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

doi:10.1016/j.jmst.2013.08.009

J. Mater. Sci. Technol.

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

Jinlan Qin¹⁾, Chaofan Hu¹⁾, Bingfu Lei²⁾, Jinfang Li¹⁾, Yingliang Liu²⁾, Shuiping Ye²⁾, Miaozhu Pan²⁾

1) Department of Chemistry, Jinan University, Guangzhou 510632, China
2) College of Science, South China Agricultural University, Guangzhou 510642, China

Received:2012-12-18 Revised:2013-01-18 Online:2014-03-15 Published:2014-03-17
Contact: B. Lei
Supported by:
National Natural Science Foundations of China (Nos. 50903038, 21171071, 51203053, and 21071063), the project sponsored by SRF for ROCS, SEM (No. [2011] 1139), and the project of the combination of Industry and Research by the Ministry of Education and Guangdong Province (No.2012B091100181).

Abstract

Abstract:

The yellow SrSi₂O₂N₂:Eu²⁺ phosphor has been synthesized by using a simple solid-state reaction method with Sr₂SiO₄: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 SrSi₂O₂N₂:Eu²⁺ is about 1.2 times higher than the commercial yellow phosphor YAG:Ce³⁺ (P46-Y3). The temperature-dependent luminescence characteristic of SrSi₂O₂N₂:Eu²⁺ has 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:Ce³⁺ (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.

Key words: Phosphor, Luminescence, Thermal quenching

Jinlan Qin, Chaofan Hu, Bingfu Lei, Jinfang Li, Yingliang Liu, Shuiping Ye, Miaozhu Pan. Temperature-Dependent Luminescence Characteristic of SrSi₂O₂N₂:Eu²⁺ Phosphor and Its Thermal Quenching Behavior[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.08.009.

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

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