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首页> 外文期刊>RSC Advances >Tunable white-light emission via energy transfer in single-phase LiGd(WO4)(2):Re3+ (Re = Tm, Tb, Dy, Eu) phosphors for UV-excited WLEDs
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Tunable white-light emission via energy transfer in single-phase LiGd(WO4)(2):Re3+ (Re = Tm, Tb, Dy, Eu) phosphors for UV-excited WLEDs

机译：通过单相LiGD（WO4）（2）（2）中的能量转移可调谐白光发射（2）：RE3 +（RE = TM，TB，DY，EU）磷光体用于UV兴奋的WLEDS

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摘要

A series of novel single-phase color tunable LiGd(WO4)(2)(LGW): Re3+ (Re = Tm, Tb, Dy, Eu) phosphors have been synthesized by a solid-state reaction. X-ray diffraction (XRD), FT-IR, photoluminescence (PL) and fluorescence decay curves were utilized to characterize the as-prepared samples. Under the excitation of UV light, LGW: Tm3+, LGW: Tb3+, LGW: Dy3+ and LGW: Eu3+ exhibit the characteristic emissions of Tm3+ (blue), Tb3+ (green), Dy3+ (yellow) and Eu3+ (red), respectively. On the one hand, by simply adjusting the doping concentration of Eu3+ ions in the LGW: 2% Tm3+, 4% Tb3+, x% Eu3+ system, a white emission in a single-phase was achieved by blending simultaneously the blue, green, and red emissions of Tm3+, Tb3+, and Eu3+ ions in the LGW host, in which the energy transfer from Tb3+ to Eu3+ ions was found to play an important role. On the other hand, a white emission can also be realized based on the energy transfer from Tm3+ to Dy3+ ions in the LGW: 2% Tm3+, x% Dy3+ system. The energy transfer mechanism from Tm3+ to Dy3+ ions has been demonstrated to be through dipole-quadrupole interaction and the critical distance (RTm-Dy) calculated by the concentration quenching method is 16.03 angstrom. The PL properties of as-prepared materials indicate that LGW: Re3+ (Re = Tm, Tb, Dy, Eu) may be potentially applied as single-phase white-light-emitting phosphors for UV-excited WLEDs.
机译：通过固态反应合成了一系列新型单相色调Ligd（WO4）（2）（2）（LgW）：Re3 +（Re = Tm，Tb，Dy，Eu）磷光体。利用X射线衍射（XRD），FT-IR，光致发光（PL）和荧光衰减曲线来表征以制备的样品。在UV光的激发下，LGW：TM3 +，LGW：TB3 +，LGW：DY3 +和LGW：EU3 +分别表现出TM3 +（蓝色），TB3 +（绿色），DY3 +（黄色）和EU3 +（红色）的特征排放。一方面，通过简单地调节LgW中的EU3 +离子的掺杂浓度：2％Tm3 +，4％Tb​​3 +，X％Eu3 +系统，通过同时混合蓝色，绿色和均匀来实现单相中的白色发射在LGW宿主中的TM3 +，TB3 +和Eu3 +离子的红色排放，其中发现从TB3 +到Eu3 +离子的能量转移起到重要作用。另一方面，也可以基于LGW中的TM3 +至DY3 +离子的能量转移来实现白色发射：2％TM3 +，X％DY3 +系统。已经证明了来自TM3 +至DY3 +离子的能量转移机制是通过偶极 - 四极相互作用和通过浓缩淬火方法计算的临界距离（RTM-DY）是16.03埃。制备的材料的PL性能表明LGW：RE3 +（RE = TM，TB，Dy，EU）可以潜在地应用于用于UV兴奋的WLED的单相白光磷光体。

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  • 来源
    《RSC Advances》 |2015年第117期|共9页
  • 作者

    Zhang Yang; Gong Weitao; Yu Jingjie; Lin Yuan; Ning Guiling;

  • 作者单位

    Dalian Univ Technol State Key Lab Fine Chem Dalian 116012 Peoples R China;

    Dalian Univ Technol State Key Lab Fine Chem Dalian 116012 Peoples R China;

    Dalian Polytech Univ Res Inst Photon Dalian 116034 Peoples R China;

    Dalian Univ Technol State Key Lab Fine Chem Dalian 116012 Peoples R China;

    Dalian Univ Technol State Key Lab Fine Chem Dalian 116012 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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