Organic room-temperature phosphorescence (RTP) is most relevant to a wide range of applications, including bioimaging , anticounterfeiting , organic light-emitting diode , Xray scintillator and information storage technologies . The key attributes of such systems is flexible structural design and tunable optical performance. Generally, two main principles are operative in organic RTP materials . The first involves intersystem crossing (ISC) by singlet excitons conversion to triplet excitons. As the dominant driving force of ISC, strong and efficient spin-orbit coupling (SOC) can be realized by introducing aromatic carbonyl groups, deuterated carbon atoms, halogens, and heteroatoms with lone-pair electrons. (The second principle relates to radiative migration of triplet excitons to the ground state, which is usually achieved by rigidifying the chromophores via crystallization, polymerization and matrix solidification.