TY - JOUR
T1 - Excited-State Modulation of Aggregation-Induced Emission Molecules for High-Efficiency Triplet Exciton Generation
AU - Dai, Wenbo
AU - Bianconi, Tommaso
AU - Ferraguzzi, Elena
AU - Wu, Xinghui
AU - Lei, Yunxiang
AU - Shi, Jianbing
AU - Tong, Bin
AU - Carlotti, Benedetta
AU - Cai, Zhengxu
AU - Dong, Yuping
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/12/6
Y1 - 2021/12/6
N2 - Restriction of intramolecular motion (RIM) is commonly adopted to achieve high luminescence for aggregation-induced emission (AIE) materials. However, recent studies found that RIM cannot fully explain the behavior of some new systems because of the existence of extra nonradiative excited state channels. In this work, two D-π-A type molecules, TPA-P-C and CBZ-P-C with AIE properties, were prepared via the Suzuki-Miyaura reaction. CBZ-P-C showed an unusual solvent effect, being nonemissive in low-polar solvents but highly emissive in polar solvents. Theoretical calculations and time-resolved spectroscopic experiments demonstrated for CBZ-P-C a quantitative intersystem crossing (ISC) in low-polar solvents, resulting in low emission quantum yield but high singlet oxygen generation. In addition, a rigid matrix (triphenylphosphine (TPP)) was selected as host for the stabilization of the triplet excitons. Both doping materials showed high room-temperature phosphorescence (RTP) as a consequence of the highly efficient triplet exciton generation. The present study provides a new insight for understanding AIE materials and paves an easy yet efficient way for the excited-state modulation of AIE molecules.
AB - Restriction of intramolecular motion (RIM) is commonly adopted to achieve high luminescence for aggregation-induced emission (AIE) materials. However, recent studies found that RIM cannot fully explain the behavior of some new systems because of the existence of extra nonradiative excited state channels. In this work, two D-π-A type molecules, TPA-P-C and CBZ-P-C with AIE properties, were prepared via the Suzuki-Miyaura reaction. CBZ-P-C showed an unusual solvent effect, being nonemissive in low-polar solvents but highly emissive in polar solvents. Theoretical calculations and time-resolved spectroscopic experiments demonstrated for CBZ-P-C a quantitative intersystem crossing (ISC) in low-polar solvents, resulting in low emission quantum yield but high singlet oxygen generation. In addition, a rigid matrix (triphenylphosphine (TPP)) was selected as host for the stabilization of the triplet excitons. Both doping materials showed high room-temperature phosphorescence (RTP) as a consequence of the highly efficient triplet exciton generation. The present study provides a new insight for understanding AIE materials and paves an easy yet efficient way for the excited-state modulation of AIE molecules.
UR - http://www.scopus.com/inward/record.url?scp=85119963710&partnerID=8YFLogxK
U2 - 10.1021/acsmaterialslett.1c00528
DO - 10.1021/acsmaterialslett.1c00528
M3 - Article
AN - SCOPUS:85119963710
SN - 2639-4979
VL - 3
SP - 1767
EP - 1777
JO - ACS Materials Letters
JF - ACS Materials Letters
IS - 12
ER -