用于植物栽培的新型 Y3+ 改性 La3Li5Sb2O12:Mn4+ 远红外石榴石荧光粉

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-04-11 DOI:10.1016/j.jlumin.2025.121244

Chao Hu , Lan Luo , Rui Guo , Ziying Ma , Ye Liu

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引用次数: 0

摘要

Mn4+活性远红发光石榴石荧光粉具有良好的化学/物理稳定性和与光敏色素吸收相匹配的发射带，在植物栽培中具有广泛的应用前景。采用固相反应法制备了（La1-xYx）3Li5Sb2O12: Mn4+(x = 0 ~ 0.4)石榴石荧光粉。该粉体具有以717 nm为中心的远红发光（与Mn4+ 2Eg→4A2g跃迁有关），最高发光量子效率（QE）和热猝灭温度（T0.5）分别达到38.03%和520 K。与La3Li5Sb2O12:Mn4+相比，性能得到了显著改善，QE提高了一倍，T0.5时提高了20 K。Y3+阳离子取代会导致更强的晶体场（通过Dq/B计算验证）和更小的自旋轨道耦合（通过EPR谱验证），并导致较小的2Eg能级的能量分裂和质心移动。从而大大提高了发光效率和热稳定性。这项工作不仅提供了一种新的远红发光荧光粉，而且为Mn4+活性发光材料的改进提供了策略。

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A novel Y3+ modified La3Li5Sb2O12:Mn4+ far-red-emitting garnet phosphor for plant cultivation

Mn⁴⁺-active far-red emitting garnet phosphors are attractive in plant cultivation for chemical/physical stability and emission band well matching with the phytochrome absorption. (La_1-xY_x)₃Li₅Sb₂O₁₂: Mn⁴⁺(x = 0∼0.4) garnet phosphors were fabricated by solid-state reaction in this work. The powder could exhibit far-red emission centered around 717 nm (related to Mn⁴⁺ ²E_g→⁴A_2g transition), with the highest luminescence quantum efficiency (QE) and thermal quenching temperature (T₀.₅) reaching 38.03 % and 520 K, respectively. Comparing with La₃Li₅Sb₂O₁₂:Mn⁴⁺, the properties have been improved significantly, with double in QE and 20 K higher in T_0.5. Y³⁺ cation substitution would lead a stronger crystal field (verified by D_q/B calculation) and a less spin-orbit coupling (verified by EPR spectra), and result in a smaller energy splitting and centroid shifting in ²E_g level. Then the luminescent efficiency and thermal stability would be improved a lot. The work not only provides a new far-red-emitting phosphor but also offers a strategy for Mn⁴⁺ -active luminescence material improvement.

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来源期刊

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.