Pure room temperature phosphorescence emission of an organic host–guest doped system with a quantum efficiency of 64%

Abstract

A new doped system with pure phosphorescent emission is constructed using four 1-(4-(diphenylamino)phenyl)-2-phenylethan-1-one derivatives containing halogen atoms as the guests and benzophenone as the host. That is, the doped system...

Efficient and organic host–guest room-temperature phosphorescence: tunable triplet–singlet crossing and theoretical calculations for molecular packing

“…According to our previous work, the host matrix is believed to play a synergistic role in energy transfer during the phosphorescence emission of guest molecules, and the smaller energy gaps between the excited state energy levels of the host and guest molecules are obviously benecial for energy transfer. [32][33][34][35] Therefore, four TPA derivatives (DBA, MDBA, MODBA, and MADBA) with electron donating groups were designed and synthesized as the guests (Fig. 1a, ESI Scheme S1 †).…”

“…2a). [32][33][34][35] As shown in Fig. 2b, the highest occupied molecular orbitals (HOMOs) and the lowest unoccupied molecular orbitals (LUMOs) of all guest molecules are distributed on the entire molecule.…”

“…2c). [32][33][34][35] Moreover, from DBA to MADBA, the energy gaps between the S 1 of the guest molecule and the T 1 of the host TPA molecule gradually decrease. The reduced energy gaps are benecial for ISC and RISC of excitons, increasing the TADF and RTP intensity of the doped materials (Fig.…”

“…Notably, at MADBA concentration as low as 0.0001 mol% (1 : 100 000), the hostguest doped materials still exhibited an obvious visible aerglow, indicating the high efficiency of our host-guest luminescent systems. 24,[31][32][33][34][35] The analysis of the single crystal structure of materials by using an X-ray diffractometer is currently the available method to observe organic compounds at the molecular level. The high molar ratio of guest to host molecules in doped materials prevents obtainment of single crystals that contain both host and guest molecules.…”

One-axis Two-wing Guest-Host Strategy for Constructing Ultralong-lifetime Near-infrared Organic Phosphorescence Materials for Bioimaging

“…= 64 %) RTP material DOB/BPO reported in our previous work was selected as a control and DOB/BPO NPs were prepared by the same method. [50] Dynamic light scattering and transmission electron microscopy data indicated both DMAPy/BPO and DOB/BPO NPs formed a near-spherical morphology with a mean hydrodynamic diameter of ≈ 100 nm (Fig. 5a and Supplementary Fig.…”