New breakthrough in OLED brightness! 60% increase in luminous efficiency is not a dream

According to foreign media reports, Professor Kim JaeHoon of Hanyang University in Korea announced in June a method for controlling the polarization of OLED emission that can increase the luminous efficiency of OLED light emitting layers by more than 60%. In the LCD, two linear polarizers are used as light switches to achieve the effect of transmitting or blocking light from the backlight. OLEDs, on the other hand, use only one circular polarizer to prevent reflection of external light and increase outdoor visibility.

Due to the use of a polarizer, the OLED light emission brightness is reduced by 50%, making the OLED screen with a lower luminance level more dim. In order to improve the brightness of OLED displays, various display companies are committed to improving the device structure, researching optical extraction technologies, and developing more efficient materials in an effort to compensate for the 50% light loss caused by polarizers by improving the light emitting mechanism. Professor Kim Jae-hoon thought about improving the efficiency of OLEDs from a brand-new perspective, namely, changing the polarization characteristics of OLED devices and reducing the light loss caused by polarizers.

Professor Kim Jae hoon explained that polymer OLEDs generally produce highly linear linearly polarized light. When this light passes through a light-emitting layer containing a chiral molecule, it can become circularly polarized light. Theoretically, circularly polarized light of a corresponding angle can pass through the OLED polarizer without any loss, and the light efficiency is improved by 100%. You can achieve lower power consumption and brighter OLED screens.

Using this principle, Prof. Kim Jaehoon and his team members have developed an OLED screen that is 60% more luminous efficiency than the current one. Prof. Kim Jae hoon will continue to conduct research on light-emitting polarization based on small-molecule OLED materials.

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