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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Tunable green to yellowish-orange phosphor Na3LuSi2O7:Eu2+, Mn2+ via energy transfer for UV-LEDs
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Tunable green to yellowish-orange phosphor Na3LuSi2O7:Eu2+, Mn2+ via energy transfer for UV-LEDs

机译：可通过能量转移将可调谐的绿色至淡橙色橙色荧光粉Na3LuSi2O7：Eu2 +，Mn2 +传递给UV-LED

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摘要

A series of Eu2+, Mn2+-doped Na3LuSi2O7 (NLSO) phosphors have been prepared via the high-temperature solid-state reaction route. X-ray diffraction (XRD), Raman and Fourier transform infrared (FT-IR) spectra, fluorescent decay times, photoluminescence (PL) including temperature-dependent PL properties and scanning electron microscopy (SEM) were used to characterize the as-prepared samples. In Eu2+ singly-doped NLSO samples, an intense green emission is presented under UV excitation. A tunable color from green to yellowish-orange was generated when Mn2+ ions were co-doped into the NLSO: Eu2+, which is based on the energy transfer from Eu2+ to Mn2+ ions. The energy transfer from Eu2+ to Mn2+ ions can be speculated to be due to the wide spectral overlap between the Eu2+ emission and Mn2+ excitation spectra in Eu2+ or Mn2+ singly-doped NLSO samples. This is demonstrated by the similar excitation spectra of the Eu2+ and Mn2+ emission bands and the decreases in Eu2+ emission intensity and decay lifetime with the increase of Mn2+ concentration in the NLSO: Eu2+, Mn2+ samples. The energy transfer mechanism from Eu2+ to Mn2+ ions was determined to be a dipole-quadrupole interaction by the concentration quenching and spectral overlap methods. The maximum quantum yield can reach 51.5% for NLSO: 0.01Eu(2+), 0.12Mn(2+). The above results indicate that NLSO: Eu2+, Mn2+ could be a candidate as a green to yellowish-orange component for UV-excited w-LEDs.
机译：通过高温固态反应路线制备了一系列Eu2 +，Mn2 +掺杂的Na3LuSi2O7（NLSO）荧光粉。使用X射线衍射（XRD），拉曼和傅立叶变换红外（FT-IR）光谱，荧光衰减时间，包括取决于温度的PL特性的光致发光（PL）和扫描电子显微镜（SEM）来表征制备的样品。在Eu2 +单掺杂NLSO样品中，在紫外线激发下呈现强烈的绿色发射。当将Mn2 +离子共掺杂到NLSO：Eu2 +中时，会产生从绿色到淡橙色的可调颜色，其基于从Eu2 +到Mn2 +离子的能量转移。可以推测，从Eu2 +到Mn2 +离子的能量转移是由于Eu2 +或Mn2 +单掺杂NLSO样品中Eu2 +发射光谱与Mn2 +激发光谱之间的宽光谱重叠。 Eu2 +和Mn2 +发射带的激发光谱相似，随着NLSO：Eu2 +，Mn2 +样品中Mn2 +浓度的增加，Eu2 +发射强度和衰变寿命降低，证明了这一点。通过浓度猝灭和光谱重叠法确定了从Eu2 +到Mn2 +离子的能量转移机理是偶极-四极相互作用。 NLSO的最大量子产率可以达到51.5％：0.01Eu（2 +），0.12Mn（2+）。以上结果表明，NLSO：Eu2 +，Mn2 +可能是紫外线激发的w-LEDs的绿色至淡橙色的成分的候选物。

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