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Korea Research Foundation Develops Saturated Phosphorescent Blue Emitter
June 21, 2020
The Korea Research Foundation announced on June 14 that a research team led by Jin Sung-ho, a professor at Busan National University developed a deep blue-emitting phosphorescent OLED which they claim is four times more efficient than OLEDs using blue fluorescent material.
June 21, 2020
The Korea Research Foundation announced on June 14 that a research team led by Jin Sung-ho, a professor at Busan National University developed a deep blue-emitting phosphorescent OLED which they claim is four times more efficient than OLEDs using blue fluorescent material.
The research team solved low luminance and efficiency problems by adjusting doping concentration to optimize concentration imbalance between electrons and pores inside an OLED luminous layer. Although the external quantum efficiency (the ratio of actual light emitted outside the material) of current dark blue phosphorescent OLEDs is only 15 percent, the researchers achieved 24 percent efficiency by controlling the concentration of electrons and pores in the light emitting layer.
"While resolving the problem of low external quantum efficiency, we can satisfy NTSC's blue standards that establish luminous characteristics and color TVs’ color representation standards, so we can use them for future QLED rear lights and next-generation displays," said Prof. Jin. The research results were published in the June 9 edition of the international journal "Advanced Materials." The report did not mention lifetime or performance in terms of cd/A per CIE y coordinate, which are keys measures of usability in a commercial product. It also looks like they use an Iridium based compound, meaning it is likely that the emitter violates some of UDC’s IP.
"While resolving the problem of low external quantum efficiency, we can satisfy NTSC's blue standards that establish luminous characteristics and color TVs’ color representation standards, so we can use them for future QLED rear lights and next-generation displays," said Prof. Jin. The research results were published in the June 9 edition of the international journal "Advanced Materials." The report did not mention lifetime or performance in terms of cd/A per CIE y coordinate, which are keys measures of usability in a commercial product. It also looks like they use an Iridium based compound, meaning it is likely that the emitter violates some of UDC’s IP.