New additives make perovskite LEDs more stable and efficient

In the "Nature Photonics" magazine published on the 16th, researchers from Princeton University in the United States published a paper saying that they have developed a new technology that produces lower cost, higher efficiency, and better performance by adding organic ammonium halides. Stable perovskite light-emitting diodes (LEDs).

Over the past 10 years, the application of LED has become more and more extensive. Its energy saving, environmental protection, long life, and small size, but the manufacturing cost is relatively high, reducing the LED manufacturing cost is an important goal of the relevant industry. Perovskite is an ancient material, first discovered in Russia in the Ural Mountains in 1839, and named after the Russian mineralogist Lev Polovski (Perovskite in English). This material is mostly cubic or octahedral and has unique properties. It can be a semiconductor or a superconductor depending on its structure. As a new functional material, perovskite has great potential for development in the fields of environmental protection and industrial catalysis. In recent years, it has received continuous attention due to its application in the field of solar cells.

Organic-inorganic hybrid perovskite materials are also considered by many scientists as substitutes for gallium nitride and other LED preparation materials. However, the disadvantages of low film forming efficiency and low stability have restricted their application in the LED field. This time, new technologies developed by researchers at Princeton University have solved this problem. In their paper, they stated that adding organic ammonium halides, especially long-chain organic ammonium halides, to the perovskite solution during the manufacture of perovskite films will result in much smaller perovskite crystallites and the resulting perovskite films. Thinner and smoother. Such a perovskite film means better external quantum efficiency, making the light emitting diode more efficient and more stable.

Compared to silicon and other LED preparation materials, perovskites are cheaper and the preparation process is simpler. The researchers said that the new technology will accelerate the commercial application of perovskites in the fields of lighting, display and laser, making future LED products more efficient and cheaper. (Reporter Liu Haiying)