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1. 北京有色金属研究总院 稀土材料国家工程研究中心 北京,100088
2. 有研稀土新材料股份有限公司 北京,100088
纸质出版日期:2015-4-3,
收稿日期:2015-1-5,
修回日期:2015-2-9,
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陈磊, 刘荣辉, 庄卫东等. Eu<sup>2+</sup>浓度对Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup>红粉热猝灭机制的影响[J]. 发光学报, 2015,36(4): 371-376
CHEN Lei, LIU Rong-hui, ZHUANG Wei-dong etc. Effect of Eu<sup>2+</sup> Concentration on The Thermal Quenching Mechanism of Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup> Red Phosphors[J]. Chinese Journal of Luminescence, 2015,36(4): 371-376
陈磊, 刘荣辉, 庄卫东等. Eu<sup>2+</sup>浓度对Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup>红粉热猝灭机制的影响[J]. 发光学报, 2015,36(4): 371-376 DOI: 10.3788/fgxb20153604.0371.
CHEN Lei, LIU Rong-hui, ZHUANG Wei-dong etc. Effect of Eu<sup>2+</sup> Concentration on The Thermal Quenching Mechanism of Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup> Red Phosphors[J]. Chinese Journal of Luminescence, 2015,36(4): 371-376 DOI: 10.3788/fgxb20153604.0371.
采用高温固相法制备了不同Eu
2+
浓度掺杂的Sr
2
Si
5
N
8
红色荧光粉
并对其晶体结构、形貌、发光和热猝灭性能进行了详细的研究。XRD和SEM测试表明
所合成的样品为纯相Sr
2
Si
5
N
8
结构
具有较高的结晶度。PL光谱数据表明
Eu
2+
替代Sr
2+
格位形成两种不同的发光中心。温度特性测试发现
样品的热猝灭性能很大程度上取决于Eu
2+
浓度。随着Eu
2+
浓度的增加
样品的热猝灭性能先增强后降低。不同发光中心的荧光强度比和荧光寿命测试结果表明:在较低Eu
2+
掺杂条件下
Eu
2+
浓度引起热猝灭性能改变的机制主要归因于Eu
2+
占据不同Sr
2+
格位的几率的改变。
Eu
2+
doped Sr
2
Si
5
N
8
red phosphors with different Eu
2+
concentration were synthesized by high-temperature solid state method. The crystal structure
morphology
luminescence and thermal quenching properties were investigated in detail. X-ray diffraction (XRD) patterns show that a pure phase of Sr
2
Si
5
N
8
phosphor with high crystallinity has been obtained. Photoluminescence (PL) spectra results indicate that there are two different luminescence centers when Eu
2+
ions substitute Sr
2+
sites. Thermal stability data show that the thermal quenching property is largely dependent on Eu
2+
concentration. The changes of relative intensity ratio and fluorescence lifetime were examined for the two-peak emission in Sr
2
Si
5
N
8
:Eu
2+
. The results reveal that Eu
2+
distribution changes with varying Eu
2+
concentration
which should be the mainly mechanism of the thermal quenching behavior for Eu
2+
doped Sr
2
Si
5
N
8
phosphors at low dopant levels.
Sr2Si5N8荧光粉热猝灭荧光寿命
Sr2Si5N8phosphorthermal quenchingfluorescence lifetime
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Pimputkar S, Speck J S, Den Baars S P, et al. Prospects for LED lighting [J]. Nat. Photon., 2009, 3(4):179-181.
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Piao X, Machida K, Horikawa T, et al. Acetate reduction synthesis of Sr2Si5N8:Eu2+ phosphor and its luminescence properties [J]. J. Lumin., 2010, 130(1):8-12.
Li Y Q, De With G, Hintzen H T. The effect of replacement of Sr by Ca on the structural and luminescence properties of the red-emitting Sr2Si5N8:Eu2+ LED conversion phosphor [J]. J. Solid State Chem., 2008, 181(3):515-524.
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Tian Y C. Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs [J]. J. Solid State Lighting, 2014, 1:11-25.
Bachmann V, Rondam C, Meijerink A. Temperature quenching of yellow Ce3+ luminescence in YAG:Ce [J]. Chem. Mater., 2009, 21(10):2077-2084.
Hu Y S, Zhuang W D, He H Q, et al. High temperature stability of Eu2+ -activated nitride red phosphors [J]. J. Rare Earths (稀土学报), 2014, 32(1):12-16 (in Chinese).
Piao X, Horikawa T, Hanzawa H, et al. Characterization and luminescence properties of Sr2Si5N8:Eu2+ phosphor for white light-emitting-diode illumination [J]. Appl. Phys. Lett., 2006, 88:161908-1-3.
Sohn K S, Lee S, Xie R J, et al. Rate-equation model for energy transfer between activators at different crystallographic sites in Sr2Si5N8:Eu2+ [J]. Opt. Lett., 2009, 34(21):3427-3429.
Ma X L, Zhuang W D, Guo H J, et al. Influence of Ca for Sr substitution on luminescence properties of Sr3Al0.6Si0.4O4.4-F0.6:Ce3+ phosphors [J]. Chin. J. Lumin.(发光学报), 2014, 35(5):519-525 (in Chinese).
Wang C, Zhao Z Y, Wu Q S, et al. The pure-phase Ba3-xCaxSi6O12N2:Eu2+ green phosphor: Synthesis, photoluminescence and thermal properties [J]. Cryst. Eng. Comm., 2014, 16:9651-9656.
Piao X, Horikawa T, Hanzawa H, et al. Preparation of (Sr1-xCax)2Si5N8/Eu2+ solid solutions and their luminescence properties [J]. J. Electrochem. Soc., 2006, 153(12):H232-H235.
Piao X, Machida K, Horikawa T, et al. Self-propagating high temperature synthesis of yellow-emitting Ba2Si5N8:Eu2+ phosphors for white light-emitting diodes [J]. Appl. Phys. Lett., 2007, 91(4):041908-1-3.
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