Synthesis, structural characterization and intense far-red luminescence of Mn4+ -activated SrLaMgTa1-yAlyO6 oxide phosphors

IF 3.3 3区 物理与天体物理 Q2 OPTICS
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引用次数: 0

Abstract

The transition metal Mn4+ activated phosphors have attracted increasing attention due to the potential uses in phosphor-converted lighting emitting diodes (LEDs). Herein, the far-red emitting SrLaMgTa1-yAlyO6:Mn4+ (y = 0−0.15) oxide phosphors were successfully synthesized by the high-temperature solid state reaction, in which the Mn4+ acted as an activator. The monoclinic double perovskite crystal structure, chemical composition, and 4+ state of activator Mn were confirmed by means of X-ray diffraction Rietveld refinement, scanning electron microscopy elemental mapping, and X-ray photoelectron spectroscopy. The optical properties were characterized with photoluminescence excitation and emission spectra, temperature-dependent emission spectra, and electroluminescence spectra. The excitation spectra are interweaved with the ligand-to-metal charge transfer band of Mn−O and intrinsic transitions (4A2g4T1g, 4A2g2T2g, and 4A2g4T2g) of Mn4+, locating at the ultraviolet and blue light region. The emission spectra mainly contain a dominant far-red emission band from 650 to 775 nm with peaks at 695 and 708 nm, which are ascribed to the 2Eg4A2g transition of Mn4+. Moreover, the cationic substitution strategy with tiny Al3+ occupying Ta5+ octahedral site, promotes the improvement of luminescence intensity and optical thermal stability. The quantum yield of optimal phosphor reaches 88.2 % and the fluorescence intensity at 373 K (100 °C) retains 83.4 % in respect to that at ambient temperature, implying the phosphor with intense and thermally stable luminescence. The phosphor is packaged with 365 nm chip to fabricate an LED device, and the electroluminescence result is quite consistent with the photoluminescence, matching well with the absorption spectrum of the phytochrome. The Mn4+ activated oxide phosphors with intense far-red emission are promising for plant cultivation lighting.

Mn4+ 激活的 SrLaMgTa1-yAlyO6 氧化物荧光粉的合成、结构表征和强烈的远红发光特性
过渡金属 Mn4+ 活化荧光粉在荧光粉转换照明发光二极管(LED)中的潜在用途引起了越来越多的关注。本文以 Mn4+ 为活化剂,通过高温固态反应成功合成了 SrLaMgTa1-yAlyO6:Mn4+ (y = 0-0.15) 氧化物荧光粉。通过 X 射线衍射 Rietveld 精炼、扫描电子显微镜元素图谱和 X 射线光电子能谱分析,确认了单斜双包晶石晶体结构、化学成分和活化剂 Mn 的 4+ 状态。通过光致发光激发光谱和发射光谱、随温度变化的发射光谱以及电致发光光谱对其光学特性进行了表征。激发光谱与 Mn-O 的配体-金属电荷转移带和 Mn4+ 的本征跃迁(4A2g→4T1g、4A2g→2T2g 和 4A2g→4T2g)交织在一起,位于紫外和蓝光区域。其发射光谱主要包含 650 至 775 nm 的远红外发射带,在 695 和 708 nm 处有峰值,这是由于 Mn4+ 的 2Eg→4A2g 转变所致。此外,以微小的 Al3+ 占据 Ta5+ 八面体位点的阳离子取代策略促进了发光强度和光热稳定性的提高。最佳荧光粉的量子产率达到了 88.2%,在 373 K(100 °C)下的荧光强度与环境温度下的荧光强度相比保持了 83.4%,这意味着该荧光粉具有强烈的热稳定性发光特性。将该荧光粉与 365 nm 芯片封装在一起制成了 LED 器件,电致发光结果与光致发光结果相当一致,与植物色素的吸收光谱非常吻合。Mn4+ 活化的氧化物荧光粉具有强烈的远红外发射,有望用于植物栽培照明。
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来源期刊
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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