Close to 100%! Perovskite based LED luminous efficiency record

Is expected to be applied to the field of lighting and solar cells etc.

In November 2018 09, 09:04 source: Science Daily
 

Scientists will be integrated into the perovskite LED.

Source: University of Cambridge official website

According to the official website of the University of Cambridge recently reported that the scientists will perovskite integrated into the light emitting diode (LED), the product inside the luminous efficiency close to the 100% record, and organic LED (OLED) is comparable to the best, the future is expected to be used in lighting, display, communication and the field of the next generation of solar cell.

Compared with the widely used in high-end consumer electronic products OLED, LED perovskite based lower manufacturing cost, and can emit light with high color purity. Although scientists had developed perovskite based LED, but the product will be electricity into light efficiency than the traditional OLED. Hybrid perovskite based LED of University of Cambridge professor Richard Fred Cavendish laboratory team previously developed, due to its internal defects in the crystal structure of calcium titanium ore loss, limiting their luminous efficiency.

Now, the team through the new research, let the perovskite together with polymers to form a composite layer, can achieve higher luminous efficiency, close to the theoretical efficiency limit of OLED thin films. The results of the study published in the latest issue of "nature photonics magazine".

LED device - perovskite polymer composite layer by two-dimensional and three-dimensional perovskite and insulation polymer. When the ultrafast laser irradiation on the structure, charge carrying energy in 1/1000000000000 seconds from 2D to 3D moving region. Then, 3D region "lack of coordination" charge effectively re combination and glow.

The author of the communication, David (transliteration), explained: "from the two-dimensional area to the energy transfer of the 3D region happened very fast, and the charge and defects of three dimensional polymer within the area of mutual isolation, these mechanisms can prevent the defects' trouble ', so as to prevent the loss of energy. This is the first time scientists in perovskite based products to achieve this point."

Although LED and OLED have started the perovskite based competition in terms of efficiency, but its stability is poor, yet can not be used for consumer electronic products. When the perovskite based LED first came out, only a few seconds of life. In a new study of perovskite based LED has a half-life of about 50 hours, although have improved a lot, but the distance required for the application of commercial life requirement is still far away, to achieve this, need a broad industrial development plan. Di Dawei said: "understanding the degradation mechanism of LED is the key to future improvement." (Liu Xia)

(Hu Xin: commissioning editor (Intern), Xiong Xu)

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