Roles of Localized Electronic Structures Caused by π Degeneracy Due to Highly Symmetric Heavy Atom-Free Conjugated Molecular Crystals Leading to Efficient Persistent Room-Temperature Phosphorescence.

ABSTRACT: Conjugated molecular crystals with persistent room-temperature phosphorescence (RTP) are promising materials for sensing, security, and bioimaging applications. However, the electronic structures that lead to efficient persistent RTP are still unclear. Here, the electronic structures of tetraphenylmethane (C(C₆H₅)₄), tetraphenylsilane (Si(C₆H₅)₄), and tetraphenylgermane (Ge(C₆H₅)₄) showing blue-green persistent RTP under ambient conditions are investigated. The persistent RTP of the crystals originates from minimization of triplet exciton quenching at room temperature not suppression of molecular vibrations. Localization of the highest occupied molecular orbitals (HOMOs) of the steric and hig

SUBMITTER: Hirata S 

PROVIDER: S-EPMC6661950 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature