Chinese researchers have made new breakthroughs in researching perovskite LED illumination
2019-04-25

Xinhua News Agency, Xi'an, October 11 (Reporter Xu Zuhua) Chinese researchers recently made new breakthroughs in the research of perovskite LED luminescence. They used the low-temperature solution method to propose a new idea in the design of perovskite luminescent layer, which will be near-infrared calcium. The external quantum efficiency of the titanium ore LED is increased to 20.7%. Relevant research results were published online in the journal Nature on October 11.


LED is a kind of semiconductor electronic component that can convert electrical energy into light energy. It has the characteristics of energy saving, environmental protection, safety and high brightness, and has been widely used in daily life and production. The perovskite light-emitting diodes that have emerged in recent years have the advantages of inorganic LEDs and organic light-emitting diodes (OLEDs), and have broad application prospects in the fields of low energy consumption, high brightness, large size display and illumination.


For many scientists who have been engaged in perovskite LED research for a long time, only the perovskite film with flatness, high coverage and no obvious holes is the basis for realizing high-efficiency devices. The team led by Huang Wei, chief scientist of the Chinese Academy of Sciences, chief scientist of the Institute of Flexible Electronics of Northwestern Polytechnical University, and Wang Jianpu, executive vice president of the Advanced Materials Research Institute of Nanjing University of Technology, not only broke the above research paper published in Nature. The point of view also reports the highest external quantum efficiency of the current perovskite LED in the world.


According to Wang Jianpu, the main performer of this work, they found that when the perovskite grains are like mahjong tiles, which are not connected to each other and irregularly distributed on the surface of the substrate, the external quantum efficiency can be as close as 20.7%. Infrared perovskite light-emitting diodes have improved by nearly 8 percentage points compared with the 13% external quantum efficiency obtained by international counterparts, and their performance far exceeds the current popular OLEDs with similar emission bands.


Through cooperation with Zhejiang University Tianhe and Daidao Zinc team, they found that this perovskite luminescent layer is composed of dispersed perovskite grains and a low refractive index organic insulating layer embedded between the grains, and this The structure can further form a high and low undulating pleat structure of the top electrode of the device, thereby effectively improving the light extraction efficiency of the device.


Academician Huang Wei, the person in charge of the research, further said that this achievement has important theoretical and practical significance for the development and application of perovskite LED, and provides a new idea for further promoting the industrialization of perovskite LED. way.


Source: Xinhuanet