Intense Red Fluorescence From Surface Traps in BaSO4:V5+, Eu3+ and Its Applications

IF 3.2 4区化学 Q2 CHEMISTRY, ANALYTICAL

Luminescence Pub Date : 2024-11-24 DOI:10.1002/bio.70035

S. Varalakshmi, Arunachalam Lakshmanan, L. Sangeetha, V. Rathinamala

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Abstract

BaSO₄:V⁵⁺ synthesized at 1000°C in air exhibits an intense emission band peaking at 495 nm from surface traps assisted by atmospheric oxygen on excitation at 350 nm due to charge transfer from O²⁻ to V⁵⁺ in the (VO₄)³⁻ tetrahedral complex. BaSO₄:Eu synthesized under similar conditions exhibits both Eu²⁺ (375 nm) and Eu³⁺ (619 nm) fluorescence. Vanadium codoping quenches the Eu²⁺ fluorescence but enhances the Eu³⁺ fluorescence in BaSO₄:V, Eu due to charge compensation. However, Eu codoping quenches the vanadium fluorescence by diffusion of vanadium into the crystal, and V₂O₅ also serves as a flux enhancing Eu³⁺ doping efficiency in BaSO₄ lattice. The 619nm Eu³⁺ PL emission intensity in BaSO₄:V⁵⁺, Eu³⁺ is comparable to 592nm emission from commercial (Y,Gd) BO₃:Eu³⁺. However, V⁵⁺ emission shows strong thermal quenching, while Eu³⁺ emission shows little thermal quenching up to 210°C, making BaSO₄:V⁵⁺, Eu³⁺ a promising new red phosphor for improving the color rendering of blue light-based white LED. The ratio of Eu³⁺ to V⁵⁺ fluorescence increases with excitation temperature (30°C°C–180°C) enabling BaSO₄:V⁵⁺, Eu³⁺ to be used as a non-contact luminescence thermometer.

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来自 BaSO4:V5+, Eu3+ 表面陷阱的强红色荧光及其应用

在 1000°C 的空气中合成的 BaSO4:V5+，在 350 纳米波长的激发波长下，由于 (VO4)3- 四面体复合物中的电荷从 O2- 转移到 V5+，在大气氧的辅助下产生了表面陷阱，从而在 495 纳米波长处显示出峰值的高强度发射带。在类似条件下合成的 BaSO4:Eu 同时显示出 Eu2+ （375 纳米）和 Eu3+ （619 纳米）荧光。在 BaSO4:V, Eu 中，由于电荷补偿作用，掺钒淬灭了 Eu2+ 的荧光，但增强了 Eu3+ 的荧光。然而，Eu 共掺会通过钒向晶体中的扩散而熄灭钒荧光，V2O5 还可作为一种通量，提高 Eu3+ 在 BaSO4 晶格中的掺杂效率。BaSO4:V5+, Eu3+ 的 619nm Eu3+ PL 发射强度与商用 (Y,Gd) BO3:Eu3+ 的 592nm 发射强度相当。然而，V5+ 发光显示出强烈的热淬火，而 Eu3+ 发光在 210°C 以下几乎没有热淬火，这使得 BaSO4:V5+, Eu3+ 成为一种很有前途的新型红色荧光粉，可用于改善基于蓝光的白光 LED 的显色性。Eu3+ 与 V5+ 的荧光比值随激发温度（30°C°C-180°C）的升高而增加，因此 BaSO4:V5+, Eu3+ 可用作非接触式发光温度计。

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来源期刊

Luminescence 生物-生化与分子生物学

CiteScore

5.10

自引率

13.80%

发文量

248

审稿时长

3.5 months

期刊介绍： Luminescence provides a forum for the publication of original scientific papers, short communications, technical notes and reviews on fundamental and applied aspects of all forms of luminescence, including bioluminescence, chemiluminescence, electrochemiluminescence, sonoluminescence, triboluminescence, fluorescence, time-resolved fluorescence and phosphorescence. Luminescence publishes papers on assays and analytical methods, instrumentation, mechanistic and synthetic studies, basic biology and chemistry. Luminescence also publishes details of forthcoming meetings, information on new products, and book reviews. A special feature of the Journal is surveys of the recent literature on selected topics in luminescence.