TADF-based red fluorescent OLED boasts world’s best luminous efficiency

November 27, 2019 //By Julien Happich
fluorescent OLED
Idemitsu Kosan Co.,Ltd., and Toray Industries have jointly developed an organic electroluminescent (EL) device offering what the companies claim to be the world’s highest luminous efficiency, with a near practical range of 46 cd/A. The new device employs thermally activated delayed fluorescence (TADF) and red fluorescent materials.

This new technology could help reduce the costs and energy consumption of organic EL displays while enabling wide color gamuts. It is the result of combining Idemitsu Kosan’s development of TADF material, offering an exceptional luminous efficiency and lifespan, and Toray’s development of new red fluorescent material with a narrower emission spectrum compared to conventional counterparts, which provides high color purity.

Organic EL displays comprise red, green, and blue light-emitting components. The devices emitting red light mainly employ phosphorescent materials. These materials can convert 100% of electricity to light and enhance luminous efficiency. The downside is that they are expensive because they incorporate rare metals and suffer from low color purity due to wide emission spectra.

Those drawbacks have spurred interest in TADF materials in recent years. Technologies employing TADF materials can convert all power to light, as do phosphorescent ones. Another advantage is that they can attain high color purity when used in combination with fluorescent materials, which have narrow emission spectra. TADF materials also are free of rare metals, so they can help to reduce costs.

Both companies concluded a technical alliance for organic EL materials on September 26, 2017. They have since collaborated in developing new materials by drawing on each other’s organic EL materials, technologies and expertise. The red organic EL device employing TADF materials that the companies developed together attains the same results as mainstream red phosphorescent devices and represents significant progress towards a swiftly materializing new technology. The two companies plan to drive forward to secure adoption of their materials and technologies in mobile and television applications.

Toray - www.toray.com

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