Molecular Design Strategy for Meta-Substituted Aromatic Organic Halides in Zero-Lead-Release Halide Perovskites with Efficient Waterproof Light Emission

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Jan, Pei-En ; Liang, Hao-Chi ; Cheng, Ren-Wei ; Greve, Christopher ; Chuang, Yung-Tang ; Chiu, Yung-Ling ; Tan, Guang-Hsun ; Elsenety, Mohamed M. ; Chang, Chih-Li ; Dorrah, Dalia M. ; Lai, Hoong-Lien ; Chiu, Po-Wei ; Sun, Sheng-Yuan ; Li, Yun-Li ; Herzig, Eva M. ; Chou, Ho-Hsiu ; Lin, Hao-Wu:
Molecular Design Strategy for Meta-Substituted Aromatic Organic Halides in Zero-Lead-Release Halide Perovskites with Efficient Waterproof Light Emission.
In: Advanced Functional Materials. (2024) . - 2408323.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.202408323

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Abstract

Halide perovskites have received an immense attention in the field of optoelectronics due to their outstanding photophysical properties. But so far, lead-based halide perovskites still account for most of the research, which raises concerns due to lead toxicity. Herein, a new design strategy is proposed utilizing a super large, energetically higher singlet and triplet energy levels aromatic organic cation to incorporate into the perovskite structure, forming ultra-stable high-performance 2D/3D (quasi-2D) perovskite. The judicious molecular design of connecting all the phenyl groups at their meta sites ensures the simultaneous achievement of a large molecular weight and high singlet and triplet energy levels. The resulting quasi-2D perovskite thin films not only exhibits excellent emission properties but also, surprisingly, show long-term waterproof-level stability. The robustness of these perovskites is confirmed by their extraordinary emission stability upon direct water immersion and almost undetectable lead release in water. Proof-of-concept of a water-resistant color conversion-type perovskite near-infrared (NIR) light-emitting diode (LED) is demonstrated, showing high external quantum efficiency (EQE) and power conversion efficiency (PCE) of 20.5% and 13.3%, respectively. It is believed these results and strategy pave a new way for realizing environmentally friendly lead halide materials and devices.