Perpustakaan Digital ITB

Two novel thermally activated delayedfluorescence (TADF)emitters, 3-phenylquinolino[3,2,1-de]acridine-5,9-dione (3-PhQAD) and 7-phenylquinolino[3,2,1-de]acridine-5,9-dione (7-PhQAD), were designed andsynthesized based on a rigid quinolino[3,2,1-de]acridine-5,9-dione (QAD)framework. With the effective superimposed resonance effect from electron-deficient carbonyls and electron-rich nitrogen atom, both emitters realizesignificant TADF characteristics with small?ESTs of 0.18 and 0.19 eV,respectively. And, molecular relaxations were dramatically suppressed for bothemitters because of their conjugated structure. In the devices, 3-PhQAD realizessuperior performance with a maximum external quantum efficiency (EQE) of19.1% and a narrow full width at half-maximum (FWHM) of 44 nm, whereas amaximum EQE of 18.7% and an extremely narrow FWHM of 34 nm arerealized for 7-PhQAD. These superior results reveal that apart from nitrogenand boron-aromatic systems, QAD framework can also act as a TADF matrix with effective resonance effect, and QADderivatives are ideal candidates to develop TADF emitters with narrow FWHMs for practical applications