Ultralong organic phosphorescence from isolated molecules with repulsive interactions for multifunctional applications

Abstract

Intermolecular interactions, including attractive and repulsive interactions, play a vital role in manipulating functionalization of the materials from micro to macro dimensions. Despite great success in generation of ultralong organic phosphorescence (UOP) by suppressing non-radiative transitions through attractive interactions recently, there is still no consideration of repulsive interactions on UOP. Herein, we proposed a feasible approach by introducing carboxyl groups into organic phosphors, enabling formation of the intense repulsive interactions between the isolated molecules and the matrix in rigid environment. Our experimental results show a phosphor with a record lifetime and quantum efficiency up to 3.16 s and 50.0% simultaneously in film under ambient conditions. Considering the multiple functions of the flexible films, the potential applications in anti-counterfeiting, afterglow display and visual frequency indicators were demonstrated. This finding not only outlines a fundamental principle to achieve bright organic phosphorescence in film, but also expands the potential applications of UOP materials.

Boosting the Phosphorescence Efficiency in Doped Organic Crystals: Critical Role of Hydrogen Bonding

“…One can see that BI crystals are packed more closely than NMeBI. This point can also be supported by comparing their crystal densities (BI: 1.471 g/cm 3 > NMeBI: 1.347 g/cm 3 ). Therefore, it can be concluded that the rigid environment created by abundant hydrogen bonds and π−π stacking is responsible for the observed pRTP in the doped crystals.…”

Temperature-Regulated Dual Phosphorescence and Mechanical Strain-Induced Luminescence Modulation in a Plastically Bendable and Twistable Organic Crystal

“…Additionally, according to El-Sayed’s rule, the magnitude of SOC (and therefore the ISC) can be elevated by promoting the non-bonding characteristic (n) to π–π* transitions. In such a context, different non-covalent interactions such as halogen bonding, intermolecular electronic coupling of π and n moieties, and efficient π–π stacking by H-aggregation have been proposed to promote ISC, leading to efficient RT phosphorescence. − To understand the ISC routes, TD-DFT calculations have been performed in the monomeric and aggregated (dimer, trimer, tetramer, and large cluster) state at the TPPSh-D3BJ/Def2TzVP level of theory. The calculated excited electronic state energy levels are tabulated in Table S1a–f and diagrammatically summarized in Figure a.…”

Stimulus-Responsive Organic Phosphorescence Materials Based on Small Molecular Host–Guest Doped Systems

“…Intermolecular H-bonding and halogen bonding are the major interactions to inhibit the nonradiative transitions and oxygen quenching of triplet excitons . High-performance host–guest doped materials are expected to be constructed through the emergence of molecular interactions such as ionic bonding, coordination bonding, and hydrophobic interactions. ,, Moreover, novel doped RTP systems with chirality, specific recognizability, or biological targeting can be constructed through the introduction of corresponding functional groups, which will promote the future development of intelligent response RTP materials.…”