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Enhancing Light Outcoupling Efficiency via Anisotropic Low Refractive Index Electron Transporting Materials for
Shuang-Qiao Sun1, Jing-Wen Tai1, Wei He1
1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|March 2, 2024
Summary
Researchers developed a new material, BPBiPA, to improve light extraction in perovskite light-emitting diodes (PeLEDs). This material enhances efficiency, leading to record performance in green PeLEDs.
Area of Science:
- Materials Science
- Optoelectronics
- Organic Electronics
Background:
- High-quality perovskite films with excellent photoluminescence quantum yield are achievable.
- Insufficient light extraction limits the efficiency of perovskite light-emitting diodes (PeLEDs).
Purpose of the Study:
- To develop an advanced electron transporting material for high-efficiency PeLEDs.
- To enhance light outcoupling efficiency and carrier injection in PeLEDs.
Main Methods:
- Synthesis of an anisotropic multifunctional electron transporting material, BPBiPA.
- Characterization of BPBiPA's optical and electronic properties, including its low extraordinary refractive index (ne) and high electron mobility.
- Optical simulations to analyze light extraction enhancement.
- Fabrication and testing of green PeLEDs using BPBiPA.
Main Results:
- BPBiPA exhibits a low ne of 1.59 along the z-axis, mitigating plasmonic losses and enhancing photon extraction.
- High electron mobility of BPBiPA facilitates balanced carrier injection.
- Achieved record external quantum efficiency of 32.1% and current efficiency of 111.7 cd A-1 in green PeLEDs.
Conclusions:
- The developed anisotropic material BPBiPA significantly improves light outcoupling efficiency in PeLEDs.
- BPBiPA offers a promising strategy for designing next-generation high-performance PeLEDs.
- This work provides new insights into electron transporting materials for advanced optoelectronic devices.
