Nearly Unity Quantum Yield Persistent Room‐Temperature Phosphorescence from Heavy Atom‐Free Rigid Inorganic/Organic Hybrid Frameworks

Abstract

Synergism between covalent and non-covalent bonds is employed to fix an organic phosphor guest in a rigid inorganic framework, simulating the stiffening effect seen in the glassy state and realizing efficient and ultralong roomtemperature phosphorescence (RTP). Twelve heavy-atom-free composites have been obtained through introducing arylboric or arylcarboxylic acid derivatives into the inorganic boric acid matrix by solid-phase synthesis. Owing to the stiffening effect of multiple bonds, all the composites show highly efficient and persistent RTP of guest molecules with a quantum yield ranging from 39.8 % to ca. 100 % and a lifetime up to 8.74 s, which results in a 55 s afterglow visible to the naked eye after exposure to a portable UV lamp. Interestingly, it is found that the substitution position and quantity of carboxyl in the guest have a great influence on the phosphorescent properties, and that the heavy-atom effect is invalid in such host-guest hybrid systems. The 100 g grade composite is easily prepared because of the solvent-free, green, and simple synthesis method. These results provide an important way for the development of RTP materials with ultrahigh quantum yield and ultralong lifetime, as well as their practical applications in the fields of anti-counterfeiting and information storage, among others.

Modulating Emission of Organic Emitters from Fluorescence to Red Afterglow through Boric Acid-Assisted Energy Transfer

“…39,40 The high-resolution B 1s spectrum of BA@Lev-RhB was fitted by two peaks, located at 192.7 and 193.6 eV, corresponding to B−O bonds and oxidized boron, respectively (Figure 1f). 41,42 These results confirm successful loading of Lev and RhB into the BA matrix, and the matrix is produced by the dehydration of BA, forming metaboric acid with a small portion of B 2 O 3 .…”

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

“…In recent years, organic room temperature phosphorescence (RTP) materials have been developed rapidly. 107–111 The combination of RTP and inorganic halide luminescence can also produce white-light emission of OIHPs.…”

“…(RTP) materials have been developed rapidly. [107][108][109][110][111] The combination of RTP and inorganic halide luminescence can also produce white-light emission of OIHPs. In 2018Lin's group proposed a new strategy to develop highly efficient RTP perovskites.…”