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首页> 外文期刊>RSC Advances >Cathodoluminescence of Y2O3: Ln(3+) (Ln = Tb, Er and Tm) and Y2O3: Bi3+ nanocrystalline particles at 200 keV
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Cathodoluminescence of Y2O3: Ln(3+) (Ln = Tb, Er and Tm) and Y2O3: Bi3+ nanocrystalline particles at 200 keV

机译：Y2O3：LN（3+）（LN = TB，ER和TM）和Y2O3：BI3 +纳米晶颗粒的阴极发光，200keV

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摘要

The cathodoluminescence (CL) spectra of nanocrystalline Y2O3: Tb3+ (0.3%), Y2O3: Er3+ (1%), Y2O3: Tm3+ (2%) and Y2O3: Bi3+ (1%) were recorded in a transmission electron microscope at 200 keV, low current density and various temperatures. The quenching energy of the intrinsic luminescence of the various Y2O3: Ln3+ (Ln 1/4 Tb, Er and Tm) phosphors was found to be 0.25 eV. The intrinsic luminescence and the strongest spectral transitions of Ln(3+) in these three phosphors exhibit similar temperature behaviour at temperatures -50 degrees C, viz. a small increase of the spectral radiance upon increasing the temperature. Increasing the temperature beyond -50 degrees C led to complete quenching of the intrinsic luminescence at room temperature, whereas the radiance of the Ln(3+) spectral transitions only decreased slightly. An extended Jablonski diagram for the energy transfer from the self-trapped exciton states in Y2O3 to the Ln3+ and Bi3+ ions is proposed. This diagram also indicates why Tb3+ is a better quencher of the intrinsic luminescence in Y2O3 than Er3+ and Tm3+. The intrinsic luminescence of Y2O3: Bi3+ largely overlapped with the blue Bi3+ emission band, which made an accurate analysis of its temperature behaviour impossible. Nevertheless, we concluded that upon increasing the temperature energy from Bi3+ ions at the C-3i sites is transferred to Bi3+ ions at C-2 sites. From the temperature behaviour of the 539 nm transition of the H-2(11/2) - I-4(15/2) manifold of Y2O3: Er3+ the activation energy for this transition could be determined: viz. 0.078 eV (623 cm(-1)).
机译：纳米晶Y2O3的阴极发光（CL）光谱：Tb3 +的（0.3％），Y 2 O 3：铒（1％），Y 2 O 3：TM3 +（2％）和Y 2 O 3：Bi 3+的（1％），在200千电子伏被记录在透射型电子显微镜，低电流密度和不同的温度下。各种Y2O3的固有发光的淬火能量：镧系（LN 1/4铽，Er和Tm）的磷光体被发现是0.25 eV的。自发光并在这些三种磷光体LN（3+）的最强的光谱显示出转变在温度＆GT类似的温度特性; -50℃，即光谱辐射亮度的时提高温度的少量增加。增大到超过导致在室温下的固有发光的完全骤冷-50摄氏度的温度，而Ln的辐射（3+）光谱仅过渡略有下降。提出了一种用于从自陷激子状态中的Y2O3能量传递给稀土离子和Bi 3+的离子的扩展雅布隆斯基图。该图还表明为什么铽是Y2O3自发光比Er3 +离子和TM3 +更好的猝灭剂。 Y2O3的固有发光：Bi 3+的与蓝色BI3 +发射带，这使得它的温度特性的精确分析不可能在很大程度上重叠。然而，我们的结论是，当在C-3I站点从BI3 +离子增加温度能量在C-2位点转移到BI3 +离子。从H-2（11/2）的539纳米过渡的温度行为 - ＆GT; I-4（15/2）歧管的Y2O3：Er3 +离子用于此转变的活化能可确定：即0.078电子伏（623厘米（-1））。

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  • 来源
    《RSC Advances》 |2018年第1期|共10页
  • 作者

    den Engelsen Daniel; Fern George R.; Ireland Terry G.; Silver Jack;

  • 作者单位

    Brunel Univ London Wolfson Ctr Mat Proc Ctr Phosphor &

    Display Mat Uxbridge UB8 3PH Middx England;

    Brunel Univ London Wolfson Ctr Mat Proc Ctr Phosphor &

    Display Mat Uxbridge UB8 3PH Middx England;

    Brunel Univ London Wolfson Ctr Mat Proc Ctr Phosphor &

    Display Mat Uxbridge UB8 3PH Middx England;

    Brunel Univ London Wolfson Ctr Mat Proc Ctr Phosphor &

    Display Mat Uxbridge UB8 3PH Middx England;

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