Journal Article 2 organic light‐emitting diodes (OLEDs) adiabatic excitation energies 1 algebraic diagrammatic construction (ADC(2)) 1 anti‐aromatic compounds 1 bulk heterojunction (BHJ) 1 cyclazine derivatives 1 mehr ... diketopyrrolopyrrole 1 excitation energies 1 geometry optimization effects 1 intramolecular charge transfer (ICT) 1 inverted singlet‐triplet gap (INVEST) 1 optoelectronic and photovoltaic properties 1 organic solar cells (OSCs) 1 singlet‐triplet energy gap 1 time‐dependent density functional theory (TD‐DFT) 1 weniger ...