新型发光 Eu3+-吡啶-2,6-二羧酸络合物的分离策略，具有高相容性和稳定性，适用于光转换农膜,Materials Chemistry Frontiers

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新型发光 Eu3+-吡啶-2,6-二羧酸络合物的分离策略，具有高相容性和稳定性，适用于光转换农膜
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2022-11-16 , DOI: 10.1039/d2qm01035f
Maolin Zhang ₁ , Chipeng Zhao ₁ , Ji-Qing Song ₁ , Wen-Qing He ₁ , Peiyi Zhao ₂ , Jialei Liu ₁

Affiliation

基于有机共轭小分子的稀土配合物是一种很有前途的光转换材料，用于温室薄膜以提高作物产量。不幸的是，在薄膜中实现这种具有低迁移率的光转换材料的高发光性能仍然是一个很大的挑战。据预测，增加发光复合物与聚合物主链之间的相互作用可以降低复合物的迁移率。^{在此，我们桥接了两个与 Eu 3+}配位的吡啶-2,6-二羧酸衍生物使用不同长度的烷基链的发光中心。然后，制备了两种新的光转换剂LDPA-4（四个碳原子）和LDPA-6（六个碳原子）。使用这种策略，我们实现了 LDPA-6 的 615 nm 红光发射量子产率 (QY) 为 13.16%，远高于 LDPA-4 (5.28%) 和参考样品 LCA-C (10.77%) ），分别。在得到的光转化膜中，LDPF-6处理的油菜样品在试验田施用期间表现出最大的生长速率和产量，达到2482.8 kg ha ^-1，是纯PE的1.15倍，显示出特殊的吡啶-2,6-二羧酸的配体效应和两个发光中心之间烷基链长度的重要性。

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Isolation strategy for a novel luminescent Eu3+-pyridine-2,6-dicarboxylic acid complex with high compatibility and stability for light-conversion agricultural films

Small organic conjugated molecule-based rare earth complexes are a kind of promising light-conversion material used in greenhouse films to improve the crop yield. Unfortunately, achieving a high luminescent performance of this kind of light-conversion material with a low migration rate in the film is still a big challenge. It has been predicted that increasing the interaction between the luminescent complex and polymer backbone could reduce the migration rate of the complex. Herein, we bridged two pyridine-2,6-dicarboxylic acid derivatives coordinated to Eu³⁺ luminescent centers using different lengths of the alkyl chain. Then, two new light-conversion agents, LDPA-4 (four carbon atoms) and LDPA-6 (six carbon atoms), were prepared. Using this strategy, we achieved a 615 nm red-light emission quantum yield (QY) of 13.16% for LDPA-6, which was much higher than that of LDPA-4 (5.28%) and the reference sample LCA-C (10.77%), respectively. In the resulting light-conversion films, rape samples treated with LDPF-6 exhibited the largest growth rate and yield of 2482.8 kg ha⁻¹ during the experimental plot application, which was 1.15 times higher than that of the pure PE one, demonstrating the special ligand effect of the pyridine-2,6-dicarboxylic acid and the importance of the alkyl chain length between the two luminescent centers.

更新日期：2022-11-16

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