| 研究実績の概要 |
I established a triplet-triplet annihilation photon upconversion (TTA-UC) system based the composites of organic molecules and inorganic quantum dots (QDs). 5-(4-Carboxyphenyl)-10,15,20-triphenylporphyrin (TPP) molecules were assembled on the surface of PbS QDs for upconverting near infrared (NIR) into visible light. During UC process, PbS QDs are excited by a laser pulse and engages in interfacial triplet energy transfer to surface-attached TPP to generate TPP in the triplet excited state (TPP (T1)). Successive TTET then occurs from TPP (T1) to 2,5,8,11-tetra-tert-butylperylene (TTBP) molecules dissolved in the solution, which act as an annihilator. Then, two TTBP (T1) undergo TTA-UC to produce a singlet that emits a higher-energy photon.
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