Optimized triple core blue emitters based on anthracene-pyrene-anthracene chromophores for organic light-emitting diodes

Three new fluorescent triple-core emitters were newly synthesized by attaching an optimized electron-donating group to an anthracene-pyrene-anthracene core moiety, resulting in 1,6-di(anthracen-9-yl)pyrene (DAP), 10,10 '-(pyrene-1,6-diyl)bis(N,N-diphenylanthracen-9-amine) (DPA-DAP-DPA), and 4,4 '-(pyrene-1,6-diylbis (anthracene-10,9-diyl))bis(N,N-diphenylaniline) (TPA-DAP-TPA). The photophysical, thermal, and electrolu-minescence properties of these synthesized materials were examined experimentally and theoretically. The triple-core derivatives were found to exhibit high thermal stability, with decomposition temperatures greater than 433 degrees C. DAP, DPA-DAP-DPA, and TPA-DAP-TPA showed deep-blue, sky-blue, and real blue photo-luminescence emission, with maximum wavelengths of 430, 497, and 459 nm, respectively, in the solution state. Among the synthesized materials, TPA-DAP-TPA showed an excellent photoluminescence quantum yield of 77%. The device doped with TPA-DAP-TPA showed a high efficiency of 5.68 cd/A, CIE coordinates of (0.143, 0.151), and an external quantum efficiency of 4.64% at 10 mA/cm2, indicating that the device has potential applications in mobile phones.

Automated summary

Three newly synthesized fluorescent triple-core emitters with optimized electron-donating groups showed high thermal stability and potential for mobile phone applications.