TY - JOUR
T1 - The Importance of Excited-State Energy Alignment for Efficient Exciplex Systems Based on a Study of Phenylpyridinato Boron Derivatives
AU - Mamada, Masashi
AU - Tian, Guojian
AU - Nakanotani, Hajime
AU - Su, Jianhua
AU - Adachi, Chihaya
N1 - Funding Information:
We thank Dr. W. J. Potscavage, Jr., for thorough and critical editing of the manuscript. This work was financially supported by JST ERATO Grant Number JPMJER1305 and JSPS KAKENHI Grant Number JP17K14531. G.T. thanks the China Scholarship Council for a scholarship.
Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/9/17
Y1 - 2018/9/17
N2 - Understanding excited-state dynamics is critical for improving the photoluminescence (PL) efficiency of exciplexes. A series of exciplexes based on conventional hole-transporting materials as donor and newly developed phenylpyridinato boron derivatives as acceptor were investigated. High PL efficiencies were achieved in only some combinations, and a large difference in performance among combinations provided insight into nonradiative processes in exciplex systems. Furthermore, the triplet local excited states (3LE) of each donor and acceptor were found play an important role in triplet exciplex harvesting. Significant contributions from triplets were clearly observed when the charge-transfer excited states (1CT and 3CT) and 3LE were ideally aligned. We also demonstrated fine control of relative energy alignment via the concentration to improve the PL efficiency.
AB - Understanding excited-state dynamics is critical for improving the photoluminescence (PL) efficiency of exciplexes. A series of exciplexes based on conventional hole-transporting materials as donor and newly developed phenylpyridinato boron derivatives as acceptor were investigated. High PL efficiencies were achieved in only some combinations, and a large difference in performance among combinations provided insight into nonradiative processes in exciplex systems. Furthermore, the triplet local excited states (3LE) of each donor and acceptor were found play an important role in triplet exciplex harvesting. Significant contributions from triplets were clearly observed when the charge-transfer excited states (1CT and 3CT) and 3LE were ideally aligned. We also demonstrated fine control of relative energy alignment via the concentration to improve the PL efficiency.
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U2 - 10.1002/anie.201804218
DO - 10.1002/anie.201804218
M3 - Article
C2 - 30062688
AN - SCOPUS:85052815161
SN - 1433-7851
VL - 57
SP - 12380
EP - 12384
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 38
ER -