TY - JOUR
T1 - Achieving highly efficient near-ultraviolet emitters via optimizing molecular configuration by the intramolecular-locked donor and acceptor
AU - Zhong, Daokun
AU - Yang, Xiaolong
AU - Deng, Xuming
AU - Chen, Xi
AU - Sun, Yuling
AU - Tao, Peng
AU - Li, Zikang
AU - Zhang, Jie
AU - Zhou, Guijiang
AU - Wong, Wai Yeung
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (52161145411, 22175137, 21875179, 21602170 and 51803163), the Natural Science Foundation of Shaanxi Province (2019JZ-29 and 2019JQ-188), the China Postdoctoral Science Foundation (2016M600778), the Fundamental Research Funds for the Central Universities (xjj2017099, xjj2016061 and cxtd2015003). The National Key R&D Program of China (2022YFE0104100), National Natural Science Foundation of China (61905120, 51873176, 21875179, 22175137, and 21373160), Start-up Fund for RAPs under the Strategic Hiring Scheme (P0035922), ITC Guangdong-Hong Kong Technology Cooperation Funding Scheme (TCFS) (GHP/038/19GD), CAS-Croucher Funding Scheme for Joint Laboratories (ZH4A), the Hong Kong Research Grants Council (PolyU 15305320). The characterization assistance from the Instrument Analysis Center of Xi'an Jiaotong University is also acknowledged.
Funding Information:
This work was supported by the National Natural Science Foundation of China (52161145411, 22175137, 21875179, 21602170 and 51803163), the Natural Science Foundation of Shaanxi Province (2019JZ-29 and 2019JQ-188), the China Postdoctoral Science Foundation (2016M600778), the Fundamental Research Funds for the Central Universities (xjj2017099, xjj2016061 and cxtd2015003). The National Key R&D Program of China (2022YFE0104100), National Natural Science Foundation of China (61905120, 51873176, 21875179, 22175137, and 21373160), Start-up Fund for RAPs under the Strategic Hiring Scheme (P0035922), ITC Guangdong-Hong Kong Technology Cooperation Funding Scheme (TCFS) (GHP/038/19GD), CAS-Croucher Funding Scheme for Joint Laboratories (ZH4A), the Hong Kong Research Grants Council (PolyU 15305320). The characterization assistance from the Instrument Analysis Center of Xi’an Jiaotong University is also acknowledged.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/15
Y1 - 2023/1/15
N2 - In this work, three D-A-locked near-ultraviolet (NUV) emitters (DPhPO-Oz, DPhPO-Ad and DPhPO-Tz) with atypical planar structures were synthesized by an intramolecular-locked of donor and acceptor (D and A) units. They adopt triphenylphosphine oxide (TPhPO) moiety as accepter, which can improve the electron injection and transportation, reduce the LUMO energy level to widen the bandgap and limit the emission red-shift. By locking the D and A units got D-A-locked emitters with atypical planar structure. This atypical planar structure can increase molecular rigidity and reduce the non-radiative decay of the D-A-locked emitters. It also can increase the PLQY and decrease the intermolecular π–π stacking. The highest PLQY of the D-A-locked emitters is 0.64. Due to their atypical planar structure, all of the three emitters show blue-shifted emission and narrower FHWM with the Commission Internationale de L'Eclairage (CIEy) ≤ 0.03 in toluene solution. In order to further investigate the effect of the atypical planar configurations of the molecules on their emissions. Three additional D-locked emitters (TPhPO-Oz, TPhPO-Ad and TPhPO-Tz) with distinct D-A structures were synthesized. Although the D-locked emitters can also show near-ultraviolet emission with narrow FHWM in toluene, they still exhibit red-shift and wider FHWM in their emission spectra with respect to the D-A-locked emitters. These results indicate that the shorter emission wavelength in the D-A-locked emitters with narrow FHWM should be due to their atypical planar structure. As the above consequence, the NUV organic light-emitting diodes based on DPhPO-Ad can achieve forward-viewing maximum external quantum efficiency (ηext) of 4.58 % with electroluminescence (EL) at 404 nm, CIEy coordinate at 0.05 and narrow FHWM (54 nm).
AB - In this work, three D-A-locked near-ultraviolet (NUV) emitters (DPhPO-Oz, DPhPO-Ad and DPhPO-Tz) with atypical planar structures were synthesized by an intramolecular-locked of donor and acceptor (D and A) units. They adopt triphenylphosphine oxide (TPhPO) moiety as accepter, which can improve the electron injection and transportation, reduce the LUMO energy level to widen the bandgap and limit the emission red-shift. By locking the D and A units got D-A-locked emitters with atypical planar structure. This atypical planar structure can increase molecular rigidity and reduce the non-radiative decay of the D-A-locked emitters. It also can increase the PLQY and decrease the intermolecular π–π stacking. The highest PLQY of the D-A-locked emitters is 0.64. Due to their atypical planar structure, all of the three emitters show blue-shifted emission and narrower FHWM with the Commission Internationale de L'Eclairage (CIEy) ≤ 0.03 in toluene solution. In order to further investigate the effect of the atypical planar configurations of the molecules on their emissions. Three additional D-locked emitters (TPhPO-Oz, TPhPO-Ad and TPhPO-Tz) with distinct D-A structures were synthesized. Although the D-locked emitters can also show near-ultraviolet emission with narrow FHWM in toluene, they still exhibit red-shift and wider FHWM in their emission spectra with respect to the D-A-locked emitters. These results indicate that the shorter emission wavelength in the D-A-locked emitters with narrow FHWM should be due to their atypical planar structure. As the above consequence, the NUV organic light-emitting diodes based on DPhPO-Ad can achieve forward-viewing maximum external quantum efficiency (ηext) of 4.58 % with electroluminescence (EL) at 404 nm, CIEy coordinate at 0.05 and narrow FHWM (54 nm).
KW - Atypical planar molecular structure
KW - Highly efficient near-ultraviolet emission
KW - Locked donor–acceptor groups
KW - Near-ultraviolet emitters
KW - Organic light-emitting diode
UR - http://www.scopus.com/inward/record.url?scp=85139211944&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.139480
DO - 10.1016/j.cej.2022.139480
M3 - Journal article
AN - SCOPUS:85139211944
SN - 1385-8947
VL - 452
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - Part 3
M1 - 139480
ER -