A novel far-red-emitting phosphor Ca2InTaO6:Mn4+ with excellent responsiveness to phytochrome PFR for plant growth

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-01 DOI:10.1016/j.ceramint.2024.09.429

Shigao Chen , Xuemei Yao , Yue Yang , Ya Yang , Yufeng Du , Yun Cheng , Mohan Yu , Xianchao Du , Huajuan Deng , Ruijin Yu

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Abstract

A series of novel Ca₂InTaO₆ perovskite compounds doped with Mn⁴⁺ ions were successfully synthesized via the conventional solid-state method at elevated temperatures. The X-ray powder diffraction (XRD) technique was utilized to capture the phase structure. Based on the analysis of diffuse reflection (DR) spectra and density functional theory (DFT) calculations, it can be concluded that Ca₂InTaO₆ exhibits characteristics of an indirect semiconductor with a band gap E_g = 3.526 eV. With a 367 nm excitation, the Mn⁴⁺-doped Ca₂InTaO₆ exhibits a far-red emission at 689 nm, corresponding to the ²E_1g to ⁴A_2g transition. The photoluminescence (PL) characteristics of the sample align well with the absorption properties of phytochrome far-red light (P_FR). Based on analysis using the Tanabe-Sugano diagram, it can be inferred that Mn⁴⁺ is situated in a highly intense crystalline field for the ²E_1g state. At concentration x = 0.006, the most optimal Mn⁴⁺ doping was achieved, ascribing to the nearest neighbour ion interaction. The internal quantum efficiency (IQE) is 35.48 %. The Commission International del'Eclairage (CIE) coordinates of a red LED fabricated with Ca₂InTaO₆:0.006Mn⁴⁺ phosphor is located in the red region. Moreover, the electroluminescent spectrum (EL) exhibited by the enclosed lamp has a larger overlapping with the chlorophyll P_FR (85.68 %) than P_R (22.27 %) absorption spectra for promoting plant growth. This study not only provides detailed guidelines for evaluating the practical usability enhancing the P_R to P_FR conversion of Ca₂InTaO₆:0.006Mn⁴⁺, but also presents a thorough examination of the luminescent characteristics demonstrated by the Mn⁴⁺ activators.

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一种新型远红外荧光粉 Ca2InTaO6:Mn4+ 对植物生长所需的植物色素 PFR 具有极佳的响应性

在高温条件下，通过传统固态法成功合成了一系列掺杂 Mn4+ 离子的新型 Ca2InTaO6 包晶化合物。利用 X 射线粉末衍射 (XRD) 技术捕捉了相结构。根据漫反射（DR）光谱分析和密度泛函理论（DFT）计算，可以得出结论：Ca2InTaO6 具有间接半导体的特征，其带隙 Eg = 3.526 eV。在 367 nm 的激发下，掺杂了 Mn4+ 的 Ca2InTaO6 在 689 nm 处显示出远红光发射，对应于 2E1g 到 4A2g 的转变。样品的光致发光（PL）特性与植物色素远红光（PFR）的吸收特性非常吻合。根据 Tanabe-Sugano 图的分析，可以推断出 Mn4+ 位于 2E1g 状态的高强度晶场中。在浓度 x = 0.006 时，Mn4+ 的掺杂达到最佳状态，这归因于近邻离子的相互作用。内部量子效率（IQE）为 35.48%。使用 Ca2InTaO6:0.006Mn4+ 荧光粉制造的红色 LED 的国际照明委员会（CIE）坐标位于红色区域。此外，封闭灯管的电致发光光谱（EL）与促进植物生长的叶绿素吸收光谱（PFR）（85.68%）相比（PR）（22.27%）有更大的重叠。这项研究不仅为评估增强 Ca2InTaO6:0.006Mn4+ 的 PR 向 PFR 转化的实际可用性提供了详细的指导，而且还对 Mn4+ 激活剂所表现出的发光特性进行了深入研究。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.