TY - JOUR
T1 - Thermally Activated Delayed Fluorescence Carbonyl Derivatives for Organic Light-Emitting Diodes with Extremely Narrow Full Width at Half-Maximum
AU - Li, Xing
AU - Shi, Yi Zhong
AU - Wang, Kai
AU - Zhang, Ming
AU - Zheng, Cai Jun
AU - Sun, Dian Ming
AU - Dai, Gao Le
AU - Fan, Xiao Chun
AU - Wang, De Qi
AU - Liu, Wei
AU - Li, Yan Qing
AU - Yu, Jia
AU - Ou, Xue Mei
AU - Adachi, Chihaya
AU - Zhang, Xiao Hong
N1 - Funding Information:
This work was supported by the National Key Research & Development Program of China (grant number 2016YFB0401002), the National Natural Science Foundation of China (grant numbers 51533005, 51821002, 51773029, and 51373190), the China Postdoctoral Science Foundation (grant numbers 2018M642307 and 2016M590498), the Jiangsu Planned Projects for Postdoctoral Research Funds (grant number 1601241C), Collaborative Innovation Center of Suzhou Nano Science & Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the 111 Project and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/4/10
Y1 - 2019/4/10
N2 - Two novel thermally activated delayed fluorescence (TADF) emitters, 3-phenylquinolino[3,2,1-de]acridine-5,9-dione (3-PhQAD) and 7-phenylquinolino[3,2,1-de]acridine-5,9-dione (7-PhQAD), were designed and synthesized based on a rigid quinolino[3,2,1-de]acridine-5,9-dione (QAD) framework. With the effective superimposed resonance effect from electron-deficient carbonyls and electron-rich nitrogen atom, both emitters realize significant TADF characteristics with small ΔE ST s of 0.18 and 0.19 eV, respectively. And, molecular relaxations were dramatically suppressed for both emitters because of their conjugated structure. In the devices, 3-PhQAD realizes superior performance with a maximum external quantum efficiency (EQE) of 19.1% and a narrow full width at half-maximum (FWHM) of 44 nm, whereas a maximum EQE of 18.7% and an extremely narrow FWHM of 34 nm are realized for 7-PhQAD. These superior results reveal that apart from nitrogen and boron-aromatic systems, QAD framework can also act as a TADF matrix with effective resonance effect, and QAD derivatives are ideal candidates to develop TADF emitters with narrow FWHMs for practical applications.
AB - Two novel thermally activated delayed fluorescence (TADF) emitters, 3-phenylquinolino[3,2,1-de]acridine-5,9-dione (3-PhQAD) and 7-phenylquinolino[3,2,1-de]acridine-5,9-dione (7-PhQAD), were designed and synthesized based on a rigid quinolino[3,2,1-de]acridine-5,9-dione (QAD) framework. With the effective superimposed resonance effect from electron-deficient carbonyls and electron-rich nitrogen atom, both emitters realize significant TADF characteristics with small ΔE ST s of 0.18 and 0.19 eV, respectively. And, molecular relaxations were dramatically suppressed for both emitters because of their conjugated structure. In the devices, 3-PhQAD realizes superior performance with a maximum external quantum efficiency (EQE) of 19.1% and a narrow full width at half-maximum (FWHM) of 44 nm, whereas a maximum EQE of 18.7% and an extremely narrow FWHM of 34 nm are realized for 7-PhQAD. These superior results reveal that apart from nitrogen and boron-aromatic systems, QAD framework can also act as a TADF matrix with effective resonance effect, and QAD derivatives are ideal candidates to develop TADF emitters with narrow FWHMs for practical applications.
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U2 - 10.1021/acsami.8b19635
DO - 10.1021/acsami.8b19635
M3 - Article
C2 - 30892014
AN - SCOPUS:85064192327
VL - 11
SP - 13472
EP - 13480
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 14
ER -