selection in NaAlSiO4 Polymorphs and the Controlled Yellow/Blue Emission
dataset
posted on 2017-07-07, 00:00 authored by Ming Zhao, Zhiguo Xia, Maxim S. Molokeev, Lixin Ning, Quanlin LiuThe union of temperature-dependent
phase transition and relating
structural transformation via modification of chemical compositions
is of fundamental importance for the discovery of new materials or
their functional properties optimization. Herein, the synthesis temperature
and Eu2+-doping content induced phase selection and variations
of the local structures in nepheline, low-carnegieite and high-carnegieite
types of NaAlSiO4 polymorphs were studied in detail. The
luminescence of Eu2+ in low-carnegieite and nepheline phases
shows blue (460 nm) and yellow (540 nm) broad-band emissions, respectively,
under near-ultraviolet excitation. The photoluminescence evolution
can be triggered by the different synthesis temperatures in relation
to the Eu2+-doping concentration, as corroborated by density
functional theory calculations on the local coordination structures
and corresponding mechanical stabilities in terms of the Debye temperature.
The fabricated white light-emitting diode device with high color rendering
index demonstrates that the multicolor phosphors from one system provides
a new gateway for the photoluminescence tuning.
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high-carnegieite typesdoping concentrationNaAlSiO 4 polymorphsphase selectionbroad-band emissionslow-carnegieitetheory calculationsdoping contentNaAlSiO 4 Polymorphssynthesis temperaturesnear-ultraviolet excitationEulight-emitting diode devicetemperature-dependent phase transitionproperties optimizationcoordination structuresDoping Induced Phase SelectionnmDebye temperaturephotoluminescence evolutionchemical compositionsnepheline phasessynthesis temperature
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