Abstract

Samarium-doped La₂O₃ nanocrystalline powder annealed at different temperatures has been synthesized by a very cost-effective chemical precipitation method. X-ray diffraction, transmission electron microscope, energy-dispersive X-ray (EDAX) attached to scanning electron microscope and photoluminescence spectroscopy (PL) were used to analyse the prepared nanocrystals. Samples were heated at 600 °C, 700 °C and 800 °C to increase crystallinity and observe the particle size effect on the luminescence property. The PL intensity of Sm³⁺ increases with heating from 600 to 800 °C. This is attributed to the increase of Sm³⁺ occupancy in the La³⁺ lattice sites and also the extent of the reduction in the non-radiative transition with the improvement of crystallinity. Emission intensity is found to be maximum at 1 at.% Sm³⁺ doped sample for all heating temperatures. The present material might be a promising phosphor for white light LED application.

中文翻译：

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Sm3+掺杂La2O3纳米颗粒的合成及光致发光性能

摘要

通过一种非常经济有效的化学沉淀方法合成了在不同温度下退火的钐掺杂La ₂ O _{3纳米晶粉末。}使用X射线衍射、透射电子显微镜、扫描电子显微镜附带的能量色散X射线(EDAX)和光致发光光谱(PL)来分析所制备的纳米晶体。将样品加热至600℃、700℃和800℃以增加结晶度并观察粒径对发光性能的影响。^{Sm 3+}的 PL 强度随着从 600 °C 加热到 800 °C 而增加。这归因于La ^{3+晶格位点中Sm 3+}占有率的增加以及随着结晶度的提高非辐射跃迁的减少程度。^{发现在所有加热温度下，1 at.% Sm 3+}掺杂样品的发射强度最大。本材料可能是白光 LED 应用中很有前途的荧光粉。