Xiao F, Xue Y N, Zhang Q Y
MOE Key Lab of Specially Functional Materials and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Oct 1;74(2):498-501. doi: 10.1016/j.saa.2009.06.050. Epub 2009 Jul 1.
Y(4)MgSi(3)O(13):Bi(3+), Eu(3+) nanophosphors have been prepared by a facile sol-gel method. The products have been characterized by X-ray diffraction, field-emission scanning electron microscopy and fluorescence measurements. The results show that the nanophosphors are of single phase hexagonal Y(4)MgSi(3)O(13) with size-distribution of 50-90 nm in diameter. White-light emission has been obtained from Bi(3+) and Eu(3+) co-doped Y(4)MgSi(3)O(13) nanophosphors upon excitation of 350 nm ultraviolet light. It is noted that Bi(3+) ions can occupy two different Y(3+) sites and generate different emissions from the (3)p(1) --> (1)s(0) transition. Warm white light has been obtained from Y(4)MgSi(3)O(13):Bi(3+), Eu(3+) nanophosphors according to Commission International de I'Eclairage (CIE) chromaticity coordinates and color temperature (T(c)) with appropriately adjusted contents of Bi(3+) and Eu(3+). The results indicate that Y(4)MgSi(3)O(13):0.08Bi(3+), 0.04Eu(3+) (x = 0.31, y = 0.31, T(c) = 6907 K) are potential nanophosphors for white light-emitting diodes (LEDs) applications.
采用简便的溶胶-凝胶法制备了Y(4)MgSi(3)O(13):Bi(3+), Eu(3+)纳米磷光体。通过X射线衍射、场发射扫描电子显微镜和荧光测量对产物进行了表征。结果表明，该纳米磷光体为单相六方Y(4)MgSi(3)O(13)，直径尺寸分布为50-90nm。在350nm紫外光激发下，Bi(3+)和Eu(3+)共掺杂的Y(4)MgSi(3)O(13)纳米磷光体实现了白光发射。值得注意的是，Bi(3+)离子可占据两个不同的Y(3+)位点，并从(3)p(1)→(1)s(0)跃迁产生不同的发射。根据国际照明委员会（CIE）色度坐标和色温（T(c)），通过适当调整Bi(3+)和Eu(3+)的含量，从Y(4)MgSi(3)O(13):Bi(3+), Eu(3+)纳米磷光体中获得了暖白光。结果表明，Y(4)MgSi(3)O(13):0.08Bi(3+), 0.04Eu(3+)（x = 0.31，y = 0.31，T(c) = 6907K）是用于白光发光二极管（LED）应用的潜在纳米磷光体。
