Login / Signup

Robust Luminescent Molecules with High-Level Reverse Intersystem Crossing for Efficient Near Ultraviolet Organic Light-Emitting Diodes.

Jinke ChenHao LiuJingjing GuoJianghui WangNuoling QiuShu XiaoJiajin ChiDezhi YangDongge MaZhujin ZhaoBen Zhong Tang
Published in: Angewandte Chemie (International ed. in English) (2022)
Organic light-emitting diodes (OLEDs) radiating near ultraviolet (NUV) light are of high importance but rarely reported due to the lack of robust organic short-wavelength emitters. Here, we report a short π-conjugated molecule (POPCN-2CP) with high thermal and morphological stabilities and strong NUV photoluminescence. Its neat film exhibits an electroluminescence (EL) peak at 404 nm with a maximum external quantum efficiency (η ext,max ) of 7.5 % and small efficiency roll-off. The doped films of POPCN-2CP in both non-polar and polar hosts at a wide doping concentration range (10-80 wt%) achieve high-purity NUV light (388-404 nm) and excellent η ext,max s of up to 8.2 %. The high-level reverse intersystem crossing improves exciton utilization and accounts for the superb η ext,max s. POPCN-2CP can also serve as an efficient host for blue fluorescence, thermally activated delayed fluorescence and phosphorescence emitters, providing excellent EL performance via Förster energy transfer.
Keyphrases
  • energy transfer
  • light emitting
  • quantum dots
  • room temperature
  • photodynamic therapy
  • sensitive detection
  • ionic liquid
  • reduced graphene oxide
  • single molecule