TY - JOUR
T1 - Blue OLEDs with narrow bandwidth using CF3 substituted bis((carbazol-9-yl)phenyl)amines as emitters: Structural regulation of linker between donor and acceptor in chromophores
AU - Zhu, Longzhi
AU - Zhang, Hongyang
AU - Peng, Xiao
AU - Zhang, Miao
AU - Zhou, Feifan
AU - Chen, Shuming
AU - Song, Jun
AU - Qu, Junle
AU - Wong, Wai Yeung
N1 - Funding Information:
This work has been partially supported by the National Natural Science Foundation of China ( 61620106016 / 61835009 / 61775145 / 31771584 / 52073242 ); Guangdong Province Key Area R&D Program ( 2019B110233004 ); Shenzhen Basic Research Project ( JCYJ20170818100153423 ); Natural Science Foundation of SZU (No. 2017000193 ). W.-Y.W. would like to thank the Science, Technology and Innovation Committee of Shenzhen Municipality ( JCYJ20180507183413211 ); the Hong Kong Research Grants Council ( PolyU 153058/19P ); Hong Kong Polytechnic University ( 1-ZE1C ), Research Institute for Smart Energy (RISE) and the Endowed Professorship in Energy from Ms. Clarea Au ( 847S ) for financial support.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10
Y1 - 2021/10
N2 - Three new donor-acceptor (D-A) chromophores decorated with bis(trifluoromethyl)-substituted phenyl group as acceptor and bis(4-(9H-carbazol-9-yl)phenyl)amine as donor unit, namely 1,4-naphthyl-CF3 (1), 1,5-naphthyl-CF3 (2) and Ph-CF3 (3), were designed and synthesized. Their photophysical and electrochemical characteristics, and corresponding theoretical calculations were investigated. They showed blue emissions with high photoluminescence quantum yields (PLQY). Doped organic light-emitting diodes (OLEDs) based on them were fabricated, which exhibited strong blue electroluminescence with emission peaks at 453, 446 and 440 nm and full width at half maximum (FWHM) of 69, 65 and 65 nm, respectively. Their Commission International del'Eclairage (CIE) coordinates correspond to (0.169, 0.158), (0.176, 0.134) and (0.163, 0.099). Besides, the maximum current efficiencies (CEs) of 2.8, 5.0 and 4.9 cd A−1; power efficiencies (PEs) of 2.9, 5.4 and 5.2 lm W−1; external quantum efficiencies (EQEs) of 2.3, 2.3 and 3.4% were achieved for 1,4-naphthyl-CF3 (1), 1,5-naphthyl-CF3 (2) and Ph-CF3 (3) doped devices D1, D2 and D3, respectively. This study clearly showed that the optoelectronic properties of these organic small molecules can be regulated by rational design of molecular structures, and their emission wavelengths could be finely tuned within the blue region.
AB - Three new donor-acceptor (D-A) chromophores decorated with bis(trifluoromethyl)-substituted phenyl group as acceptor and bis(4-(9H-carbazol-9-yl)phenyl)amine as donor unit, namely 1,4-naphthyl-CF3 (1), 1,5-naphthyl-CF3 (2) and Ph-CF3 (3), were designed and synthesized. Their photophysical and electrochemical characteristics, and corresponding theoretical calculations were investigated. They showed blue emissions with high photoluminescence quantum yields (PLQY). Doped organic light-emitting diodes (OLEDs) based on them were fabricated, which exhibited strong blue electroluminescence with emission peaks at 453, 446 and 440 nm and full width at half maximum (FWHM) of 69, 65 and 65 nm, respectively. Their Commission International del'Eclairage (CIE) coordinates correspond to (0.169, 0.158), (0.176, 0.134) and (0.163, 0.099). Besides, the maximum current efficiencies (CEs) of 2.8, 5.0 and 4.9 cd A−1; power efficiencies (PEs) of 2.9, 5.4 and 5.2 lm W−1; external quantum efficiencies (EQEs) of 2.3, 2.3 and 3.4% were achieved for 1,4-naphthyl-CF3 (1), 1,5-naphthyl-CF3 (2) and Ph-CF3 (3) doped devices D1, D2 and D3, respectively. This study clearly showed that the optoelectronic properties of these organic small molecules can be regulated by rational design of molecular structures, and their emission wavelengths could be finely tuned within the blue region.
KW - Blue OLEDs
KW - Donor-acceptor structures
KW - Narrow bandwidth
KW - Structural regulation
UR - http://www.scopus.com/inward/record.url?scp=85110358740&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2021.109627
DO - 10.1016/j.dyepig.2021.109627
M3 - Journal article
AN - SCOPUS:85110358740
SN - 0143-7208
VL - 194
JO - Dyes and Pigments
JF - Dyes and Pigments
M1 - 109627
ER -