基于 SiO2-QDs-SiO2 复合纳米结构的过氧化物量子点稳定随机激光器

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-10-16 DOI:10.1016/j.jlumin.2024.120946

Lihua Ye, Shaoqiang Hong, Chunguang Lu, Qing Zhao

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引用次数: 0

摘要

近年来，金属卤化物包晶逐渐成为光电子领域的热点。然而，CsPbX3量子点（QDs）固有的不稳定性严重影响了其放大自发辐射（ASE）或激光性能。在此，我们在掺杂了Ag纳米岛的SiO2-QDs-SiO2（SQS）复合纳米结构中实现了高稳定性的CsPbBr3随机激光。SQS 复合纳米结构产生的强散射和金属银纳米带的局部表面等离子体共振（LSPR）为随机激光的形成提供了光反馈。这样就获得了低阈值（∼2.2 mJ/cm2）的相干随机激光。二氧化硅微球锚定了 QDs，以避免 QDs 簇引起的光诱导再生和荧光淬灭。SQS 内部的 QDs 可有效防止水的侵蚀，从而使样品具有更高的耐水性。加入纯水 40 天后，发光强度仍能保持原来的 70%。我们的研究为提高包晶QDs的水稳定性提供了一种有效的方法。基于包晶量子点薄膜的高稳定性随机激光器在集成光电子学、显示成像和传感测量领域具有广阔的应用前景。

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Stable random laser of perovskite quantum dots based on SiO2-QDs-SiO2 composite nanostructure

In recent years, metal halide perovskite has gradually become a hotspot in the field of optoelectronics. However, the inherent instability of CsPbX₃ quantum dots (QDs) seriously affects the amplified spontaneous emission (ASE) or lasing performance. Herein, the highly stable CsPbBr₃ random laser is realized in SiO₂-QDs-SiO₂ (SQS) composite nanostructure doped with Ag nanoislands. The strong scattering generated by SQS composite nanostructure and the localized surface plasmon resonance (LSPR) of metal silver nanoislands provide optical feedback for the formation of random laser. Then a coherent random laser with low threshold (∼2.2 mJ/cm²) is obtained. SiO₂ microspheres anchor QDs to avoid photoinduced regeneration and fluorescence quenching caused by QDs clusters. The inner QDs of SQS are effectively protected from water erosion, thus resulting that the samples have higher water resistance. The luminescence intensity still maintains 70 % of the original intensity after 40 days with the addition of pure water. Our research provides an effective method for improving the water stability of perovskite QDs. The highly stable random laser based on perovskite quantum dot film has a wide application prospect in integrated optoelectronics, display imaging and sensing measurement.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.