Samsung Display announced that it has employed new materials in its latest OLED stack that enables the display to be 16% more efficient compared to its currently OLEDs. The first phone to adopt the new OLED materials will be the Galaxy S21 Ultra.

OLED display development and inspection at Samsung Display

SDC did not reveal much about the new materials beyond saying that the new architecture "speeds up electron flows in the display’s organic layers". SDC says it uses a new OLED material, which seems to have been developed in-house (although SDC also says it has been 'closely collaborating with global material companies' to increase its competitive edge). SDC holds over 5,000 OLED material patents.

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LG also announced their 2021

LG also announced their 2021 TV panels would be more efficient too. Given Samsung talk about speeding up electrons I would hazard a guess that this is a new transport layer material and would point to Merck as the developer.

Plasmon

Or maybe UDC's plasmon technology:

Plasmon pholed are easy to implement with no major structural changes needed : ... Using an archetypal phosphorescent emitter, we achieve a two-fold increase in operational stability at the same brightness as a reference conventional device while simultaneously extracting 16 per cent of the energy from the plasmon mode as light. Our approach to increasing OLED stability avoids material-specific designs19–22 and is applicable to all commercial OLEDs that are currently used for lighting panels, televisions and mobile displays.

SID DisplayWeek 2021 - DSCC business conferenceSID DisplayWeek 2021 - DSCC business conference