Blue lasers using low-toxicity colloidal quantum dots

IF 38.1 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xuyang Lin, Yang Yang, Xueyang Li, Yongshun Lv, Zhaolong Wang, Jun Du, Xiaohan Luo, Dongjian Zhou, Chunlei Xiao, Kaifeng Wu
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引用次数: 0

Abstract

Blue lasers play a pivotal role in laser-based display, printing, manufacturing, data recording and medical technologies. Colloidal quantum dots (QDs) are solution-grown materials with strong, tunable emission covering the whole visible spectrum, but the development of QD lasers has largely relied on Cd-containing red-emitting QDs, with technologically viable blue QD lasers remaining out of reach. Here we report on the realization of tunable and robust lasing using low-toxicity blue-emitting ZnSe–ZnS core–shell QDs that are compact in size yet still feature suppressed Auger recombination and long optical gain lifetime approaching 1 ns. These characteristics allow us to handle the blue QDs like laser dyes for liquid-state amplified spontaneous emission and lasing. The blue QD laser is operated under quasi-continuous-wave excitation by solid-state nanosecond lasers. A Littrow-configuration cavity enables narrow linewidth (<0.2 nm), wavelength-tunable, coherent and stable laser outputs without circulating the solution. These results indicate the promise of ZnSe–ZnS QDs to fill the ‘blue gap’ of QD lasers and to replace less stable blue laser dyes for a multitude of applications.

Abstract Image

使用低毒胶体量子点的蓝光激光器
蓝光激光器在基于激光的显示、印刷、制造、数据记录和医疗技术中发挥着举足轻重的作用。胶体量子点(QDs)是一种溶液生长材料,具有覆盖整个可见光谱的强可调谐发射,但 QD 激光器的开发主要依赖于含 Cd 的红色发射 QDs,技术上可行的蓝色 QD 激光器仍然遥不可及。在此,我们报告了利用低毒性蓝色发光 ZnSe-ZnS 核壳 QD 实现可调谐和稳健激光的情况,这些 QD 体积小巧,但仍具有抑制奥杰尔重组和接近 1 ns 的长光学增益寿命的特点。这些特性使我们能够像处理激光染料一样处理蓝色 QD,以实现液态放大自发辐射和激光。蓝色 QD 激光器是在固态纳秒激光器的准连续波激励下运行的。利特罗配置的腔体可实现窄线宽(0.2 纳米)、波长可调、相干和稳定的激光输出,而无需循环溶液。这些结果表明,ZnSe-ZnS QDs 有希望填补 QD 激光器的 "蓝色空白",并在多种应用中取代稳定性较差的蓝色激光染料。
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来源期刊
Nature nanotechnology
Nature nanotechnology 工程技术-材料科学:综合
CiteScore
59.70
自引率
0.80%
发文量
196
审稿时长
4-8 weeks
期刊介绍: Nature Nanotechnology is a prestigious journal that publishes high-quality papers in various areas of nanoscience and nanotechnology. The journal focuses on the design, characterization, and production of structures, devices, and systems that manipulate and control materials at atomic, molecular, and macromolecular scales. It encompasses both bottom-up and top-down approaches, as well as their combinations. Furthermore, Nature Nanotechnology fosters the exchange of ideas among researchers from diverse disciplines such as chemistry, physics, material science, biomedical research, engineering, and more. It promotes collaboration at the forefront of this multidisciplinary field. The journal covers a wide range of topics, from fundamental research in physics, chemistry, and biology, including computational work and simulations, to the development of innovative devices and technologies for various industrial sectors such as information technology, medicine, manufacturing, high-performance materials, energy, and environmental technologies. It includes coverage of organic, inorganic, and hybrid materials.
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