A research team, led by Professors Byungsoo Bae at KAIST and Taewoo Lee at Seoul National University, has developed a new perovskite light-emitting diode (PeLED) display material.

PeLED is a type of LED that uses perovskite as a light-emitting material. Currently, the production cost is lower than that of organic light emitting diodes (OLEDs) and quantum dot light emitting diodes (QLEDs), and it has the advantage of enabling sophisticated color realization.

The research team succeeded in solving the problem of degradation of perovskites with exposure to light, heat, moisture, and oxygen, while keeping the material structure and manufacturing process simple. A substance called siloxane that is resistant to heat was chemically reacted with perovskite in a special way. Several relatively small siloxane particles encapsulated the perovskite particles to protect them. It has succeeded in maintaining the existing luminescence performance while elaborately preventing moisture and oxygen penetration at the molecular level.

As a result of measuring the performance in a high-temperature and high-humidity environment, the research team confirmed that the luminous efficiency (the ratio of making light with electricity) remains above the original 70%, and this maintenance period is calculated to be 600 days or longer.

The research team added, "The siloxane capsule can also prevent the toxicity of lead, a component of perovskite."

Professor Bae said, "It is advantageous in terms of cost by maintaining the existing synthesis process as it is," he said. "It will be an opportunity to accelerate the commercialization of the next-generation display light emitting material.



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