Emission colour tuning through coupled N/La introduction in Sr2SiO4:Eu2+

被引:12
作者
Black, Ashley P. [1 ]
Denault, Kristin A. [2 ,3 ]
Frontera, Carlos [1 ]
Seshadri, Ram [2 ,3 ]
Goni, Alejandro R. [1 ,4 ]
Fuertes, Amparo [1 ]
机构
[1] CSIC, Inst Ciencia Mat Barcelona ICMAB, Bellaterra 08193, Spain
[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[3] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA
[4] Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain
基金
美国国家科学基金会;
关键词
BOND-VALENCE PARAMETERS; LUMINESCENCE PROPERTIES; OPTICAL-PROPERTIES; RED LUMINESCENCE; PHOSPHORS; TRANSITION; EU2+; OXYNITRIDOSILICATES; FLUORESCENCE; OXYNITRIDES;
D O I
10.1039/c5tc02437d
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The solid solution Sr2-xLaxSiO4-xNx (0 >= x >= 1), obtained by concomitant substitution of Sr2+ by La3+ and O2- by N3- in Sr2SiO4, has been prepared by solid state reaction at 1500 degrees C in N-2/H-2 of mixtures of SrO, La2O3, SiO2 and Si3N4. Synchrotron radiation X-ray diffraction studies show a transition from the monoclinic P2(1)/n symmetry of beta-Sr2SiO4 to orthorhombic Pmnb alpha', beta-K2SO4 type phase for x >= 0.2. The alpha' phase is stabilized as a consequence of the increase in bond valence of the cations induced by nitriding. The activation with Eu2+ and Ce3+ of Sr2-xLaxSiO4-xNx produces luminescent materials with broad emission bands centered up to 650 nm under excitation at 405 nm. The emission wavelengths are tuned by La/N contents in a wide range with emission colours changing from yellow (x = 0.2) to orange-red (x = 1) for Eu2+ phosphors and from blue-green (x = 0.2) to orange-yellow (x = 1) in Ce3+ samples.
引用
收藏
页码:11471 / 11477
页数:7
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