Understanding the role of fuels and impure phases on photoluminescence and thermoluminescence properties of combustion-derived nano Sr2CeO4 blue light-emitting phosphor*,Luminescence

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Understanding the role of fuels and impure phases on photoluminescence and thermoluminescence properties of combustion-derived nano Sr2CeO4 blue light-emitting phosphor*
Luminescence ( IF 3.2 ) Pub Date : 2021-07-26 , DOI: 10.1002/bio.4124
Monika D Lakshmanaiah ₁ , Hari Krishna Rajan ₂ , Chandraprabha M Naganna ₃ , Preetham Raghupathi ₂ , Sivaramakrishna Rajan ₄

Affiliation

Despite great advancements in optical materials and luminescent hosts, self-luminescent blue-emitting phosphors are very limited. In this study we present the influence of fuels used in combustion synthesis on the photoluminescence and thermoluminescence (TL) characteristics of self-luminescent Sr₂CeO₄ blue-emitting phosphors. Four different fuels, oxalyldihydrazide (ODH), sugar, glycine, and ethylenediaminetetraacetic acid, were used to synthesize Sr₂CeO_4. Powder X-ray diffraction patterns showed that pure orthorhombic Sr₂CeO₄ was formed only with the ODH fuel and the other fuels resulted in the formation of impurity phases. Excitation spectra showed peaks at ~290 and 340 nm, corresponding to charge transfer bands from different O₂⁻ to Ce⁴⁺ ions. The emission spectra showed an intense blue-emitting band at 470 nm and the highest emission intensity was found for the sample prepared with ODH. Furthermore, TL glow curves for the γ-irradiated Sr₂CeO₄ nanophosphor showed that ODH as fuel produced a more intense glow curve compared with other fuels investigated. TL glow curve analysis was carried out by calculating parameters such as activation energy, frequency factor, and order of kinetics. This study explores the importance and role of fuel in tuning the optical properties of phosphor hosts.

中文翻译：

了解燃料和不纯相对燃烧衍生的纳米 Sr2CeO4 蓝色发光荧光粉的光致发光和热致发光特性的作用*

尽管在光学材料和发光主体方面取得了巨大进步，但自发光蓝色荧光粉非常有限。在这项研究中，我们展示了燃烧合成中使用的燃料对自发光 Sr ₂ CeO ₄蓝色荧光粉的光致发光和热致发光 (TL) 特性的影响。四种不同的燃料，即草酰二酰肼 (ODH)、糖、甘氨酸和乙二胺四乙酸，用于合成 Sr ₂ CeO _4。粉末 X 射线衍射图显示纯斜方晶系 Sr ₂ CeO ₄仅与 ODH 燃料一起形成，其他燃料导致杂质相的形成。激发光谱显示在~290 和340 nm 处出现峰值，对应于从不同O ₂^-到Ce ⁴⁺离子的电荷转移带。发射光谱在 470 nm 处显示出强烈的蓝色发射带，并且发现用 ODH 制备的样品的发射强度最高。此外，γ 辐照的 Sr ₂ CeO _{4 的}TL 辉光曲线纳米磷光体表明，与其他研究的燃料相比，ODH 作为燃料产生了更强烈的辉光曲线。TL辉光曲线分析通过计算活化能、频率因子和动力学顺序等参数进行。本研究探讨了燃料在调节荧光粉主体光学特性方面的重要性和作用。

更新日期：2021-07-26

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