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Creators/Authors contains: "Miyashita, Tsumugi"

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  1. ; ; ; ; ( , The Journal of Physical Chemistry C)
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  2. ; ; ; ; ( , The Journal of Physical Chemistry Letters)
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  3. ; ; ; ; ( , RSC Advances)
    Here, films using CdSe nanocrystal (NC) triplet photosensitizers in conjunction with diphenylanthracene (DPA) emitters were assembled to address several challenges to practical applications for solution-based photon upconversion. By using poly(9-vinylcarbazole) as a phosphorescent host in this film, volatile organic solvents are eliminated, the spontaneous crystallization of the emitter is significantly retarded, and ∼1.5% photon upconversion quantum yield (out of a maximum of 50%) is obtained. Transient absorption spectroscopy on nanosecond-to-microsecond time scales reveals this efficiency is enabled by an exceptionally long triplet lifetime of 3.4 ± 0.3 ms. Ultimately, we find the upconversion efficiency is limited by incomplete triplet–triplet annihilation, which occurs with a rate 3–4 orders of magnitude slower than in solution-phase upconversion systems. 
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  4. ; ; ; ; ( , The Journal of Chemical Physics)