期刊
CHEMISTRY OF MATERIALS
卷 29, 期 15, 页码 6552-6559出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b02548
关键词
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资金
- National Natural Science Foundation of China [91622125, 51572023, 11574003]
- Natural Science Foundations of Beijing [2172036]
- Fundamental Research Funds for the Central Universities [FRF-TP-16-002A3]
- Special and Excellent Research Fund of Anhui Normal University
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 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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