固态氮掺杂碳量子点发射增强的电化学控制,Nanoscale

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固态氮掺杂碳量子点发射增强的电化学控制
Nanoscale ( IF 5.8 ) Pub Date : 2022-10-05 , DOI: 10.1039/d2nr03691f
Yihuai Huang ₁ , Bo Huang ₁ , Huichao Zhang ₁ , Xinmiao Lu ₁ , Yu Zhang ₁ , Xiumin Gao ₂ , Songlin Zhuang ₂

Affiliation

由于其优异的光学和电学性能，掺杂碳量子点（CQD）有望用于新型薄膜光电器件，如发光二极管和太阳能电池。然而，这些设备的进步目前受到固态薄膜中掺杂 CQD 难以捉摸的光物理过程的阻碍。在这里，使用光谱电化学 (SEC) 方法研究了氮掺杂 CQD (N-CQD) 薄膜的光学特性。观察到独特的光致发光 (PL) 增强现象，其中 N-CQD 薄膜的 PL 强度可以在正电化学电位扫描和负电化学电位扫描中增加。正电位对 PL 增强的影响更大（+1.4 V 时～340%），而负电位的作用稍弱（-1.4 V 时～10%）。据我们所知，以往SEC对各种QD的研究都没有报道过类似的增亮过程，其中发射强度最多只能在正电位或负电位下表现出增强。我们提出上述PL增亮与电化学电荷注入后π-π堆积效应减弱有关，氮掺杂在其中起着至关重要的作用。最后，通过用氩气鼓泡增加电解质流动性以减少局部电荷聚集，可以实现 PL 光谱的低滞后可逆电化学调节。我们提出上述PL增亮与电化学电荷注入后π-π堆积效应减弱有关，氮掺杂在其中起着至关重要的作用。最后，通过用氩气鼓泡增加电解质流动性以减少局部电荷聚集，可以实现 PL 光谱的低滞后可逆电化学调节。我们提出上述PL增亮与电化学电荷注入后π-π堆积效应减弱有关，氮掺杂在其中起着至关重要的作用。最后，通过用氩气鼓泡增加电解质流动性以减少局部电荷聚集，可以实现 PL 光谱的低滞后可逆电化学调节。

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Electrochemical control of emission enhancement in solid-state nitrogen-doped carbon quantum dots

Because of their excellent optical and electrical properties, doped carbon quantum dots (CQDs) are expected to be used in novel film optoelectronic devices such as light-emitting diodes and solar cells. However, these device advancements are currently hindered by the elusive photophysical process of doped CQDs in solid-state films. Here, the optical properties of nitrogen-doped CQD (N-CQD) films are studied using spectro-electrochemical (SEC) methods. A distinctive photoluminescence (PL) enhancement phenomenon is observed, in which the PL intensity of the N-CQD film can be increased in both positive and negative electrochemical potential sweeps. The effect of positive potential on PL enhancement is greater (∼340% at +1.4 V), while that of negative potential is slightly weaker (∼10% at −1.4 V). To the best of our knowledge, no similar brightening process has been reported in all previous SEC studies on a variety of QDs, wherein the emission intensity can only exhibit enhancement under positive or negative potential at most. We propose that the above PL brightening is related to the weakened π–π stacking effect after electrochemical charge injection and nitrogen doping plays a crucial role in it. Finally, a low hysteresis reversible electrochemistry regulation of the PL spectrum can be achieved by increasing electrolyte fluidity with argon gas bubbling to reduce local charge aggregation.

更新日期：2022-10-05

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