Room-temperature quaternary alkylammonium passivation toward morphology-controllable CsPbBr3 nanocrystals with excellent luminescence and stability for white LEDs
Room-temperature quaternary alkylammonium passivation toward morphology-controllable CsPbBr3 nanocrystals with excellent luminescence and stability for white LEDs
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室温季烷基铵钝化制备形貌可控的 CsPbBr3 纳米晶体，具有优异的发光性和稳定性，适用于白光 LED
DOI：
10.1016/j.cej.2021.129349
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Y.H. Gao
中科院分区：
文献类型：
--
作者：
L.W. Zhang;W.X. Liang;L. Xu;M. Zhu;X. Wang;J. Su;L.Y. Li;N.S. Liu;Z. Zhang;Y.H. Gao
胶体全无机CsPbX_3（X = Cl，Br，I）钙钛矿纳米晶（PNC）在光电子领域显示出无可比拟的优越性和广阔的应用前景。然而，开发低成本、高质量的PNC是PNC走向商业化的首要任务。在此，我们提出了一种不使用有机极性溶剂的室温烷基季铵（DDAB）钝化策略，通过改进的配体辅助再沉淀法合成了形貌可控的CsPbBr3PNC。表面配体（DDAB和不同链长的有机酸）的量对PNCs的形貌和尺寸有很大影响，导致发射峰发生位移。得益于表面配体的紧密结合，所得CsPbBr3 PNC表现出明亮的绿色发射，具有接近单位的光致发光量子产率（PLQY）和优异的对水和空气的稳定性。超快瞬态吸收光谱和时间分辨光致发光光谱进一步揭示了PNCs中陷阱辅助非辐射复合的寿命特别短，这可能归因于表面缺陷态的有效钝化。此外，基于绿色PNC的发光二极管（LED）显示出明亮的白色光，其对应的色坐标（0.330，0.329）与标准白色光的色坐标基本一致，表明所制备的PNC在照明和显示技术方面具有潜在的实用价值。
Colloidal all-inorganic CsPbX3(X = Cl, Br, I) perovskite nanocrystals (PNCs) have recently shown incomparable superiority and vast application prospects in optoelectronics. However, developing low-cost and high-quality PNCs is the priority on their way to commercialization. Herein, we proposed a room-temperature quaternary alkylammonium (didodecyldimethylammonium bromide, DDAB) passivation strategy without organic polar solvents for synthesizing CsPbBr3PNCs with controllable morphology via a modified ligand-assisted reprecipitation method. The morphology and size of PNCs were strongly affected by the amount of surface ligands (DDAB and organic acids with different chain lengths), resulting in the shift of emission peak. Benefiting from tight binding of surface ligands, the resulting CsPbBr3PNCs exhibited bright green emission with near-unit photoluminescence quantum yields (PLQY) and excellent stability against water and air. The ultrafast transient absorption and time-resolved photoluminescence spectra further revealed that the lifetime of trap-assisted non-radiative recombination in PNCs was especially short, which could be attributed to the efficient passivation of surface defect states. Furthermore, light-emitting diodes (LEDs) based on green PNCs showed bright white light emission, and its corresponding color coordinate (0.330, 0.329) was almost consistent with that of the standard white light, which indicated that the as-prepared PNCs had latent practical value in lighting and display technology.
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