What They Say
There’s no secret that phosphorescent blue is coming to OLED – RGB or WOLED and QD OLED displays. At an event in Korea following SID, Kyung Hee University professor Kwon Jang-hyuk gave some interesting details about Samsung’s architecture for QD OLED.
- The current Samsung architecture is a four layer tandem structure, with three blue layers and one green phosphorescent layer.
- The use of phosphorescent blue should reduce the blue layers to one
- Samsung is also investigating dual (tandem) layers of blue
- Kwon said that Samsung is looking to use phosphorescent blue ‘within the year’. He pointed out that research published in February in Nature Photonics was a year old.
What We Think
It looks as though, after more than twenty years, we are on the ‘finishing straight’ for a really good blue material. The timing of the introduction of the blue is intriguing. UDC said that it’s material won’t be in volume production until 2024, but Kwon said ‘within the year’. Does that mean that the material that Samsung will use will not be from UDC? Samsung has been a big partner and customer for UDC, but the firm always likes to ‘capture all the value’, making partnerships with the firm always a subject of some tension.
A move from four to one or two emissive layers would significantly reduce the complexity of the manufacturing process and should mean higher throughput for SDC in its existing fab.
Dr Sunghan Kim gave a presentation at SID this year on this topic. BR)
