Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs

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

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.261

Huanzhuo Gao , Balaji Devakumar , Xiaoyong Huang

{"title":"Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs","authors":"Huanzhuo Gao , Balaji Devakumar , Xiaoyong Huang","doi":"10.1016/j.ceramint.2024.12.261","DOIUrl":null,"url":null,"abstract":"<div><div>Transition metal Cr3+ ions doped near-infrared (NIR) emitting phosphors have bright application prospects in plant growth LEDs. Herein, we report on the synthesis, crystal structure, morphology, luminescence properties and thermal stability of Cr3+ doped Ca2AlNbO6 NIR-emitting double-perovskite phosphors. The Ca2AlNbO6 host belongs to the monoclinic system, and its band gap is determined to be 4.02 eV. In Ca2AlNbO6:Cr3+ phosphors, the Cr3+ ion replaces the Al3+ site of the distorted octahedron and it experiences a strong crystal field environment with Dq/B value of 2.7. Upon 337 nm excitation, the optimal Ca2AlNbO6:0.2%Cr3+ phosphor produces a narrow NIR band peaking at 744 nm corresponding to the 2Eg → 4A2g transition of Cr3+ ion, and its internal quantum efficiency reaches 32.6%. There is a large spectral overlap between the emission spectrum of Ca2AlNbO6:0.2%Cr3+ phosphor and the absorption spectrum of phytochrome PFR, so Ca2AlNbO6:Cr3+ phosphor can be used for indoor plant lighting. The concentration quenching mechanism is found to be dipole-dipole interaction. Additionally, the decay lifetimes of Ca2AlNbO6:Cr3+ phosphors are located within the range of from 2.117 to 3.245 ms. Furthermore, the thermal stability of Ca2AlNbO6:0.2%Cr3+ is studied through temperature-dependent emission spectra, and its integrated emission intensity at 423 K is 54% of that at 303 K.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8321-8328"},"PeriodicalIF":5.1000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0272884224059194","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

Transition metal Cr³⁺ ions doped near-infrared (NIR) emitting phosphors have bright application prospects in plant growth LEDs. Herein, we report on the synthesis, crystal structure, morphology, luminescence properties and thermal stability of Cr³⁺ doped Ca₂AlNbO₆ NIR-emitting double-perovskite phosphors. The Ca₂AlNbO₆ host belongs to the monoclinic system, and its band gap is determined to be 4.02 eV. In Ca₂AlNbO₆:Cr³⁺ phosphors, the Cr³⁺ ion replaces the Al³⁺ site of the distorted octahedron and it experiences a strong crystal field environment with D_q/B value of 2.7. Upon 337 nm excitation, the optimal Ca₂AlNbO₆:0.2%Cr³⁺ phosphor produces a narrow NIR band peaking at 744 nm corresponding to the ²E_g → ⁴A_2g transition of Cr³⁺ ion, and its internal quantum efficiency reaches 32.6%. There is a large spectral overlap between the emission spectrum of Ca₂AlNbO₆:0.2%Cr³⁺ phosphor and the absorption spectrum of phytochrome P_FR, so Ca₂AlNbO₆:Cr³⁺ phosphor can be used for indoor plant lighting. The concentration quenching mechanism is found to be dipole-dipole interaction. Additionally, the decay lifetimes of Ca₂AlNbO₆:Cr³⁺ phosphors are located within the range of from 2.117 to 3.245 ms. Furthermore, the thermal stability of Ca₂AlNbO₆:0.2%Cr³⁺ is studied through temperature-dependent emission spectra, and its integrated emission intensity at 423 K is 54% of that at 303 K.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.