Ultrapure green organic light-emitting diodes based on highly distorted fused π-conjugated molecular design

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Written By Fluxim AG

Fan, XC., Wang, K., Shi, YZ. et al.

Nat. Photon. (2023). https://doi.org/10.1038/s41566-022-01106-8

Researchers developed a new ultrapure green emitter called DBTN-2 for use in organic light-emitting diode (OLED) displays, which has a highly efficient operation due to the introduction of multiple carbazole moieties resulting in a high density of triplet states and a fast rate of reverse intersystem crossing.

An OLED using DBTN-2 as an emitter demonstrated a high photoluminescence quantum yield, strong horizontal dipole orientation, and excellent external quantum efficiency of 35.2% with suppressed efficiency roll-off, meeting commercial requirements for a green OLED display.

The obtained PL intensity angle-dependent patterns were analysed using Setfos with refractive index n, extinction coefficient k values of SF3-TRZ at 520 nm (peak wavelength of DBTN-2) as basic information for simulation.

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