4.8 Article

High-Luminance Microsized CH3NH3PbBr3 Single-Crystal-Based Light-Emitting Diodes via a Facile Liquid-Insulator Bridging Route

期刊

ACS NANO
卷 16, 期 4, 页码 6394-6403

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c00488

关键词

Micro/nanosized organic-inorganic hybrid perovskite single crystals; liquid-insulator bridging; perovskite light-emitting diodes; operating stability; polarized emission

资金

  1. National Natural Science Foundation of China [51821002, 91833303, 51973147, 52173178]
  2. Suzhou Science and Technology Plan Forward-looking Project [SYG202023]
  3. Suzhou Key Laboratory of Functional Nano Soft Materials
  4. 111 Project
  5. Collaborative Innovation Center of Suzhou Nano Science Technology
  6. Joint International Research Laboratory of Carbon-Based Functional Materials and Devices

向作者/读者索取更多资源

In this study, high-luminance PSC-LEDs based on single-crystalline CH3NH3PbBr3 microflakes were successfully fabricated using a liquid-insulator bridging (LIB) strategy. The device performance was systematically improved through crystal growth regulation and device architecture optimization.
Micro-/nanosized organic-inorganic hybrid perovskite single crystals (SCs) with appropriate thickness and high crystallinity are promising candidates for high-performance electroluminescent (EL) devices. However, their small lateral size poses a great challenge for efficient device construction and performance optimization, causing perovskite SC-based light-emitting diodes (PSC-LEDs) to demonstrate poor EL performance. Here, we develop a facile liquid-insulator bridging (LIB) strategy to fabricate high-luminance PSC-LEDs based on single-crystalline CH3NH3PbBr3 microflakes. By introducing a blade-coated poly(methyl methacrylate) (PMMA) insulating layer to effectively overcome the problems of leakage current and possible short circuits between electrodes, we achieve the reliable fabrication of PSC-LEDs. The LIB method also allows us to systematically boost the device performance through crystal growth regulation and device architecture optimization. Consequently, we realize the best CH3NH3PbBr3 microflake-based PSC-LED with an ultrahigh luminance of 136100 cd m(-2) and a half-lifetime of 88.2 min at an initial luminance of similar to 1100 cd m(-2), which is among the highest for organic-inorganic hybrid perovskite LEDs reported to date. Moreover, we observe the strong polarized edge emission of the microflake-based PSC-LEDs with a high degree of polarization up to 0.69. Our work offers a viable approach for the development of high-performance perovskite SC-based EL devices.

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