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New LEDs offer improved properties

By Paul Grad |

Flexible micro light-emitting diodes (LEDs) — a sub-100-µm light source for red, green and blue light — have become a strong candidate for the next-generation display due to their low power consumption, fast response, and flexibility. The previous micro-LED technology had drawbacks, such as poor efficiency, low thermal reliability, and the lack of interconnection technology for high-resolution micro-LED displays. Now, a team from the Korea Advanced Institute of Science and Technology (Daejeon, South Korea; www.kaist.ac.kr), led by professors Keon Jae Lee and Daesoo Kim, has developed flexible vertical micro LEDs (f-VLEDs) using anisotropic-conductive-film (ACF)-based transfer and interconnection technology. The Korean team has fabricated an f-VLED array through the precise alignment of ACF bonding. Those f-VLEDs achieved optical power density of 30 mW/mm2) — three times higher than that of lateral micro-LEDs — and improved thermal reliability and a lifetime of 100,000 h by reducing heat generation within the thin-film LEDs. Lee says the f-VLED can be used in low-power smart watches, mobile displays and wearable lighting. These devices are also suitable for biomedical applications, such as controlling the behavior of neuron…
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