Recent progress on pure organic room temperature phosphorescent polymers

Abstract

So far, pure organic room temperature phosphorescence (RTP) materials are developing rapidly and have become a research hotspot in the scientific community. They are regarded as valuable resources with great potential for development in many fields, such as biomedicine, information multi‐level encryption, smart anti‐counterfeiting, and so on. Among them, a series of pure organic RTP polymer systems emerged at the right moment based on the excellent properties of polymers such as easy processing, low cost, and good biocompatibility. Furthermore, the huge molecular weight, long‐chain intertwined structure, and potential interactions with phosphors of polymers make them a focus for RTP emission. Herein, we describe the development history of this system in detail, explore the necessary factors for highly efficient emission from the phosphorescence emission process, and based on the dual effects of enhancing phosphorescence emission and shortening luminescence lifetime brought by heavy atoms, we summarize the internal mechanism and achievements of various researches from the perspective of heavy atom–containing and non‐heavy atom systems.

TADF‐Type Organic Afterglow

“…[30][31][32][33] Supramolecular interactions such as inclusion complexation and hydrogen bonding have also been reported to suppress the molecular vibrations of the triplet excited state of the luminescent component to increase F P of room-temperature phosphorescence and afterglow materials. [34][35][36][37][38][39][40] Besides molecular design, aggregation state control and supramolecular assembly, [41][42][43][44][45][46][47][48] two-component design strategies developed by us and other research groups, [49][50][51][52][53][54] where asecond component is employed to control the excited state properties of luminescent component (i.e., the first component), have been shown to enhance the room-temperature phosphorescence and afterglow efficiency.For example,inthe dopant-matrix system, the rigid microenvironment provided by the matrix molecules can inhibit the nonradiative deactivation of the triplet excited states of the dopant molecules, [55,56] and the deuteration of the dopant molecules can further inhibit the vibration of the triplet excited states, leading to the formation of efficient room-temperature afterglow materials. [57] In the co-crystal system, F P as high as 55 %has been achieved through the cooperation of internal and external HAE, whereas t P was reduced to approximately 10 ms. [22] In the donor-acceptor system, the excitation light can cause charge separation, while the charge recombination was strongly suppressed in solid medium, giving rising to organic long persistent luminescence (OLPL) up to hours.…”

“…Besides molecular design, aggregation state control and supramolecular assembly, [41–48] two‐component design strategies developed by us and other research groups, [49–54] where a second component is employed to control the excited state properties of luminescent component (i.e., the first component), have been shown to enhance the room‐temperature phosphorescence and afterglow efficiency. For example, in the dopant‐matrix system, the rigid microenvironment provided by the matrix molecules can inhibit the nonradiative deactivation of the triplet excited states of the dopant molecules, [55, 56] and the deuteration of the dopant molecules can further inhibit the vibration of the triplet excited states, leading to the formation of efficient room‐temperature afterglow materials [57] .…”

Tunable Linear and Nonlinear Optical Properties from Room Temperature Phosphorescent Cyclic Triimidazole‐Pyrene Bio‐Probe

“…Moreover, the development of aggregate materials with emission tunability and coexistence of multiple radiative behaviors is a burgeoning area where highly potential applications could be explored. [33,34] Here we report on the preparation and characterization of different solvated (namely TTPyr(Et) and TTPyr(Me)) and not solvated (TTPyr(RT) and TTPyr(HT)) solid phases of 3-(pyren-1-yl) triimidazo[1,2-a:1',2'-c:1'',2''-e][1,3,5]triazine hereafter TTPyr. The thermally induced structural transformation (from TTPyr(Et) to TTPyr(HT) through TTPyr(RT)) among the phases involves bright and tunable prompt and long-lived emissions as well as NLO (nonlinear optical) properties switched on by the packing features of the chromophore.…”

Halide-containing organic persistent luminescent materials for environmental sensing applications

“…supramolecular assembly. [11][12][13][14] Among them, halogen substitution has been proved to be one of the most effective design strategies. 15,16 The introduction of different halogen elements will realize OPL emission with signicantly tuneable intensity and lifetimes, making halide-containing OPL materials applicable to different environment sensing scenarios.…”