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 - 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.
KW - narrow full width at half-maximum
KW - organic light-emitting diodes
KW - resonance effect
KW - rigid framework
KW - thermally activated delayed fluorescence
UR - https://www.scopus.com/pages/publications/85064192327
U2 - 10.1021/acsami.8b19635
DO - 10.1021/acsami.8b19635
M3 - 文章
C2 - 30892014
AN - SCOPUS:85064192327
SN - 1944-8244
VL - 11
SP - 13472
EP - 13480
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 14
ER -