Since ancient times, "Night Pearl" is considered to be a rare treasure, and its long afterglow phenomenon, which has long-term luminescence due to the inclusion of special inorganic mineral elements, is also popular among generations.
Academician Huang Wei of Nanjing University of Technology led the research team to successfully observe the long afterglow phenomenon in organic synthetic materials and developed a pure organic "night pearl". On April 6, the relevant results were published in the international top academic journal Nature and Materials.
"The single-state and triplet excited states of organic photoelectric materials, because of their high activity, their lifetimes are usually in the order of nanoseconds and milliseconds at room temperature. The short time of illumination can only be measured by precision instruments, and the human eye cannot distinguish. Academician Huang Wei said, "We have designed and prepared a series of room temperature one-component organic long-life phosphorescent materials with an excited state of life of up to a second. Not only that, but we have also created a new data encryption method. Let the encryption effect be directly observed by the naked eye."
According to reports, the team's regulation of the excited state life of pure organic materials does not require the use of any precious metals and other heavy elements; through the study of the molecular design and luminescence mechanism of related materials, it is found that the introduction of special molecular packing methods to achieve organic long afterglow Luminescence plays an important role; on this basis, the team successfully realized the organic long afterglow illuminating color from green to red, and extended the luminescence duration to 56 seconds, thus developing the world's first room temperature organic long afterglow Luminescent material.
“Organic long-life luminescent materials are a class of new materials with unique luminescence mechanisms that integrate the flexibility of organic materials with the long-lived luminescence of afterglow materials, and are used in various fields such as disease diagnosis, biological cell imaging, and currency security. Both are of great significance," said team member Associate Professor Chen Runfeng.
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