Cathodoluminescence of Y2O3: Ln3+ (Ln = Tb, Er and Tm) and Y2O3: Bi3+ nanocrystalline particles at 200 keV

被引:6
作者
den Engelsen, Daniel [1 ]
Fern, George R. [1 ]
Ireland, Terry G. [1 ]
Silver, Jack [1 ]
机构
[1] Brunel Univ London, Wolfson Ctr Mat Proc, Ctr Phosphor & Display Mat, Uxbridge UB8 3PH, Middx, England
基金
英国工程与自然科学研究理事会;
关键词
SYMMETRY-RELATED TRANSITIONS; NANOSIZED CUBIC Y2O3TB3+; DOPED YTTRIUM-OXIDE; ELECTRON-MICROSCOPE; PHOSPHOR PARTICLES; ENERGY-TRANSFER; PHOTOLUMINESCENCE; LUMINESCENCE; SPECTRA; SPECTROSCOPY;
D O I
10.1039/c7ra12644a
中图分类号
O6 [化学];
学科分类号
0703 ;
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)).
引用
收藏
页码:396 / 405
页数:10
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