Theoretical study of the low-lying electronic excited states for molecular aggregates

We present here a brief summary of a National Natural Science Foundation Major Project entitled ＂Theoretical study of the low-lying electronic excited state for molecular aggregates＂. The project focuses on theoretical investigation of the electronic structures and dynamic processes upon photo-and electric-excitation for molecules and aggregates. We aim to develop reliable methodology to predict the optoelectronic properties of molecular materials related to the electronic excitations and to apply in the experiments. We identify two essential scientific challenges： （i） nature of intramolecular and intermolecular electronic excited states; （ii） theoretical description of the dynamic processes of the coupled motion of electronic excitations and nucleus. We propose the following four subjects of research： （i） linear scaling time-dependent density-functional theory and its application to open shell system; （ii） computational method development of electronic excited state for molecular aggregates; （iii） theoretical investigation of the time evolution of the excited state dynamics; （iv） methods to predict the optoelectronic properties starting from electronic excited state investigation for organic materials and experimental verifications.