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Successful Development of 'PeLED', Addressing Blue Light Issues and Economics
Published2020.10.13 12:01Development of blue-emitting perovskite LEDs
Triple the luminous efficacy by replacing the material within the device.
A research team led by Professors Myung-Hoon Song and Sang-Kyu Kwak of UNIST and Professor Han-Young Woo of Korea University announced on the 13th that they have jointly developed a 'perovskite light-emitting device (PeLED)' that emits blue light. The perovskite light-emitting device developed by the research team is three times more efficient at producing blue light than existing devices and has high color purity, enabling the implementation of a vivid blue color.
▲Comparison of color purity (luminescence spectrum stability) of light-emitting devices [Photo = UNIST]
However, existing blue PeLEDs only achieved a 10% efficiency in converting electrical energy into light, resulting in power consumption less than half that of red or green. Furthermore, the ions added to create blue PeLEDs caused color purity to deteriorate over time, posing a problem.
So, the research team simplified the process by changing the 'hole transport layer' material adjacent to the perovskite in the light-emitting device. By using a newly synthesized organic material as a hole transport layer, the efficiency was improved by 3 to 4 times compared to existing light-emitting devices, and the 'electroluminescence spectrum' was also greatly stabilized, achieving both problem solving and economic feasibility.
Professor Song Myung-hoon said, “PeLED achieved efficiency levels comparable to OLED (Organic LED) in a short period of six years, but its blue light efficiency was only around 10%.” He added, “This research is expected to simultaneously improve device efficiency and color purity, which will help accelerate commercialization.”
Meanwhile, the results of this study were published on September 10 in ACS Nano, a world-renowned journal in the field of nanotechnology.
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