NDLI: A novel Eu2+ activated G-La2Si2O7 phosphor for white LEDs: SiC-reduction synthesis, tunable luminescence and good thermal stability

Content Provider	Royal Society of Chemistry (RSC)
Author	Wan, Jieqiong Liu, Qian Zhou, Zhenzhen Liu, Guanghui Ni, Jia Xie, Rong-Jun
Copyright Year	2017
Abstract	A new Eu2+ activated, G-type La2Si2O7 phosphor was synthesized successfully via a novel SiC-reduction route. The valence state of the Eu2+ ions was identified with XRD and XPS analysis and the luminescence spectrum presented Eu2+ broad bands. The G-La2Si2O7:Eu2+ (LPS:Eu2+) phosphor exhibited tunable emission colors depending on the excitation wavelength or the Eu concentration, enabling the production of white light. The color tunable property is ascribed to the component ratio of the two specific luminescent centers, Eu(1) and Eu(2). Eu2+ ions prefer to occupy the La3+ crystallographic sites selectively, which was identified by electron paramagnetic resonance (EPR) spectroscopy. Furthermore, the relative emission intensity of the phosphor at 100 °C and 160 °C can maintain 89% and 76% of the value measured at room temperature, which is much better than that of most of Eu2+ doped silicon oxides phosphors. The Eu(1) emission possesses a better fluorescence thermal stability than the Eu(2) emission, and an energy transition from Eu(1) to Eu(2) occurs. This better thermal stability and energy transition have been explained by the schematic configuration coordination. A w-LED device was fabricated by combining the prepared La2Si2O7:Eu2+ and commercial BaMgAl10O17:Eu2+ phosphors with a 365 nm n-UV chip. The w-LED device generates white light (color rendering index Ra = 93.9), and its CIE chromaticity coordinates and correlated color temperature (CCT) are (x, y) = (0.3429, 0.3523) and 5090 K, respectively. These results suggest that LPS:Eu2+ has a great potential for use in UV-LED-driven white emitting diodes.
Starting Page	1614
Ending Page	1623
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	5
Issue Number	7
Journal	Journal of Materials Chemistry C
DOI	10.1039/c6tc04835h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	EPR Eu Stellar classification X-ray crystallography Luminescence Wavelength Electron paramagnetic resonance Spectroscopy Emission intensity Fluorescence Energiewende in Germany Radium International Commission on Illumination Chromaticity Color temperature
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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