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首页> 外文期刊>RSC Advances >Cathodoluminescence of Y2O3:Ln3+ (Ln = Tb, Er and Tm) and Y2O3:Bi3+ nanocrystalline particles at 200 keV
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Cathodoluminescence of Y2O3:Ln3+ (Ln = Tb, Er and Tm) and Y2O3:Bi3+ nanocrystalline particles at 200 keV

机译：Y 2 O 3 ：Ln 3 + （Ln = Tb，Er和Tm）和Y 2 的阴极发光200 keV的O 3 ：Bi 3 + 纳米晶体颗粒

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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 = Tb, Er and Tm) phosphors was found to be 0.25 eV. The intrinsic luminescence and the strongest spectral transitions of Ln3+ in these three phosphors exhibit similar temperature behaviour at temperatures > ?50 °C, viz. a small increase of the spectral radiance upon increasing the temperature. Increasing the temperature beyond ?50 °C led to complete quenching of the intrinsic luminescence at room temperature, whereas the radiance of the Ln3+ 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 C3i sites is transferred to Bi3+ ions at C2 sites. From the temperature behaviour of the 539 nm transition of the 2H11/2 → 4I15/2 manifold of Y2O3:Er3+ the activation energy for this transition could be determined: viz. 0.078 eV (623 cm?1).
机译：纳米晶体Y 2 O 3 ：Tb 3+的阴极发光（CL）光谱 （0.3％），Y 2 O 3 ：Er 3 + （1％），Y 2 O 3 ：Tm 3 + （2％）和Y 2 O 3 ：Bi 3 + （1％）在透射电子显微镜中以200 keV，低电流密度和各种温度记录。各种Y 2 O 3 ：Ln 的本征发光的猝灭能量发现3 + （Ln = Tb，Er和Tm）荧光粉为0.25 eV。这三种荧光粉中的Ln 3 + 的本征发光和最强光谱跃迁在> 50°C的温度下表现出相似的温度行为。 >随着温度升高，光谱辐射率略有增加。将温度升高到超过50°C会导致室温下本征发光的完全淬灭，而Ln 3 + 光谱跃迁的辐射仅略有下降。能量从Y 2 O 3 的自陷激子态到能量转移的扩展Jablonski图提出了Ln 3 + 和Bi 3 + 离子的方法。该图还说明了为什么Tb 3 + 是Y 2 O 3 比Er 3 + 和Tm 3 + 小。 Y 2 O 3 ：Bi 3 + 的固有发光与蓝色Bi 3 + 发射带在很大程度上重叠，这使得无法准确分析其温度行为。尽管如此，我们得出的结论是，随着温度的升高，来自C 3i 位的Bi 3 + 离子的能量转移到C 2 位置的Bi 3 + 离子。从 2 H 11/2 → 2 O 的> 4 I 15/2 流形 3 ：Er 3 + 可以确定此过渡的激活能： viz。 0.078 eV（623 cm ？1 ）。

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