Temperature-Dependent Luminescence Characteristic of SrSi2O2N2：Eu2＋ Phosphor and Its Thermal Quenching Behavior

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.更多还原