Photoluminescence Loss and Recovery of α-CsPbI3 Quantum Dots Originated from Chemical Equilibrium Shift of Oleylammonium.,ACS Applied Materials & Interfaces

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Photoluminescence Loss and Recovery of α-CsPbI3 Quantum Dots Originated from Chemical Equilibrium Shift of Oleylammonium.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-02-18 , DOI: 10.1021/acsami.9b23556
Hua Wang ₁ , Xiangtong Zhang ₁ , Ning Sui ₂ , Yue Hu ₃ , Vicki L Colvin ₃ , William W Yu _{2,

4} , Yu Zhang ₁

Affiliation

α-CsPbI3 perovskite quantum dots (PQDs) have great potentials in red-emitting LED and solar cell applications. However, their instability with quick photoluminescence loss with time greatly limits their development. In this study, we found that the nonluminous aged α-CsPbI3 PQDs instantly regained fluorescence emission after a surface treatment with trioctylphosphine. Meanwhile, this surface treatment also worked on fresh α-CsPbI3 PQDs to enhance photoluminescence emission. The structures and compositions of fresh and aged PQDs before and after surface treatment were analyzed in detail. We demonstrated that a surface chemical equilibrium shift mechanism involving oleylammonium led to the PL loss and recovery of α-CsPbI3 PQDs. This chemical equilibrium shift also played an important role in other PQD stabilities against long-term storage, temperature, UV irradiation and ethanol, which were all significantly improved after treatment. The treated α-CsPbI3 PQDs were phase stable for more than 6 months. Oleic acid and oleylamine are common ligands used in PQD syntheses; this study shall promote the understanding of PQD surface chemistry and the preparation of stable α-CsPbI3 PQDs.

中文翻译：

α-CsPbI3量子点的光致发光损失和恢复，其起源于丙烯酰胺的化学平衡位移。

α-CsPbI3钙钛矿量子点（PQD）在发红光的LED和太阳能电池应用中具有巨大的潜力。然而，它们的不稳定性以及随时间的快速光致发光损失极大地限制了它们的发展。在这项研究中，我们发现经过三辛基膦表面处理后，不发光的老化α-CsPbI3PQD立即恢复了荧光发射。同时，这种表面处理也适用于新鲜的α-CsPbI3PQD，以增强光致发光发射。详细分析了表面处理前后新鲜和老化的PQD的结构和组成。我们证明表面化学平衡转移机制涉及回旋铵导致PL损失和α-CsPbI3PQD的恢复。这种化学平衡变化在其他PQD长期存储稳定性中也起着重要作用，温度，紫外线照射和乙醇，处理后均明显改善。处理过的α-CsPbI3PQDs相稳定超过6个月。油酸和油胺是PQD合成中常用的配体。这项研究将促进对PQD表面化学的认识和稳定α-CsPbI3PQD的制备。

更新日期：2020-02-27

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