Efficient Red Electroluminescence From Phenanthro[9,10‐d]imidazole‐Naphtho[2,3‐c][1,2,5]thiadiazole Donor‐Acceptor Derivatives

Abstract

Red emission is one of the three primary colors and is indispensable for full color displays. Fluorescent materials that can generate efficient red electroluminescence (EL) are limited and need to be developed. In this work, we report efficient red emitters based on phenanthro[9,10-d]imidazolenaphtho[2,3-c][1,2,5]thiadiazole donor-acceptor derivatives. The molecules, abbreviated as PINzP and PINzPCN, exhibited high photoluminescence quantum yield (PLQY) up to unity in doped films. They can also reach a relatively high PLQY of 30% in neat films. PINzP and PINzPCN were capable of generating efficient red EL in doped devices with a maximum external quantum efficiency (EQE) of 6.96% and 5.92%, respectively.

Efficient non-doped blue electroluminescence based on phenanthroimidazole–benzoylfluorene hybrid molecules with high spin–orbit coupling and balanced charge mobilities

“…The small absorption peaks at 367 nm are assigned to characteristic absorption peaks of PPI. 32 At the same time, the redshift of the absorption peak of PPIFB compared to that of PPIBF is due to the more effective π-conjugation resulting from the smaller torsion angle of PPIFB, which is in general agreement with the theoretical calculations.…”

A Novel Deep Blue LE-Dominated HLCT Excited State Design Strategy and Material for OLED

“…The electrochemical property revealed carrier injection and transport properties, which was important to design the OLED device structure. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were calculated by the following equation [ 36 , 37 ]: HOMO (eV) = −[E ox − E(Fc/Fc + ) + 4.8] LUMO (eV) = −[E red − E(Fc/Fc − ) + 4.8] …”