摘要
The integration of multiple chromophore units into a single molecule is expected to improve the performance of photon upconversion based on triplet−triplet annihilation(TTA-UC)that can convert low energy photons to higher energy photons at low excitation intensity.In this study,a macrocyclic parallel dimer of 9,10-diphenylanthracene(DPA)with a precisely parallel orientation,named MPD-2,is synthesized,and its TTAUC properties are investigated.MPD-2 shows a green-to-blue TTA-UC emission in the presence of a triplet sensitizer,platinum octaethylporphyrin(PtOEP).Compared to monomeric DPA,MPD-2 results in an enhancement of the spin statistical factor of TTA and a decrease in the excitation light intensity due to the intramolecular TTA process.The obtained structure−property relationship provides important information for the further improvement of TTA-UC properties.
基金
supported by the JST START(JPMJSF2303)
JSPS KAKENHI(JP23H00304,JP22KF0295,JP23KJ1717)
Kyushu University Platform of Inter-/Transdisciplinary Energy Research(Q-PIT)through its“Module-Research Program”
Kyushu University Integrated Initiative for Designing Future Society.
