Temperature and Eu<sup>2+</sup>-Doping Induced Phase
Selection in NaAlSiO<sub>4</sub> Polymorphs and the Controlled Yellow/Blue
Emission
Ming Zhao
Zhiguo Xia
Maxim S. Molokeev
Lixin Ning
Quanlin Liu
10.1021/acs.chemmater.7b02548.s003
https://acs.figshare.com/articles/dataset/Temperature_and_Eu_sup_2_sup_-Doping_Induced_Phase_Selection_in_NaAlSiO_sub_4_sub_Polymorphs_and_the_Controlled_Yellow_Blue_Emission/5231677
The 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 Eu<sup>2+</sup>-doping content induced phase selection and variations
of the local structures in nepheline, low-carnegieite and high-carnegieite
types of NaAlSiO<sub>4</sub> polymorphs were studied in detail. The
luminescence of Eu<sup>2+</sup> 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 Eu<sup>2+</sup>-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.
2017-07-07 00:00:00
high-carnegieite types
doping concentration
NaAlSiO 4 polymorphs
phase selection
broad-band emissions
low-carnegieite
theory calculations
doping content
NaAlSiO 4 Polymorphs
synthesis temperatures
near-ultraviolet excitation
Eu
light-emitting diode device
temperature-dependent phase transition
properties optimization
coordination structures
Doping Induced Phase Selection
nm
Debye temperature
photoluminescence evolution
chemical compositions
nepheline phases
synthesis temperature