NTU Synthesizes Molecular Blue Room Temperature Phosphorescent Material

It is expected to be used in data security, encrypted ink, fingerprint recognition and other fields

It is expected to be used in data security, encrypted ink, fingerprint recognition and other fields

Sinochem's simplest molecule achieves the most excellent phosphorescence performance
.

The research team of Academician Huang Wei and Professor An Zhongfu of Nanjing University of Technology and Professor Liu Xiaogang of the National University of Singapore proposed the "chromophore confinement" strategy, which finally realized the molecular state high-efficiency blue room temperature phosphorescence

Blue light, as one of the three primary colors of light, is the core component of solid-state lighting and full-color display.
It also shows broad application prospects in the fields of biomedicine and optical communications
.

At present, a variety of blue light materials have been extensively researched and developed.

In response to the above challenges, the team based on in-depth understanding of aggregate phosphorescence and in-depth thinking on the phenomenon of solution monomolecular phosphorescence at a low temperature of 77K, based on the strong ionic bond, they creatively proposed the "chromophore confinement" strategy , Constructed an organic ion crystal material with molecular state and high-efficiency room temperature phosphorescence
.

Because the ionic bond does not have the characteristics of directionality and saturation, many counter ions can be combined around the molecule, and the chromophore is confined in a rigid, isolated environment

Based on this, the team successfully synthesized a high-efficiency blue room temperature phosphorescent ion crystal material of pyromellitic acid tetrasodium salt (TSP)
.

After light excitation, the organic ion crystal TSP presents a bright blue long afterglow phenomenon, and its life span can reach 168.

In order to further verify the "chromophore confinement" strategy to achieve the universality of molecular state high-efficiency room temperature phosphorescence, the team adjusted the counterion and chromophore unit, designed and synthesized 5 blue phosphorescent materials, 2 green phosphorescent materials and 5 All yellow phosphorescent materials realize long-life and high-efficiency room temperature phosphorescence
.

In the end, they achieved a world record blue room temperature phosphorescence of up to 96.

In view of the high-efficiency long afterglow and water-soluble characteristics of organic ionic crystals, the team prepared encryption ink based on ionic crystal TSP, and realized the application of materials in data security through inkjet printing technology
.

Under normal sunlight, encrypted information cannot be displayed; after turning off the light source, encrypted information is displayed

　　This research is of great significance for understanding the molecular structure of organic phosphorescent materials, the mechanism of stacking and the correlation mechanism of luminescence performance, and it also lays the foundation for new applications of pure organic room temperature phosphorescent materials