Thermoluminescence

Physics

Organic chemistry

Dopant

Optics

Phosphor

HOMO/LUMO

Physical chemistry

Luminescence

Excited state

Phosphorescence

Atomic physics

Quantum yield

Chemistry

Metallurgy

Materials science

Dibenzothiophene

Molecule

Singlet state

Sulfur

Optoelectronics

Doping

Photochemistry

Fluorescence

Persistent luminescence

Advanced Materials

Doping has shown very promising potential in endowing room-temperature phosphorescence (RTP) properties of organic phosphors with minimal effort. Here, a new isomer design and doping strategy is reported that is applicable to dibenzothiophene (DBT) and its derivatives. Three isomers are synthesized to study the dopant effect on enhancing RTP of DBT derivatives. It is found that isomer dopants bearing close resemblance to the host with matched highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels and small energy difference between singlet- and triplet-excited states can yield efficient RTP for the doped system. Meanwhile, phosphorescence color from yellow to red is achieved by varying isomer dopants used for doping the DBT derivatives. This work represents an RTP enhancement strategy based on isomer design and doping to construct luminescent organic phosphors.

Structurally Resemblant Dopants Enhance Organic Room‐Temperature Phosphorescence