期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 4, 页码 2715-2725出版社
AMER CHEMICAL SOC
DOI: 10.1021/am508859c
关键词
WLEDs; phosphors; crystal-site engineering; structure and property; Rietveld refinement; tunable emission
资金
- National Natural Science Foundation of China [NSFC 91433110, 51472234, 51332008, U1301242]
- National Basic Research Program of China [2010CB327704]
- National Natural Science Foundation of China
- National Natural Science Foundation of Guangdong Province [U1301242]
In this article, Eu-activated CaYAlO4 aluminate phosphors were synthesized by a solid-state reaction. Under UV light excitation, characteristic red line emission of Eu3+ was detected in the range of 570-650 nm. In addition, we introduced crystal-site engineering approach into the CaYAlO4 host through incorporation of Si4+-Ca2+ to replace Al3+-Y3+, which would shrink the AlO6 octahedrons, accompanied by the expansion of CaO9 polyhedron, and then enable the partial reduction of Eu3+ to Eu2+. The crystal structure and underlying mechanism have been clarified on the basis of the Rietveld refinement analysis. The PL spectra of Ca0.99+xY1-xAl1-xSixO4:Eu-0.01 (x = 0-0.30) exhibit both green emission of Eu2+ (4f(6)5d(1)-4f(7), broadband around 503 nm) and red-orange emission of Eu3+ (D-5(0)-F-7(1,2,) 593 and 624 nm) under UV light excitation with a quantum yield of 38.5%. The CIE coordinates of Ca0.99+xY1-xAl1-xSixO4:Eu-0.01 (x = 0-0.30) phosphors are regularly shifted from (0.482, 0.341) to (0.223, 0.457) with increasing x, which would expand the application of Eu. Furthermore, this investigation reveals the correlations of structure and property of luminescent materials, which would shed light on the development of novel phosphors suitable for lighting and display applications.
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