Ultralong Polymeric Room Temperature Phosphorescence Materials Fabricated by Multiple Hydrogen Bondings Resistant to Temperature and Humidity

Abstract

Polymeric room temperature phosphorescence (RTP) materials have attracted tremendous attentions owing to their excellent flexibility, easy processing, low cost, and good thermal stability. In this work, an improved strategy is proposed for ultralong RTP polymeric materials through copolymerizing the phosphor monomer with D (donor)−A (acceptor) structure and another monomer with ultrastrong multiple hydrogen bonds. A series of copolymers (P1–P4) containing different ratios of carbazole‐dibenzofuran (CDF) and ureidopyrimidinone (UPy) segments are successfully prepared. The obtained copolymers show ultralong phosphorescence lifetimes between 1.70 and 2.16 s with afterglow duration time between 15 and 17 s. The multiple hydrogen bonds of UPy groups can promote extremely intermolecular and intramolecular interactions, which immobilize the phosphors to prevent nonradiative transitions. Especially, these interactions lead to the copolymers can be robustly resistant to high temperature and humidity. Flexible and foldable anti‐counterfeiting with high temperature and humidity resistant features are achieved, which would be applied in practical special environments.

High temperature shape memory poly(amide-imide)s with strong mechanical robustness

“…5b, the amide carbonyl stretches at 1684 cm −1 and it gradually moves to 1691 cm −1 with an overall variation of 7 cm −1 when the temperature is raised up to 339 °C, also testifying to the increasing bond order owing to the presence of free amide carbonyls with the increase of temperature. 55,[65][66][67][68][69] Notably, similar blue shifts can also be observed in the m-3FPAI sample (Fig. S38, ESI †), while stretching vibrations of the imide carbonyl group remain almost constant at any temperature in the PI-R3 reference sample (Fig.…”

“…54 To make the amide hydrogen bonding visible, in situ variable temperature infrared spectroscopy IR (VT-IR) measurements were performed on select PAI and reference samples. As is indicated in a few spectroscopic investigations about amide-containing polymers, 55,[65][66][67][68][69] the hydrogen bonding is weakened or even disrupted at elevated temperature, consequently leading to a blue shift (moving to a larger wavenumber) of the amide carbonyl and amide N-H bond…”

Metal‐Free Organic Triplet Emitters with On–Off Switchable Excited State Intramolecular Proton Transfer

“…The exact origin of this unexpectedly high Φ ph is unknown but may shine light on the benefit of PAA as a great yet overlooked matrix for triplet emitters: 1) PAA serves as a good oxygen barrier due to the large density of hydrogen bonds. In PAA, τ ph in air is almost the same as that in anoxic conditions, which is quite the opposite in PMMA (Figure 2c); 2) PAA could establish multiple hydrogen bonds with our ESIPT molecules, which helps prevent triplet excitons from decaying non-radiatively-a strategy widely used in organic RTP emitters; [46][47][48] 3) The presented results suggest a potential synergic effect between Br and PAA with the enol form only. We are currently reviewing the origin of this effect.…”

Supramolecular Self-Assembly of Atomically Precise Silver Nanoclusters with Chiral Peptide for Temperature Sensing and Detection of Arginine

“…However, temperature sensors based on metal NCs are mainly concentrated in solution and gel states, while solid-state temperature sensors are rarely explored. In addition, most solid-state phosphorescent temperature sensing materials have poor photoluminescence capabilities at high temperatures, and the fluorescence generally disappears when the temperature is higher than 100 °C [ 38 , 39 , 40 ]. Therefore, it is particularly important to develop a solid material with good photoluminescence ability at high temperature.…”