Journal of the American Chemical Society
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(13) Nattestad, A.; Cheng, Y. Y.; MacQueen, R. W.; Schulze, T. F.; Thomp-
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host sensitizer D1 molecules doped without aggregation, which
was confirmed by the absence of prominent shift in D1 photolumi-
nescence peak (Fig. 2a and S7, SI) and by the high UC quantum
yield of 3.1%.
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In conclusion, we demonstrate that the molecular sensitizer with
spin-forbidden yet strong S0-to-T1 absorption reduces the energy
loss during triplet sensitization and enables upconverting NIR light
beyond 900 nm to visible light. While the triplet lifetime of this
kind of sensitizer is short, the implementation of TEM-UC ap-
proach allows the efficient Dexter energy transfer to the neighbor-
ing acceptors, leading to create solid films with high UC quantum
yield and good in-air photochemical stability. This work underlines
the importance of TEM-UC concept and stimulates the exploration
of new S0-T1 absorption-type molecular sensitizers towards highly
efficient NIR-to-visible molecular upconverters, which would find
a number of applications in many disciplines.
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17 ASSOCIATED CONTENT
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Supporting Information. Experimental details, emission spectra,
XRPD patterns, excitation dependence of UC emission intensity,
UC quantum yield, emission lifetime. This material is available free
22 AUTHOR INFORMATION
23
Corresponding Authors
*yanai@mail.cstm.kyushu-u.ac.jp
*n-kimi@mail.cstm.kyushu-u.ac.jp
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Author Contributions
§These authors contributed equally.
Notes
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The authors declare no competing financial interest
30 ACKNOWLEDGMENT
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This work was partially supported by a Grants-in-Aid for Scientific
Research (S) (25220805), a Grants-in-Aid for Scientific Research
on Innovative Area (16H00844) from the Ministry of Education,
Culture Sports, Science and Technology of Japan, the JSPS-NSF
International Collaborations in Chemistry (ICC) program, and the
Asahi Glass Foundation. S.A. acknowledges the Research Fellow-
ship of Japan Society for the Promotion of Science for Young Sci-
entists.
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