通过可控的裂变-聚合策略合成紫外光到蓝光发射的硫纳米点

Tunable ultraviolet to deep blue light emission from sulfur nanodots fabricated by a controllable fission-aggregation strategy

本文通过可控的裂变-聚合策略合成紫外光到蓝光发射的硫纳米点,实现了在短波长范围内的荧光发射,其最高的荧光量子产率可达59.4%.由于其独特的裂变-聚合生成机理,这种合成方法能控制硫纳米点的尺寸(3.2–5.6 nm),因此可实现从紫外到深蓝色(342–430 nm)可调谐发光,并抑制非辐射复合中心的生成以及深能级发射.通过光谱表征和理论计算探究了硫纳米点的发光机理和量子限域效应.研究结果表明了硫纳米点在紫外光电子学、生物医学治疗和杀菌等应用领域的可能性.

Bright tunable light emission in the short wavelength range from sulfur nanodots was demonstrated with a photoluminescence quantum yield(PLQY)of up to 59.4%.A fission-aggregation mechanism was proposed for the formation of sulfur nanodots with desired performances.This synthetic strategy allowed for simultaneous size control from 3.2 to 5.6 nm,thus tuning the emission color from ultraviolet(UV)to deep blue(342±430 nm),and for the suppression of unwanted nonradiative recombination centers and deep level emission.The luminescence mechanism and quantum confinement effect of the synthesized sulfur nanodots were investigated by optical spectroscopy and theoretical calculations.These results show promise toward the application of sulfur nanodots in UV optoelectronics,biomedical treatments,and sterilization.