Boron‐Dipyrromethene‐Based Fluorescent Emitters Enable High‐Performance Narrowband Red Organic Light‐Emitting Diodes.

Narrowband organic light‐emitting diodes (OLEDs) are receiving significant attention and have demonstrated impressive performance in blue and green OLEDs. However, developing high‐performance narrowband red OLEDs remains a highly desired yet challenging task. Herein, we have developed narrowband red fluorescent emitters by utilizing a boron‐dipyrromethene (BODIPY) skeleton in combination with a methyl‐shield strategy. These emitters exhibit small full‐width at half‐maxima (FWHM) ranging from 21 nm (0.068 eV) to 25 nm (0.081 eV) and high photoluminescence quantum yields (ΦPL) ranging from 88.5 % to 99.0 % in toluene solution. Using BODIPY‐based luminescent materials as emitters, high‐performance narrowband red OLEDs have been assembled with external quantum efficiency as high as 18.3 % at 623 nm and 21.1 % at 604 nm. This work represents, to our knowledge, the first successful case of achieving NTSC pure‐red OLEDs with the Commission Internationale de l'Éclairage (CIE) coordinates of [0.67, 0.33] based on conventional fluorescent emitters. [ABSTRACT FROM AUTHOR]