TY - JOUR
T1 - Efficiency of Thermally Activated Delayed Fluorescence Sensitized Triplet Upconversion Doubled in Three-Component System
AU - Yurash, Brett
AU - Dixon, Alana
AU - Espinoza, Carolina
AU - Mikhailovsky, Alexander
AU - Chae, Sangmin
AU - Nakanotani, Hajime
AU - Adachi, Chihaya
AU - Nguyen, Thuc Quyen
N1 - Funding Information:
This project was supported by the Department of the Navy, Office of Naval Research (Award No. N000142112181). C.E. thanks the Gene & Susan Lucas undergraduate research fellowship and the Research Internships in Science and Engineering (RISE). The material synthesis was partly supported by JSPS core to core program in Japan.
Publisher Copyright:
© 2021 Wiley-VCH GmbH.
PY - 2021
Y1 - 2021
N2 - As in many fields, the most exciting endeavors in photon upconversion research focus on increasing the efficiency (upconversion quantum yield) and performance (anti-Stokes shift) while diminishing the cost of production. In this vein, studies employing metal-free thermally activated delayed fluorescence (TADF) sensitizers have garnered increased interest. Here, for the first time, the strategy of ternary photon upconversion is utilized with the TADF sensitizer 2,4,5,6-tetrakis(carbazol-9-yl)isophthalonitrile (4CzIPN), resulting in a doubling of the upconversion quantum yield in comparison to the binary system employing p-terphenyl as the emitter. In this ternary blend, the sensitizer 4CzIPN is paired with an intermediate acceptor, 1-methylnaphthalene, in addition to the emitter molecule, p-terphenyl, yielding a normalized upconversion quantum yield of 7.6% while maintaining the 0.83 eV anti-Stokes shift. These results illustrate the potential benefits of utilizing this strategy of energy-funneling, previously used only with heavy-metal based sensitizers, to increase the performance of these photon upconversion systems.
AB - As in many fields, the most exciting endeavors in photon upconversion research focus on increasing the efficiency (upconversion quantum yield) and performance (anti-Stokes shift) while diminishing the cost of production. In this vein, studies employing metal-free thermally activated delayed fluorescence (TADF) sensitizers have garnered increased interest. Here, for the first time, the strategy of ternary photon upconversion is utilized with the TADF sensitizer 2,4,5,6-tetrakis(carbazol-9-yl)isophthalonitrile (4CzIPN), resulting in a doubling of the upconversion quantum yield in comparison to the binary system employing p-terphenyl as the emitter. In this ternary blend, the sensitizer 4CzIPN is paired with an intermediate acceptor, 1-methylnaphthalene, in addition to the emitter molecule, p-terphenyl, yielding a normalized upconversion quantum yield of 7.6% while maintaining the 0.83 eV anti-Stokes shift. These results illustrate the potential benefits of utilizing this strategy of energy-funneling, previously used only with heavy-metal based sensitizers, to increase the performance of these photon upconversion systems.
UR - http://www.scopus.com/inward/record.url?scp=85121105657&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85121105657&partnerID=8YFLogxK
U2 - 10.1002/adma.202103976
DO - 10.1002/adma.202103976
M3 - Article
C2 - 34793602
AN - SCOPUS:85121105657
SN - 0935-9648
JO - Advanced Materials
JF - Advanced Materials
ER -