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Organic molecules with persistent room temperature phosphorescence(RTP)have attracted growing attention due to the long lifetime and inefficiency light emission.By combining molecular dynamics(MD)simulation,crystal structure prediction and quantum mechanics/molecular mechanics(QM/MM)scheme,we explored the mechanism of persistent RTP in 4,4-bis(9H-carbazol-9-yl)methanone(CZ2BP)cocrystal with choroform(TCM),but no RTP in amorphous and crystalline phases.