DOI: https://doi.org/10.29363/nanoge.emlem.2024.001
Publication date: 13th July 2024
The scintillation mechanism in organic scintillator relies on a cascade of energy transfers from the organic matrix to the last wavelength shifter. The last transfer is the least efficient one due to the low concentration in the final emitter. To address this challenge, the distance between the final emitter and the primary dye should be reduced. Nonetheless, this cannot be achieved by increasing the overall final-emitter concentration as this would lead to self-reabsorption. Therefore, the challenge is to increase the local concentration of the final emitter only in the close vicinity of the last energy donor. We archived this in perovskite nanostructure organic scintillators by binding the organic acceptor directly on the surface of the perovskite nanocrystal. To measure the binding effect on the energy transfer efficiency, a side-by-side comparison of two scintillators was performed. The first one had the chromophore bound to the perovskite and the second contained the same amount of chromophore homogeneously dispersed. The binding resulted in a four-fold enhancement of the energy transfer efficiency, along with a shortening of the scintillator response time. These observations were attributed to the favoring of a Förster mechanism over the trivial energy transfer. Based on the observations we conclude that actively managing the distance between the wavelength shifters is desirable to increase the overall scintillator performance and foresee the binding strategy as transferable to other nanostructure scintillators.
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