Strongly-Confined CsPbI3 Quantum Dots by Surface Cleaning-Induced Ligand Exchange for Spectrally Stable Pure-Red Light-Emitting Diodes with Efficiency Exceeding 26%

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL

ACS Catalysis Pub Date : 2024-08-07 DOI:10.1021/acsmaterialslett.4c00912

Ke Ren, Jingcong Hu, Chenghao Bi, Shibo Wei, Xingyu Wang, Nora H. de Leeuw, Yue Lu, Manling Sui, Wenxin Wang

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Abstract

The advancement of pure-red perovskite light-emitting diodes (PeLEDs) is still a challenge because of surface “wastes” (like surface vacancies and excessive insulating ligands) on quantum dots (QDs). Herein, we develop a method to synthesize single-halide pure-red CsPbI₃ QDs, combining a strong quantum confinement effect and meticulous surface-cleaning-induced ligand exchange. We achieve pure-red emitting QDs by controlling the size and uniformity under iodide-rich conditions. Subsequently, vacancy defects and insulating ligands are cleared through introducing acid. Then this surface-cleaning process induces ligand exchange to further inhibit the nonradiative recombination and improve the electrical property of QDs. These QDs show a pure-red photoluminescence (PL) at 635 nm with the PL quantum yield (PLQY) of 99%. Finally, PeLEDs, which utilize these QDs, demonstrate a pure-red electroluminescence (EL) peak at 638 nm with a maximum external quantum efficiency (EQE) of 26.0% and an excellent half-lifetime (T₅₀) of 490 min at an original luminance of 102 cd/m².

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通过表面清洁诱导配体交换实现强致密 CsPbI3 量子点，从而生产出光谱稳定、效率超过 26% 的纯红光发光二极管

由于量子点（QDs）的表面 "废物"（如表面空位和过多的绝缘配体），纯红色的过氧化物发光二极管（PeLEDs）的发展仍然是一个挑战。在此，我们开发了一种合成单卤化物纯红色 CsPbI3 QDs 的方法，该方法结合了强大的量子约束效应和细致的表面清洁诱导配体交换。我们在富碘条件下通过控制尺寸和均匀性实现了纯红色发光 QDs。随后，通过引入酸来清除空位缺陷和绝缘配体。然后，这一表面清洁过程会诱导配体交换，从而进一步抑制非辐射重组，改善 QDs 的电学特性。这些 QD 在 635 纳米波长处显示出纯红色的光致发光（PL），PL 量子产率（PLQY）达到 99%。最后，利用这些 QD 的 PeLED 在 638 纳米波长处显示出纯红色电致发光（EL）峰，最大外部量子效率（EQE）为 26.0%，在原始亮度为 102 cd/m2 时，半衰期（T50）为 490 分钟。

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.