Energy-Efficient Perovskite LEDs with Rec. 2020 Compliance

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL ACS Energy Letters Pub Date : 2024-07-03 DOI:10.1021/acsenergylett.4c01501

Shiyu Xing, Yucai Yuan, Gan Zhang, Shiang Zhang, Yaxiao Lian, Weidong Tang, Ke Zhou, Shengnan Liu, Yuxiang Gao, Zhixiang Ren, Guoling Zhang, Tulai Sun, Baodan Zhao, Dawei Di

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Abstract

Perovskite LEDs (PeLEDs) show promise as a next-generation light source. For energy-efficient displays, PeLEDs with all-rounded performance combining high energy-conversion efficiencies (η_ECE), brightness, and stability with spectral compliance are required. However, such a demanding goal is yet to be achieved. Here we demonstrate PeLEDs exhibiting a high η_ECE of 21.3%, exceptional brightness of ∼3.2 × 10⁵ cd m^–2 (max: ∼4.6 × 10⁵ cd m^–2), long lifetimes (T₅₀) of ∼125 h at 1000 cd m^–2 (extrapolated T₅₀: ∼4900 h at 100 cd m^–2), and an unprecedented Rec. 2020 color gamut coverage of 97.7% for green LEDs. The η_ECE values are record-high for visible PeLEDs, contrasting to most studies in which EQEs rather than the overall efficiencies are considered. We present how (i) the spectral tuning for Rec. 2020 compliance, (ii) the elimination of nonradiative traps for enhanced EQEs, brightness, and stability, and (iii) the low driving voltages for high η_ECE are simultaneously achieved, paving the way toward energy-efficient PeLED displays.

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符合 Rec. 2020 标准的高能效 Perovskite LED

Perovskite LED（PeLED）有望成为下一代光源。为了实现高能效显示，PeLED 必须具备全面的性能，将高能量转换效率 (ηECE)、亮度、稳定性和光谱一致性结合起来。然而，这一苛刻的目标尚未实现。在此，我们展示了ηECE 高达 21.3%、亮度高达 ∼3.2 × 105 cd m-2（最大值：∼4.6 × 105 cd m-2）、寿命长（T50）达 ∼125 h（1000 cd m-2）（推断 T50：∼4900 h（100 cd m-2））的 PeLED，以及绿光 LED 史无前例地达到 97.7% 的 Rec.2020 色域覆盖率。对于可见光 PeLED 而言，ηECE 值创下了历史新高，这与考虑 EQE 而非总体效率的大多数研究形成了鲜明对比。我们介绍了如何同时实现（i）光谱调谐以符合 Rec.2020 标准，（ii）消除非辐射陷阱以提高 EQE、亮度和稳定性，以及（iii）低驱动电压以实现高 ηECE，从而为实现高能效 PeLED 显示屏铺平道路。

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.