Helically Chiral Tetradentate Pt(II) Complexes for Simultaneous Deep‐Blue Electroluminescence and Circularly Polarized Luminescence via Diastereoselective Synthesis

ABSTRACT Circularly polarized organic light‐emitting diodes (CP‐OLEDs) have attracted great attention because of their promising applications in 3D displays. However, developing high‐performance CP‐OLEDs typically face the challenge of integrating large‐scale availability of emitters, device efficiency, color purity, and brightness, especially in the deep‐blue spectral region. Herein, we developed a novel strategy to successfully realize the diastereoselective and gram‐scale synthesis of helically chiral tetradentate Pt(II) complexes with high configurational stabilities through a central chirality adaptively induced helical chirality (CAIH) approach. The bulky central chiral moiety facilitates the suppression of intermolecular interactions and increases the color purity and molecular rigidity. R,M ‐PtCam2 showed a quantum efficiency of 99% and high color purity, with a full‐width at half‐maximum (FWHM) of 19.8 nm. R,M ‐PtCam2/ P ‐PtCam2‐based deep‐blue OLEDs successfully displayed obvious and mirror‐image CP electroluminescence signals. R,M ‐PtCam2 CP‐OLED exhibited a high color purity (FWHM = 24 nm) and a high maximum brightness of up to 51592 cd/m 2 ; moreover, it also achieved a maximum external quantum efficiency (EQE) of 33.2%, along with a record‐high EQE of 30.9% at 1000 cd/m 2 for all reported deep‐blue CP‐OLEDs with CIE y < 0.20. This study provides a molecular design strategy to prepare robust helically chiral Pt(II) emitters for high‐performance deep‐blue phosphorescent CP‐OLEDs.