Abstract Ca2SiO4:Sm3+ phosphors, where CaO and Si2O are synthesized from agricultural waste, are prepared through regular solid state reaction (SSR) technique. The XRD pattern confirmed their monoclinic structure and well matches with ICDD card No. 01-076-3612. The morphological studies through SEM images reveal that these were irregular in size and shape. Decay rates, emission and excitation spectra are measured to estimate the luminescent characteristics of Ca2SiO4:Sm3+ phosphors. The CIE chromaticity values are evaluated and it is shown in reddish-orange region. The luminescence is quenched for doping concentration of above 0.2 mol % of the Sm3+ ion owing to energy transfer through non-radiative process among the Sm3+ ions at different sites. The decay curves are exhibit near single exponential nature for lower (≤0.1 mol %) Sm3+ ion concentrations and turns in to non-exponential nature for higher (≥0.2 mol %) Sm3+ ion concentration. The lifetime values are increasing from 1.67 to 2.28 ms with decrease in concentration of Sm3+ ions from 0.3 to 0.01 mol %. These results suggest that the Ca2SiO4:Sm3+ phosphors were appropriate candidate for low cost white LED applications.

中文翻译：

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利用农业废弃物制备用于白光 LED 应用的新型红橙色发光 Ca2SiO4:Sm3+ 荧光粉

摘要 Ca2SiO4:Sm3+荧光粉以农业废弃物为原料合成CaO和Si2O，采用常规固态反应(SSR)技术制备。XRD 图证实了它们的单斜结构，并且与 ICDD 卡号 01-076-3612 很好地匹配。通过 SEM 图像的形态学研究表明，这些在大小和形状上都是不规则的。测量衰减率、发射和激发光谱以估计 Ca2SiO4:Sm3+ 磷光体的发光特性。评估 CIE 色度值并显示在红橙色区域。由于在不同位置的 Sm3+ 离子之间通过非辐射过程进行能量转移，当掺杂浓度高于 0.2 mol% 的 Sm3+ 离子时，发光被淬灭。对于较低的 (≤0. 1 mol %) Sm3+ 离子浓度并在更高 (≥0.2 mol %) Sm3+ 离子浓度时变为非指数性质。随着 Sm3+ 离子浓度从 0.3 mol % 降低到 0.01 mol %，寿命值从 1.67 ms 增加到 2.28 ms。这些结果表明 Ca2SiO4:Sm3+ 荧光粉是低成本白光 LED 应用的合适候选者。