Strong quantum-confined excitation and emission from violet phosphorus quantum dots

Strong quantum-confined excitation and emission from violet phosphorus quantum dots
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紫磷量子点的强量子限制激发和发射

DOI:
10.1063/5.0089468
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发表时间:
2022-04
影响因子:
4
通讯作者:
X. L. Wu
X. L. Wu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Y. W. Zhan;K. Yan;J. H. Wu;H. G. Zhu;J. Chen;S. L. Tang;Z. Y. Zhang;X. L. Wu

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紫磷(VP)作为一种新型的二维半导体材料,近年来在光电子领域的应用引起了人们的广泛关注。虽然机械剥离已用于制备VP纳米带或纳米片,但高量子产率VP量子点(VPQD)的生产仍然是一个挑战。在本文中,VPQD通过在乙醇中的液体剥离和随后在180 °C下在二甲基甲酰胺中的溶剂热处理来制备。所制备的VPQDs平均粒径约为2 nm,在乙醇溶液中交换后可发出较强的蓝色光致发光。量子产率可达8.6%。这种强的光致发光是由量子限域效应引起的带-带复合和P-O-C表面成键态共同作用的结果。此外,VPQDs溶液在环境条件下具有良好的光稳定性,这表明它们在荧光生物成像和光催化反应中可能具有潜力。
As a new type of two-dimensional semiconductor material, violet phosphorus (VP) has recently attracted much attention for applications in the field of optoelectronics. Although mechanical exfoliation has been used to prepare VP nanoribbons or nanosheets, production of the high quantum yield VP quantum dots (VPQDs) remains a challenge. Herein, the VPQDs are prepared via liquid exfoliation in ethanol and subsequent solvothermal treatment under 180 °C in dimethylformamide. The prepared VPQDs have a mean size of about 2 nm and can emit a strong blue photoluminescence (PL) when exchanged in ethanol solution. The quantum yield can reach 8.6%. The strong PL arises from both the band-to-band recombination related to quantum confinement effects and P-O-C related surface bonding state. Furthermore, the VPQDs solution has a good photostability under ambient conditions, suggesting their possible potential in fluorescent biological imaging and photocatalytic reactions.
DOI: 10.1002/anie.196610473
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