Organic Long-Persistent Luminescence from a Single-Component Aggregate

Abstract

Long-persistent luminescence (LPL), also known as afterglow, is a phenomenon in which the material shows long-lasting luminescence after the cessation of the excitation source. The research of LPL continues to attract much interest due to its fundamental nature and its potential in the development of the next generation of functional materials. However, most of the current LPL materials are multicomponent inorganic systems obtained after harsh synthetic procedures and often use rare-earth metals. Recently, metal free organic long-persistent luminescence (OLPL) has gained much interest because it can bypass many of the disadvantages of inorganic systems. To date, the most successful method to generate OLPL systems is to access charge-separated states through binary donor–acceptor exciplex systems. However, it has been reported that the ratios of the binary systems affect OLPL properties, complicating the reproducibility and large-scale production of OLPL materials. Simpler OLPL systems can overcome these issues for the benefit of the development and adoption of OLPL systems. Here, we report on the rational design and synthesis of a single-component OLPL system with detectable afterglow for at least 12 min under ambient conditions. This work exemplifies an easy design principle for new OLPL materials. The investigation of the material provides valuable insights toward the generation of OLPL from a single-component system.

Manipulation of Triplet Excited States in Two‐Component Systems for High‐Performance Organic Afterglow Materials

“…Taking advantage of the strong inhibition of charge recombination process within crystalline lattices, the materials exhibited very long afterglow durations up to 7 h [52] . In a very recent study, by merging amine groups and phosphonium salt groups into one single molecules, OLPL materials can still be obtained after recrystallization to display at least 12 min afterglow duration under ambient conditions [83] …”

“…Taking advantage of the strong inhibition of charge recombination process within crystalline lattices, the materials exhibited very long afterglow durations up to 7 h. [52] In a very recent study, by merging amine groups and phosphonium salt groups into one single molecules, OLPL materials can still be obtained after recrystallization to display at least 12 min afterglow duration under ambient conditions. [83] Li and coworkers developed donor-acceptor afterglow materials by using very simple organic substances. By doping 10-methyl-10H-phenothiazine into 10-methyl-10H-phenothiazine 5,5-dioxide, the obtained materials showed OLPL properties under ambient conditions.…”

Synthesis and excited state modulation of organic blue light emitters based on 2,4,6-triphenyl-1,3,5-triazine and carbazole derivatives through ortho-positioned linking models

“…S30 (ESI†), which shielded light on the potential H-aggregate in the OTrPhCz and OSTrPhCz solid, and the decrease in the UV-vis absorption intensity of OSTrPhCz between 262–270 nm with increasing water contents is more pronounced than those of OTrPhCz , which further strengthens the unique contribution of the triclinic crystal structure to the observed RTP luminescence. 41–43 Also, with the temperatures gradually decreasing from room temperature to 77 K, the long-wavelength emission peaks of emitters OSTrPhCz , OTrPhCz and OTrPhCzBr in the solid powder states are gradually intensified (Fig. 8), which further verify the RTP properties in the crystals.…”

Highly efficient organic long persistent luminescence based on host–guest doping systems

“…Except for lifetime, quantum yield is another essential performance parameter of OLPL system for its various potential applications to ensure the OLPL signal can be detected not only by instrument but also by naked eyes. Although some progress Please do not adjust margins Please do not adjust margins has been made in the field of OLPL [33][34][35][36][37] in recent years, low quantum yield and expensive prepared cost are still presented in most reported OLPL systems, and how to develop facilely prepared OLPL materials with high quantum yield has been still an urgent challenge to be overcome.…”