China's research and development of multi-quantum well structure perovskite LED devices far more efficient and more stable than international counterparts

Recently, Nanjing University of Technology overseas talent buffer base (Advanced Materials Research Institute, IAM), Jiangsu Province Flexible Electronics Key Laboratory Academician Huang Wei, Professor Wang Jianpu team made a major breakthrough in the research field of perovskite light-emitting diode (LED), they innovated A perovskite LED with multi-quantum well structure has been designed and fabricated. Its device efficiency and stability far exceed other perovskite LEDs reported by international peers. It is a perovskite material and its research in the field of luminescence. A new direction of research.

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As early as 2015, the research team from Florida State University was the first to develop a perovskite LED. They published the results in the journal Advanced Materials.

“Early work found that perovskites may be a promising material in the production of LEDs,” the researchers said. “But its performance has not yet reached full potential. We believe there is significant room for improvement.”

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In the past, other researchers have tried to make LEDs with perovskites, but none of them have been particularly efficient. The researchers believe that the organic-inorganic mixture can make LEDs perform better if the formula is properly adjusted.

At present, inorganic LEDs based on conventional inorganic semiconductor materials commonly used in the market mostly adopt epitaxially grown quantum well structures, which are complicated in preparation process, demanding on materials, and high in energy consumption.

For the organic light-emitting diode (OLED) that has emerged in the field of small-size display in recent years, the backbone of the IAM team, the principal of the research, and the vice president of the Advanced Materials Research Institute of Nanjing University of Technology, Professor Wang Jianpu, said: "Organic Light Emitting Diode (OLED) Different from inorganic LED, it is not limited by the preparation process. It can be used to prepare large-sized flexible devices by solution/vapor deposition method. It has irreplaceable advantages and has been initially applied to electronic products such as mobile phones and TVs. However, OLED is expanding its application range. There are still limitations, mainly due to the efficiency and stability of the device and the manufacturing costs to be further improved."

The organic-inorganic hybrid perovskite material has the advantages of organic and inorganic semiconductor materials, is suitable for solution processing of organic semiconductor materials and large-area film-forming preparation process, and has the defects of low defect density and high luminous efficiency of conventional inorganic luminescent materials. Good color purity and other advantages. Academician Huang Wei has accumulated and explored many years in the field of organic optoelectronics. Based on this, the team pioneered the research of perovskite LED in China.

According to Academician Huang Wei, the two-dimensional perovskite material has low luminous efficiency and poor film-forming and stability of three-dimensional perovskite materials. The team creatively uses solution processing methods to improve the luminous efficiency of the device. The quantum well structure was introduced into the perovskite LED, and a perovskite luminescent material having a multi-quantum well structure was developed, which has the advantages of high film-forming quality of the two-dimensional perovskite material and high luminous efficiency of the three-dimensional perovskite material. Using this multi-quantum well perovskite material with adjustable dimensions, the external quantum efficiency of the LED device is 11.7%, and the energy conversion efficiency is 5.5% at a current density of 100 mA cm-2.

It is reported that this important research result was recently published in the international top academic journal Nature Photonics. Academician Huang Wei, president of IAM and president of Nanjing University of Technology, said, "This is the world's highest record of perovskite LEDs. This breakthrough in technology has opened up a new direction for perovskite materials and their research in the field of luminescence. It is also expected. On the basis of further in-depth research, gradually realize industrialization."

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