TY - JOUR
T1 - Exciton Recycling in Triplet Energy Transfer from a Defect-Rich Quantum Dot to an Organic Molecule
AU - Zhang, Jie
AU - Chiga, Yuki
AU - Kouno, Hironori
AU - Yanai, Nobuhiro
AU - Kimizuka, Nobuo
AU - Teranishi, Toshiharu
AU - Sakamoto, Masanori
N1 - Funding Information:
The authors thank Prof. Hirokazu Tahara for the fruitful discussions on Auger-assisted physical phenomena. The authors thank Hirohiko Watanabe (Hamamatsu Photonics) for the support with emission measurements at 77 K. This study was supported by KAKENHI JP21H04638 (Grant-in-Aid for Scientific Research [A]) [M.S.], Grant Numbers JP16H06520 [Coordination Asymmetry] (T.T.), JP16H06513 (N.K.), JP17H05257 (Photosynergetics) (M.S.), and 19J14834 (JSPS Research Fellowship) (J.Z.). This work was supported by the JST FOREST Programme (Grant Number PMJFR201M) [M.S.].
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/7/21
Y1 - 2022/7/21
N2 - Surface defects are pervasive in quantum dots (QDs) and are detrimental to their applications. The recycling of trapped excitons is key for the efficient utilization of QDs, while the strategy for this is limited. Here, we discovered a unique recycling process for deep trapped excitons in molecule-coordinated defect-rich QD systems. Triplet-triplet energy transfer (TTET) from defect-rich QDs to surface-attached perylene-3-carboxylic acid (Pe) was investigated at a low temperature (77 K), and the contribution of defect state was suggested the Auger-assisted recycling process of the defect-trapped carriers, having insufficient energy for TTET. The discovery of TTET via exciton recycling from defects provides a new way to reuse untapped excitons in QDs and QD devices.
AB - Surface defects are pervasive in quantum dots (QDs) and are detrimental to their applications. The recycling of trapped excitons is key for the efficient utilization of QDs, while the strategy for this is limited. Here, we discovered a unique recycling process for deep trapped excitons in molecule-coordinated defect-rich QD systems. Triplet-triplet energy transfer (TTET) from defect-rich QDs to surface-attached perylene-3-carboxylic acid (Pe) was investigated at a low temperature (77 K), and the contribution of defect state was suggested the Auger-assisted recycling process of the defect-trapped carriers, having insufficient energy for TTET. The discovery of TTET via exciton recycling from defects provides a new way to reuse untapped excitons in QDs and QD devices.
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U2 - 10.1021/acs.jpcc.2c03107
DO - 10.1021/acs.jpcc.2c03107
M3 - Article
AN - SCOPUS:85135213311
SN - 1932-7447
VL - 126
SP - 11674
EP - 11679
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 28
ER -