Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting.

IF 3.5 3区医学 Q2 CHEMISTRY, MEDICINAL

ACS Medicinal Chemistry Letters Pub Date : 2024-09-20 DOI:10.1038/s41377-024-01607-x

Ming Zhao,Yeping Ge,Yurong Li,Xiaoyan Song,Zhiguo Xia,Xinping Zhang

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Abstract

Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources, and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield (PLQY). However, the constraint of concentration quenching poses a great challenge for improving the PLQY. Herein, we propose a fundamental design principle by separating activators and prolonging their distance in Eu2+-activated Rb3Y(PO4)2 phosphors to inhibit concentration quenching, in which different quenching rates are controlled by the Eu distribution at various crystallographic sites. The blue-violet-emitting Rb3Y(PO4)2:xEu (x = 0.1%-15%) phosphors, with the occupation of Rb1, Rb2 and Y sites by Eu2+, exhibit rapid luminescence quenching with optimum external PLQY of 10% due to multi-channel energy migration. Interestingly, as the Eu concentration increases above 20%, Eu2+ prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances, resulting in green emission with suppressed concentration quenching, achieving an improved external PLQY of 41%. Our study provides a unique design perspective for elevating the efficiency of Eu2+-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

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用于全光谱照明的 Eu2+ 激活型 Rb3Y(PO4)2 荧光粉中的抑制浓度淬灭和可调光致发光。

高效无机荧光粉是发光二极管光源的理想选择，而提高活化剂的掺杂浓度是提高光致发光量子产率（PLQY）的常用方法。然而，浓度淬灭的限制给提高光致发光量子产率带来了巨大挑战。在此，我们提出了一种基本设计原理，即在 Eu2+ 激活的 Rb3Y(PO4)2 磷光体中分离激活剂并延长其距离以抑制浓度淬灭，其中不同的淬灭速率受不同晶体学位点的 Eu 分布控制。蓝紫色发光的 Rb3Y(PO4)2:xEu (x = 0.1%-15%) 磷光体的 Rb1、Rb2 和 Y 位点被 Eu2+ 占据，由于多通道能量迁移，这些磷光体表现出快速的发光淬灭，最佳外部 PLQY 为 10%。有趣的是，当 Eu 浓度增加到 20% 以上时，Eu2+ 更倾向于占据具有分离多面体和大离子间距的 Rb1 和 Y 位点，从而在抑制浓度淬灭的同时发出绿色荧光，外部 PLQY 提高到 41%。我们的研究为提高 Eu2+ 激活荧光粉的效率提供了一个独特的设计视角，使其成为用于全光谱照明的高性能无机发光材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Medicinal Chemistry Letters CHEMISTRY, MEDICINAL-

CiteScore

7.30

自引率

2.40%

发文量

328

审稿时长

1 months

期刊介绍： ACS Medicinal Chemistry Letters is interested in receiving manuscripts that discuss various aspects of medicinal chemistry. The journal will publish studies that pertain to a broad range of subject matter, including compound design and optimization, biological evaluation, drug delivery, imaging agents, and pharmacology of both small and large bioactive molecules. Specific areas include but are not limited to: Identification, synthesis, and optimization of lead biologically active molecules and drugs (small molecules and biologics) Biological characterization of new molecular entities in the context of drug discovery Computational, cheminformatics, and structural studies for the identification or SAR analysis of bioactive molecules, ligands and their targets, etc. Novel and improved methodologies, including radiation biochemistry, with broad application to medicinal chemistry Discovery technologies for biologically active molecules from both synthetic and natural (plant and other) sources Pharmacokinetic/pharmacodynamic studies that address mechanisms underlying drug disposition and response Pharmacogenetic and pharmacogenomic studies used to enhance drug design and the translation of medicinal chemistry into the clinic Mechanistic drug metabolism and regulation of metabolic enzyme gene expression Chemistry patents relevant to the medicinal chemistry field.