Recent advances in room temperature phosphorescence materials: design strategies, internal mechanisms and intelligent optical applications

Abstract

Room temperature phosphorescence (RTP) materials comprising organic-inorganic hybrid, pure organic, and polymer RTP materials have been the research focus due to their tunable molecular structures, long emission lifetimes and extensive...

Chiral Coordination Assembly-Induced Phosphorescent Frameworks for Circularly Polarized Phosphorescence

“…Room-temperature phosphorescence with long-lived lifetimes, diversified triplet states, and large Stokes shifts has attracted extensive attention. , Currently, organic room-temperature phosphorescence (RTP) can be generated in two pathways. One is to boost the probability of coupling (SOC) through the introduction of N- or S-heterocyclic rings and heavy halogen, , which can increase intersystem crossing (ISC) rates and the amounts of triplet-state excitons, and the other aspect is to suppress the nonradiative transition of triplet-state excitons and stabilize the triplet excitons, which can be achieved through crystal engineering, polymer matrix, etc. − …”

Encapsulation engineering of porous crystalline frameworks for delayed luminescence and circularly polarized luminescence

“…28 To date, various types of host materials have been developed for delayed luminescence, such as conjugated polymers, supramolecular assemblies and liquid crystalline materials. [28][29][30][31][32] However, the preparation of these amorphous materials is sometimes unpredictable, and thus they cannot provide clear molecularscale structures showing the arrangement of host-guest systems. 33 In the case of generating CPL, many CPL-active materials have been developed.…”

Dehydration-Triggered Afterglow Transition in a Mellitate-Based Coordination Polymer

“…Long persistent luminescence (LPL) materials, also known as long afterglow materials, can be excited by visible or ultraviolet (UV) light and can maintain long-lasting luminescence after removing the light source. − Therefore, LPL materials have found applications in various fields such as safety signs, luminescent coatings, light-storage materials, biological imaging, and anti-counterfeiting. − LPL materials mainly include inorganic, organic, and metal–organic materials. − Coordination polymers are a kind of metal–organic material, possessing a highly ordered network structure constructed by coordination interactions between metal ions (or clusters) and organic ligands . With both inorganic and organic units, coordination polymers provide a platform not only for manipulating the metal species and valence states for optimization of trap energy levels and luminescent metal centers , but also to improve the luminescence efficiency and lifetime of the organic component through the interactions of crystallization induction, halogen, host–guest doping, H-aggregation, etc. − …”