Novel molecular design achieves 1,300-fold increase in scintillator radioluminescence

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Posted on 12/28/2024 3:51:00 PM PST by BenLurkin

Scientists from the National University of Singapore (NUS) have developed a highly effective and general molecular design that enables an enhancement in radioluminescence within organometallic scintillators by more than three orders of magnitude. This enhancement harnesses X-ray-induced triplet exciton recycling within lanthanide metal complexes.

Detection of ionizing radiation is crucial in diverse fields, such as medical radiography, environmental monitoring and astronomy. As a result, significant efforts have been dedicated to the development of luminescent materials that respond to X-rays.

However, current high-performance scintillators are almost exclusively limited to ceramic and perovskite materials, which face issues such as complex manufacturing processes, environmental toxicity, self-absorption and stability problems.

Organic phosphors present a promising alternative owing to their flexibility and cost-effectiveness. However, they are less efficient in X-ray detection because of weak X-ray absorption and limited use of molecular triplet excitons.

A research team led by Professor Liu Xiaogang from the Department of Chemistry at NUS, leveraged rare-earth X–ray absorption and ligand-mediated triplet exciton harvesting to overcome these challenges and significantly improved the performance of molecular scintillators.

The effective trapping of the energy dissipated during secondary X-ray relaxation via organic ligands led to a remarkable 1,300-fold increase in radioluminescence compared to lanthanide salts.

(Excerpt) Read more at phys.org ...

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1 posted on 12/28/2024 3:51:00 PM PST by BenLurkin

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2 posted on 12/28/2024 3:52:17 PM PST by Does so (A country about to outlaw Yellow #4 food dye, but makes Marijuana legal?...🇺🇦...Dem☭¢rat...≣ ∅)

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