TY - JOUR
T1 - Near-Infrared-to-Visible Photon Upconversion Sensitized by a Metal Complex with Spin-Forbidden yet Strong S0-T1 Absorption
AU - Amemori, Shogo
AU - Sasaki, Yoichi
AU - Yanai, Nobuhiro
AU - Kimizuka, Nobuo
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Scientific Research (S) (25220805), a Grant-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 Fellowship from the Japan Society for the Promotion of Science for Young Scientists
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/7/20
Y1 - 2016/7/20
N2 - Near-infrared (NIR)-to-visible (vis) photon upconversion (UC) is useful for various applications; however, it remains challenging in triplet-triplet annihilation-based UC, mainly due to the energy loss during the S1-to-T1 intersystem crossing (ISC) of molecular sensitizers. In this work, we circumvent this energy loss by employing a sensitizer with direct S0-to-T1 absorption in the NIR region. A mixed solution of an osmium complex having a strong S0-T1 absorption and rubrene emitter upconverts NIR light ( = 938 nm) to visible light ( = 570 nm). Sensitizer-doped emitter nanoparticles are prepared by re-precipitation and dispersed into an oxygen-barrier polymer. The obtained composite film shows a stable NIR-to-vis UC emission based on triplet energy migration (TEM), even in air. A high UC quantum yield of 3.1% is observed for this TEM-UC system, expanding the scope of molecular sensitizers for NIR-to-vis UC.
AB - Near-infrared (NIR)-to-visible (vis) photon upconversion (UC) is useful for various applications; however, it remains challenging in triplet-triplet annihilation-based UC, mainly due to the energy loss during the S1-to-T1 intersystem crossing (ISC) of molecular sensitizers. In this work, we circumvent this energy loss by employing a sensitizer with direct S0-to-T1 absorption in the NIR region. A mixed solution of an osmium complex having a strong S0-T1 absorption and rubrene emitter upconverts NIR light ( = 938 nm) to visible light ( = 570 nm). Sensitizer-doped emitter nanoparticles are prepared by re-precipitation and dispersed into an oxygen-barrier polymer. The obtained composite film shows a stable NIR-to-vis UC emission based on triplet energy migration (TEM), even in air. A high UC quantum yield of 3.1% is observed for this TEM-UC system, expanding the scope of molecular sensitizers for NIR-to-vis UC.
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U2 - 10.1021/jacs.6b04692
DO - 10.1021/jacs.6b04692
M3 - Article
AN - SCOPUS:84979256998
SN - 0002-7863
VL - 138
SP - 8702
EP - 8705
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 28
ER -