A Synergistic Enhancement Strategy for Realizing Ultralong and Efficient Room‐Temperature Phosphorescence

Abstract

An enhancement strategy is realized for ultralong bright room-temperature phosphorescence (RTP), involving polymerization between phosphor monomers and acrylamide and host-guest complexation interaction between phosphors and cucurbit[6,7,8]urils (CB[6,7,8]). The non-phosphorescent monomers exhibit 2.46 su ltralong lifetime after copolymerizing with acrylamide.T he improvement is due to the rich hydrogen bond and carbonyl within the polymers which promote intersystem crossing, suppress nonradiative relaxation and shield quencherse ffectively.B yt uning the ratio of chromophores,aseries of phosphorescent copolymers with different lifetimes and quantum yields are prepared. The complexation of macrocyclic hosts CB[6,7,8] promote the RTP of polymers by blocking aggregation-caused quenching, and offsetting the losses of aforementioned interaction provided by polymer.M ultiple lifetime-encoding for digit and character encryption are achieved by utilizing the difference of their lifetimes.

Organic phosphorescent scintillation from copolymers by X-ray irradiation

“…As a proof-of-concept experiment, we first synthesized a copolymer of PBBr-50 by free-radical copolymerization of acrylic acid (AA) and monomer 4-(allyloxy)−4′-bromo-1,1′-biphenyl (BBr) with 2-azoisobutyronitrile (AIBN) as an initiator, wherein the BBr has been frequently used as a high luminescence efficiency phosphorescent chromophore 43 – 46 (Supplementary Methods, Supplementary Fig. 2 ).…”

Excitation-Wavelength-Dependent Organic Long-Persistent Luminescence Originating from Excited-State Long-Range Proton Transfer

“…Compared with traditional monochromatic/monoscale organic materials, the Ex-De combined with LPL materials displays an on-demand change in the luminous colors and lifetime, achieving more complex data encryption. 37,42,43 Benefitting from the fascinating LPL emission and Ex-De properties of EQCN@DTT samples, a series of patterned labels have been prepared and applied for anticounterfeiting. Then, the prepared peony exhibited orange and green emission after irradiation with 365 and 254 nm UV light (Figures 4h−j and S27−S28).…”

“…In order to achieve more effective multistorage data encryptions, the extension of the traditional 2D information encryption platform has attracted considerable interest in recent years. 43 In this regard, we selected the green fluorescent material COPV and the orange fluorescent material tCAZ as confusion labels, which displayed a similar PL emission peak position to EQCN@DTT-1.5% under 254 and 365 nm UV radiation, respectively (Figure S29a,b). Then, the COPV@ DTT-1.5% and tCAZ@DTT-1.5% samples were prepared through the same method, which did not exhibit Ex-De and LPL properties (Figure S29c,d).…”

Room Temperature Phosphorescence Emission From Multi-States

“…In 2018, George et al reported a supramolecular assembly using inorganic layered silicate and bromine substituted naphthalene derivatives, which showed bright phosphorescence in dilute aqueous solution and amorphous films under ambient conditions. Liu group reported enhancement ultralong bright RTP in solution by host-guest complexation interaction between phosphors and cucurbit [6,7,8]urils (Zhang Z. Y. et al, 2020).…”