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Yellow phosphors coated with TiO_2 for the enhancement of photoluminescence and thermal stability

机译：涂有TiO_2的黄色荧光粉可增强光致发光和热稳定性

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摘要

In order to improve the phosphor ethciency of yellow emission of the phosphor-converted white light emitting diode (pcW-LED), the Ba~(2+) Mg~(2+) co-doped Sr_2SiO_4:Eu phosphors were synthesized and were coated with thin and uniform TiO_2. The TiO_2 layer with 20 nm was uniformly coated over the phosphor surface. The photoluminescence (PL) properties of the TiO_2-coated phosphors showed improved yellow-emission intensity compared to the pristine phosphors. The temperature dependence of photoluminescence was measured from 25 to 150℃. The TiO_2-coated phosphors showed superior thermal quenching property compared to pristine phosphors. We concluded that the TiO_2-coated surface of the phosphor is an effective way to improve the phosphor efficiency and enhance the thermal quenching stability.
机译：为了提高荧光粉转换后的白光发光二极管（pcW-LED）黄色发射的荧光粉的发光效率，合成了Ba〜（2+）Mg〜（2+）共掺杂的Sr_2SiO_4：Eu荧光粉并进行了涂层处理。均匀且均匀的TiO_2将20nm的TiO_2层均匀地涂覆在荧光粉表面上。与原始磷光体相比，TiO_2涂覆的磷光体的光致发光（PL）性能显示出改善的黄光发射强度。在25至150℃范围内测量光致发光的温度依赖性。与原始磷光体相比，涂覆TiO_2的磷光体显示出优异的热猝灭性能。我们得出的结论是，磷光体的TiO_2涂层表面是提高磷光体效率和增强热猝灭稳定性的有效方法。

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  • 来源
    《Applied Surface Science》 |2011年第20期|p.8355-8359|共5页
  • 作者

    Hyeong Seok Lee; Jung Whan Yoo;

  • 作者单位

    Composite Materials Center, Korea Institute of Ceramic Engineering and Technology, 233-5, Gasan-Dong, Geumcheon-Gu, Seoul, 153-801, Republic of Korea,Department of Chemical Engineering, Hanyang University, Haengdang-dong, Seongdong-Gu, Seoul, 133-791, Republic of Korea;

    Composite Materials Center, Korea Institute of Ceramic Engineering and Technology, 233-5, Gasan-Dong, Geumcheon-Gu, Seoul, 153-801, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phosphor; TiO_2 coating; thermal stability; surface modification;

    机译：磷;TiO_2涂层;热稳定性;表面改性;

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