Unveiling the photoluminescence mechanisms of carbon dots through tunable near-infrared dual-wavelength lasing

IF 17.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Matter Pub Date : 2024-10-02 DOI:10.1016/j.matt.2024.06.011

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引用次数: 0

Abstract

Multi-wavelength lasers are urgently required for integrated multi-channel optoelectronic applications. Carbon dots (CDs) show promise as laser devices due to their multiple photoluminescence centers, modifiable structure, and exceptional gain performance. In this study, we achieved reversible switchable dual-wavelength laser emission in the near-infrared (NIR) regions using o-phenylenediamine (OPD)-derived CDs with fine-tuning capabilities through concentration or pH regulation. Additionally, by comparing the laser properties of its fluorophore 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP), we established a model for the CDs. DHQP confined on the surface of CDs provides aggregation sites, conjugated carbon nuclei promote multiple scattering and enhance light amplification, and whole CDs exhibit a cross-linked confined enhanced emission effect with higher photoluminescence (PL) quantum yield (PLQY), more stable laser emission, and lower laser threshold. This study not only offers valuable insights into the PL mechanisms of CDs but also demonstrates a promising direction for rational design of tunable multi-wavelength laser gain materials.

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通过可调近红外双波长激光揭示碳点的光致发光机制

集成多通道光电应用迫切需要多波长激光器。碳点（CD）具有多个光致发光中心、可修改的结构和优异的增益性能，因此有望成为激光器件。在这项研究中，我们利用邻苯二胺（OPD）衍生的碳点实现了近红外（NIR）区域可逆切换的双波长激光发射，并通过浓度或 pH 值调节实现了微调功能。此外，通过比较其荧光体 5,14-二氢喹喔啉并[2,3-b]吩嗪（DHQP）的激光特性，我们建立了一个光盘模型。局限在 CD 表面的 DHQP 提供了聚集位点，共轭碳核促进了多重散射并增强了光放大，整个 CD 表现出交联局限增强发射效应，具有更高的光致发光量子产率（PLQY）、更稳定的激光发射和更低的激光阈值。这项研究不仅为深入了解 CD 的光致发光机理提供了宝贵的见解，而且为合理设计可调谐多波长激光增益材料指明了方向。

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

Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

26.30

自引率

2.60%

发文量

367

期刊介绍： Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content. Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.