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Chinese scientists study new breakthrough in perovskite LED luminescence

【发表时间:2018/10/23】 【阅读次数:54】

   Xinhua News Agency, Xi'an, Oct. 11 (Reporter Xu Zuhua) Chinese scientists have made a new breakthrough in the

study of perovskite LED luminescence.They have proposed a new idea in the design of perovskite luminescence layer

by using low-temperature solution method, which will increase the externalquantum efficiency of near-infrared

perovskite LED to 20.7%. Relevant research results were published online in the journal Nature in October 11th.

  LED is a kind of semiconductor electronic component which can convert electric energy into light energy. It has the

characteristics of energy saving,environmental protection, safety and high brightness. It has been widely used in daily

life and production. Perovskite light-emitting diodes (PLDs) have theadvantages of both inorganic and organic

light-emitting diodes (OLEDs) in recent years. They have broad application prospects in the fields of low energy

consumption, high brightness, large-scale display and lighting.

  For many scientists who have been engaged in perovskite LED research for a long time, only flat, high coverage,

no obvious hole Perovskite Thin film is thebasis to achieve high efficiency devices. A team led by Huang Wei,

academician of the Chinese Academy of Sciences, chief scientist of the Institute of FlexibleElectronics, Northwest

Polytechnic University, and Wang Jianpu, executive vice president of the Institute of Advanced Materials, Nanjing

Polytechnic University,not only broke this point of view, but also reported the world's tallest perovskite LE.

D external quantum efficiency.According to Wang Jianpu, who completed the work, they found that when the

perovskite grains were like mahjong cards, disconnected and irregularlydistributed on the substrate surface, the

external quantum efficiency of 20.7% near infrared perovskite light-emitting diodes could be obtained. Compared

with the 13% foreign quantum efficiency obtained by the international counterparts, the near infrared perovskite

light-emitting diodes could be improved. Nearly 8percentage points, the performance far exceeds the current

popular OLED similar to the luminous band.Working with Tian He and Dai Dao Zinc of Zhejiang University, they

found that the perovskite luminescent layer was composed of dispersed perovskite grains anda low refractive index

organic insulating layer embedded between the grains, and this structure could further make the top electrode of

the device to form a high-low undulating fold structure, thus effectively enhancing the device. The luminous

efficiency.

   Academician Huang Wei, who is in charge of this research, further introduced that this achievement has

important theoretical and practical significance for thedevelopment and application of perovskite LED, and

provides a new idea and way for further promoting the industrial development of perovskite LED.

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