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Highly Fluorescent and Stable Black Phosphorus Quantum Dots in Water
Small ( IF 13.3 ) Pub Date : 2018-10-11 , DOI: 10.1002/smll.201803132
Liyuan Long 1 , Xianghong Niu 2, 3 , Kun Yan 1 , Gang Zhou 1 , Jinlan Wang 2 , Xinglong Wu 1 , Paul K. Chu 4
Affiliation  

Although 2D black phosphorus (BP) shows excellent optical and electronic properties, there are few reports on the photoluminescence (PL) properties of BP nanostructures because of the low yield of mechanical exfoliation, instability in water, and relatively weak emission. Herein, liquid exfoliation is combined with surface passivation to produce fluorescent BP quantum dots (BPQDs) with a high yield. The BPQDs exhibit strong PL in both ethanol and water and the absolute fluorescent quantum yield in water reaches 70%. Moreover, the BPQD solution exhibits stable PL for 150 d under ambient conditions and better photostability than conventional organic dyes and heavy‐metal semiconducting nanostructures with intense fluorescence. The experiments and theoretical calculation reveal that the intense and stable PL originates from the intrinsic band‐to‐band excitation states and two surface states related to the POH and POCH2CH3 bonding structures introduced by passivation. The polar water molecules remove many nonradiative centers and simultaneously increase the P‐related fluorescent groups on the surface of BPQDs. Therefore, PL from the BPQDs in water is enhanced largely. The excellent fluorescent properties of BPQDs in an aqueous solution bode well for bioimaging and the negligible biotoxicity and distinct cell images suggest large potential in the biomedical and display fields.

中文翻译:

水中高度荧光稳定的黑色磷量子点

尽管二维黑磷(BP)表现出出色的光学和电子性能,但由于机械剥落的产率低,在水中不稳定和相对较弱的发射,有关BP纳米结构的光致发光(PL)性能的报道很少。在本文中,将液体剥离与表面钝化结合以高产率产生荧光BP量子点(BPQD)。BPQD在乙醇和水中均显示出较强的PL,并且水中的绝对荧光量子产率达到70%。此外,与传统的有机染料和具有强荧光的重金属半导体纳米结构相比,BPQD解决方案在环境条件下可稳定稳定地保持150 d的PL,并且具有更好的光稳定性。 OH和P ö CH 2 CH 3的接合结构由钝化引入。极性水分子会去除许多非辐射中心,并同时增加BPQD表面的P相关荧光基团。因此,水中BPQD中的PL大大提高了。水溶液中BPQD的出色荧光性质预示着生物成像的良好前景,并且可忽略的生物毒性和独特的细胞图像表明在生物医学和显示领域具有巨大潜力。
更新日期:2018-10-11
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