Amorphous Pure Organic Polymers for Heavy‐Atom‐Free Efficient Room‐Temperature Phosphorescence Emission

Abstract

Pure organic, heavy-atom-free room-temperature phosphorescence (RTP) materials have attracted much attention and have potential applications in photoelectric and biochemical material fields owing to their rich excited state properties. They offer long luminescent lifetime, diversified design, and facile preparation. However, recent achievements of efficient phosphorescence under ambient conditions mainly focus on ordered crystal lattices or embedding into rigid matrices, which require strict growth conditions and have poor reproducibility. Herein, we developed a concise approach to give RTP with a decent quantum yield and ultralong phosphorescence lifetime in the amorphous state by radical binary copolymerization of acrylamide and different phosphors with oxygen-containing functional groups. The cross-linked hydrogen-bonding networks between the polymeric chains immobilize phosphors to suppress non-radiative transitions and provide a microenvironment to shield quenchers.

Manipulating the Stacking of Triplet Chromophores in the Crystal Form for Ultralong Organic Phosphorescence

“…[2] To obtain UOP materials,t remendous efforts have been devoted:1)the introduction of heavy halogen atoms,a romatic carbonyl groups,o ro ther substituents to accelerate intersystem crossing (ISC) between singlet and triplet excited states,a nd 2) providing ar igid molecular environment to suppress the nonradiation transitions and favoring UOP emission. [3] Among the reported strategies, such as polymerization and host-guest doping methods,etc., [4] crystal engineering is indispensable for obtaining UOP, because molecular motions can be efficiently restricted in ar igid crystal environment. [5] In this context, the analysis of molecular packing in acrystal is crucial for understanding the UOP generation.…”

Carbon Dots with Dual‐Emissive, Robust, and Aggregation‐Induced Room‐Temperature Phosphorescence Characteristics

“…[63][64][65] Such aggregation would not only play an important role for stabilizing the T 1 excited state of the TA-CDs,b ut also form another triplet excited state (T 1 *) ( Figure 4f)t hat probably being produced by delocalization among several neighboring T 1 emission relevant moieties. [7,66] It is known that most of the currently reported organic RTPmaterials are only observable in crystalline or composite forms (that is,embedding in matrices), [6][7][8][9] which significantly limit their applications.F or instance,t he carbon precursor used in this study (namely,t rimellitic acid) shows such RTP properties (Supporting Information, Figure S19). Therefore, the achievement of grinding-tolerant (or amorphous) metalfree RTPm aterials is very challenging,b ut highly desirable.…”

“…Room‐temperature phosphorescence (RTP) materials have attracted much attention in recent years owing to their scientific significance and superior performance in many fields of applications, including bioimaging, optoelectronic devices, and information security/protection . Most of the reported pure organic RTP materials, however, are observable only in their crystalline or composite forms (such as embedding in matrices), which greatly limit their applications . Therefore, the development of robust (or grinding‐tolerant) metal‐free RTP materials is highly desirable …”

Modulation of Thermally Activated Delayed Fluorescence in Waterborne Polyurethanes via Charge‐Transfer Effect

“…In order to restrain thermal quenching of triplet excitons, luminogens have to be prepared as crystals or incorporated in polymers . Waterborne polyurethane (WPU) is a kind of polymer with tunable soft and hard segments, which has a satisfactory film‐forming property and has been widely used as coatings, leathers, textiles, and matrices for functional materials .…”

“…In order to restraint hermal quenching of triplet excitons, luminogens have to be prepared as crystals or incorporated in polymers. [36][37][38][39][40][41][42] Waterbornep olyurethane (WPU) is ak ind of polymer with tunable soft and hard segments, which has as atisfactory film-formingp roperty and has been widelyu sed as coatings, [43] leathers, [44] textiles, [45] and matrices for functional materials. [46][47][48] Compared to terminal-functional polymers, like polylactides( PLAs), luminogens covalently incorporated in WPU main chain via polyadditionr eactions uffer less aggregation of luminogens in that luminogens in the main chains have smallerf ree volumes.…”