Temperature-Dependent Luminescence Characteristic of SrSi2O2N2:Eu2+ Phosphor and Its Thermal Quenching Behavior
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第3期
论文作者：Jinlan Qin Chaofan Hu Bingfu Lei Jinfang Li Yingliang Liu Shuiping Ye Miaozhu Pan
文章页码：290 - 294
摘 要：The yellow SrSi2O2N2:Eu2+ phosphor has been synthesized by using a simple solid-state reaction method with Srt2SiO4:Eu2 as the precursor. It shows a broad excitation band extending from 250 to 520 nm and an asymmetric emission band with a main peak at about 550 nm. The emission intensity of the SrSi22O2N2:Eut is about 1.2 times higher than the commercial yellow phosphor YAG:Ce3+（P46-Y3）. The temperaturedependent luminescence characteristic of SrSi22O2N2:Euthas been investigated in this paper. With increasing temperature, the emission band of SrSi2O2N2:Eu2+ shows anomalous blue-shift along with decreasing emission intensity and the broadening full width at half maximum（FWHM）. Particularly, compared with YAG:Ce3t（P46-Y3）, the yellow SrSi2O2N2:Eu2+ phosphors exhibit higher thermal stability due to their weaker electron-phonon coupling strength（1.1）, lower stokes shift（0.0576 eV） and larger activation energy（0.288 eV）. All these results indicate that SrSi2O2N2:Eu2+ yellow phosphors have potential application for white light-emitting diodes（LEDs）. What’s more, an energy level scheme is constructed to explain the anomalous blue-shift phenomenon.
Jinlan Qin1，Chaofan Hu1，Bingfu Lei2，Jinfang Li1，Yingliang Liu2，Shuiping Ye2，Miaozhu Pan2
1. Department of Chemistry, Jinan University2. College of Science, South China Agricultural University
摘 要：The yellow SrSi2O2N2:Eu2+ phosphor has been synthesized by using a simple solid-state reaction method with Srt2SiO4:Eu2 as the precursor. It shows a broad excitation band extending from 250 to 520 nm and an asymmetric emission band with a main peak at about 550 nm. The emission intensity of the SrSi22O2N2:Eut is about 1.2 times higher than the commercial yellow phosphor YAG:Ce3+（P46-Y3）. The temperaturedependent luminescence characteristic of SrSi22O2N2:Euthas been investigated in this paper. With increasing temperature, the emission band of SrSi2O2N2:Eu2+ shows anomalous blue-shift along with decreasing emission intensity and the broadening full width at half maximum（FWHM）. Particularly, compared with YAG:Ce3t（P46-Y3）, the yellow SrSi2O2N2:Eu2+ phosphors exhibit higher thermal stability due to their weaker electron-phonon coupling strength（1.1）, lower stokes shift（0.0576 eV） and larger activation energy（0.288 eV）. All these results indicate that SrSi2O2N2:Eu2+ yellow phosphors have potential application for white light-emitting diodes（LEDs）. What’s more, an energy level scheme is constructed to explain the anomalous blue-shift phenomenon.
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