黑龙江大学许辉团队报道了具有累积输出的氧化膦- Nd³⁺配位链实现高效LED泵浦光放大。相关研究成果于2024年6月13日发表于国际顶尖学术期刊《美国化学会杂志》。

近红外发光稀土有机配合物在光波导放大领域引起了人们的广泛关注。然而，由于掺杂浓度有限，它们的光学增益通常小于4dB/cm。

该文开发了两个由氧化膦配体桥接的一维（1D）Nd³⁺配位链，即 [Nd(TTA)₃(DBTDPO)]n (Nd₁)和 [Nd(TTA)₃(DPEPO)]_n (Nd₂)，用于掺钕波导放大器。尽管DPEPO的P–P距离与DBTDPO相似，但与Nd₁相比，DPEPO不同的PÉO取向使Nd₂的链内和链间Nd–Nd距离明显更短。此外，较弱的分子间相互作用减轻了Nd₂的猝灭效应。因此，Nd₂可以提供更多的局部集中和辐射Nd³⁺离子，导致比Nd₁更大的Nd³⁺特性1.06μm的发射强度和持续时间。

基于嵌入式和倏逝场波导结构，Nd₂实现了5.7和4.9dB/cm的最先进增益最大值以及出色的增益稳定性。这些结果表明，镧系离子在多维上的可控配位组装，为结合局部高密度输出和有效抑制猝灭提供了一种灵活的方法。

附：英文原文

Title: Phosphine Oxide-Nd3+ Coordination Chains with Cumulated Output Enable Efficient LED-Pumping Optical Amplification

Author: Yi Man, Xiaowu Shi, Yan He, Chunbo Duan, Chunmiao Han, Dan Zhang, Hui Xu

Issue&Volume: June 13, 2024

Abstract: Near-infrared luminescent rare-earth organic complexes have attracted intensive attention in the field of optical waveguide amplification. However, their optical gains were commonly less than 4 dB/cm due to limited doping concentrations. Herein, two one-dimensional (1D) Nd3+ coordination chains, namely, [Nd(TTA)3(DBTDPO)]n (Nd1) and [Nd(TTA)3(DPEPO)]n (Nd2), bridged by phosphine oxide ligands were developed for the neodymium-doped waveguide amplifier. Despite its P–P distance being similar to DBTDPO, the different P═O orientation of DPEPO renders markedly shorter intra- and interchain Nd–Nd distances for Nd2 in comparison to Nd1. Furthermore, the weaker intermolecular interactions alleviate the quenching effect for Nd2. Therefore, Nd2 can provide more locally concentrated and radiative Nd3+ ions, leading to a larger Nd3+-characteristic 1.06 μm emission intensity and duration than Nd1. Based on embedded and evanescent-field waveguide structures, Nd2 achieves state-of-the-art gain maxima of 5.7 and 4.9 dB/cm as well as outstanding gain stability. These results indicate that controllable coordination assembly of lanthanide ions in multidimension provides a flexible approach to combine local high-density outputs and effective suppression of quenching.

DOI: 10.1021/jacs.4c02735

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c02735